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Journal articles on the topic 'Energy efficiency heat exchanger'
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1
Rostami, Mohammadreza Hasandust, Gholamhassan Najafi, Ali Motevalli, Nor Azwadi Che Sidik, and Muhammad Arif Harun. "Evaluation and Improvement of Thermal Energy of Heat Exchangers with SWCNT, GQD Nanoparticles and PCM (RT82)." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 79, no. 1 (2020): 153–68. http://dx.doi.org/10.37934/arfmts.79.1.153168.
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Today, due to the reduction of energy resources in the world and its pollutants, energy storage methods and increase the thermal efficiency of various systems are very important. In this research, the thermal efficiency and energy storage of two heat exchangers have been investigated in series using phase change materials (RT82) and single wall carbon nanotubes (SWCNT) and graphene quantum dot nanoparticles (GQD) In this research, two heat exchangers have been used in combination. The first heat exchanger was in charge of storing thermal energy and the second heat exchanger was in charge of heat exchange. The reason for this is to improve the heat exchange of the main exchanger (shell and tube) by using heat storage in the secondary exchanger, which has not been addressed in previous research. The results of this study showed that using two heat exchangers in series, the thermal efficiency of the system has increased. Also, the heat energy storage of the double tube heat exchanger was obtained using phase change materials in the single-walled carbon nanotube composition of about 3000 W. The average thermal efficiency of the two heat exchangers as the series has increased by 52%. In general, the effect of the two heat exchangers on each other was investigated in series with two approaches (energy storage and energy conversion) using fin and nanoparticles, which obtained convincing results.
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Sun, Lin, Biwei Fu, Menghui Wei, and Si Zhang. "Analysis of Enhanced Heat Transfer Characteristics of Coaxial Borehole Heat Exchanger." Processes 10, no. 10 (2022): 2057. http://dx.doi.org/10.3390/pr10102057.
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Coaxial borehole heat exchangers provide a practical method for geothermal energy extraction, but heat transfer efficiency is low. In order to address this problem, three coaxial borehole heat exchangers with vortex generators, based on the enhanced heat transfer theory, are proposed in this paper. The author compared and analyzed the heat transfer performance of three coaxial borehole heat exchangers with vortex generators and those of traditional structures, which explains why the new heat exchanger’s heat transfer mechanism is enhanced. The results demonstrated that the vortex generator can enhance the fluid flow’s turbulent kinetic energy in the coaxial heat exchanger. This generator can also improve the mixing characteristics of the fluid flow and heat transfer. The resultant increase in the inlet flow velocity can decrease the friction coefficient f, increase the Nusselt number and strengthen the coaxial sleeve. As a result, the heat exchange performance of the tubular heat exchanger will also be improved. The thread vortex generator (TVG) heat exchanger outperforms the other three heat exchangers in terms of heat exchange performance, extraction temperature and heat extraction power. The results evidenced that the TVG heat exchanger is better than the smooth tube heat exchanger. The thermal performance coefficient PEC was improved by 1.1 times, and the extraction temperature and heating power were increased by 24.06% and 11.93%, respectively. A solid theoretical foundation is provided by the extracted outcomes for designing and selecting high-efficiency coaxial borehole heat exchangers suitable for geothermal energy extraction.
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Dong, Xiaodong, and Chuanhui Zhu. "Research on the Heat Transfer Performance of Phase Change Heat Storage Heat Exchangers Based on Heat Transfer Optimization." Energies 17, no. 16 (2024): 4150. http://dx.doi.org/10.3390/en17164150.
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Thermal storage technology has received increasing attention under the policy of encouraging the development of renewable energy and new clean energy. Optimizing the heat exchange system of phase change thermal storage heat exchangers to obtain better performance has become increasingly urgent. This study comprehensively investigated the actual process of heat transfer and assessed the heat transfer correlation laws between the heat transfer fluids, heat exchange tubes, fins, and phase change materials. Taking the heat exchange efficiency of the heat exchanger as a guide, a simulation was conducted on the effect of the presence and quantity of fins as well as the flow rate of the cooling liquid on the heat exchange efficiency of the heat exchanger. The simulation results showed that too many or too few fins were not conducive to improving heat transfer efficiency. In addition, no positive correlation was observed between the flow rate of the cooling liquid in the heat exchanger and the heat transfer efficiency of the heat exchanger. Specifically, models with slightly slower cooling liquid flow rates had a higher heat transfer efficiency. After a sensitivity analysis, it was found that the number of fins had a more significant effect on the heat transfer efficiency of the heat exchanger than the flow rate of the cooling liquid. The heat exchanger with five fins and a cooling liquid flow rate of 0.1 m/s demonstrated the best heat transfer effect, achieving a temperature drop of 14.76% within 5 min.
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Ye, Wei. "Energy Efficiency Evaluation of Industrial Heat Exchangers Based on Fuzzy Matter Element Method." Mechanics 26, no. 2 (2020): 171–76. http://dx.doi.org/10.5755/j01.mech.26.2.22848.
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According to the energy consumption status of industrial heat exchanger in the whole life cycle, the energy efficiency evaluation index system of industrial heat exchanger is put forward firstly. Secondly, aiming at the complexity and fuzziness of energy consumption of industrial heat exchanger, the energy efficiency evaluation model of industrial heat exchanger based on fuzzy matter-element method is established by using fuzzy matter-element theory and combining the concept of Hemingway schedule. Finally, taking the shell-and-tube heat exchanger as an example, five shell-and-tube heat exchangers with different designs and materials were selected to analyze their energy consumption advantages and disadvantages. Via calculation and analysis, the optimal energy efficiency design of the shell-and-tube heat exchanger was obtained. At the same time, reference opinions were provided for the design and manufacture of the shell-and-tube heat exchanger.
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Batukhtin, Sergey, Andrey Batukhtin, and Marina Baranovskaya. "Water-air regenerative heat exchanger with increased heat exchange efficiency." E3S Web of Conferences 295 (2021): 04005. http://dx.doi.org/10.1051/e3sconf/202129504005.
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According to experts’ forecasts, by 2040 the global demand for energy will increase by 37%, and renewable energy sources in the next 20 years will become the fastest growing segment of the world energy, their share in the next decade will grow by about one and a half times. Solar energy is the fastest growing industry among all non-conventional energy sources and is gaining the highest rates of development in comparison with other renewable energy sources. In this article, the authors provide an overview of the technologies that increase the efficiency and productivity of solar panels, only the investigated methods are described that can speed up the process of introducing solar energy instead of traditional. All the methods described can increase the efficiency of systems that are based on the use of the sun as the main source of energy. The authors presented and described the scheme of a solar-air thermal power plant, which will improve energy efficiency through the use of a regenerative air solar collector with increased heat transfer efficiency. Strengthening will be achieved through the use of hemispherical depressions on the surface that receives solar radiation. A schematic diagram is given and the principle of operation of such a solar collector is described in detail. A comparative calculation of the intensification of the solar collector with the use of depressions and without the use as modernization was carried out, on the basis of which a conclusion was made about the efficiency of using this type of solar collector and the economic effect from the application of this method. A description of the method for calculating the solar collector is given, thanks to which this development can be used and implemented in existing heating and hot water supply systems.
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Pulin, Anton, Mikhail Laptev, Nikolay Kortikov, et al. "Numerical Investigation of Heat Transfer Intensification Using Lattice Structures in Heat Exchangers." Energies 17, no. 13 (2024): 3333. http://dx.doi.org/10.3390/en17133333.
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Heat exchangers make it possible to utilize energy efficiently, reducing the cost of energy production or consumption. For example, they can be used to improve the efficiency of gas turbines. Improving the efficiency of a heat exchanger directly affects the efficiency of the device for which it is used. One of the most effective ways to intensify heat exchange in a heat exchanger without a significant increase in mass-dimensional characteristics and changes in the input parameters of the flows is the introduction of turbulators into the heat exchangers. This article investigates the increase in efficiency of heat exchanger apparatuses by introducing turbulent lattice structures manufactured with the use of additive technologies into their design. The study is carried out by numerical modeling of the heat transfer process for two sections of the heat exchanger: with and without the lattice structure inside. It was found that lattice structures intensify the heat exchange by creating vortex flow structures, as well as by increasing the heat exchange area. Thus, the ratio of convection in thermal conductivity increases to 3.03 times. Also in the article, a comparative analysis of the results obtained with the results of heat transfer intensification using classical flow turbulators is carried out. According to the results of the analysis, it was determined that the investigated turbulators are more effective than classical ones, however, the pressure losses in the investigated turbulators are much higher.
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Nasibullina, O. A., and D. D. Kasintseva. "Study of the effect of the annular gap between the kta housing and the transverse segment partitions on the heat exchange efficiency." Journal of Physics: Conference Series 2373, no. 5 (2022): 052032. http://dx.doi.org/10.1088/1742-6596/2373/5/052032.
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Abstract In modern industry, specially designed devices, called heat exchangers, are used to carry out heat exchange between working bodies (heat exchangers). They are widely used in all industries (chemical, oil and gas, food, etc.), which is due to the high reliability of the design, high productivity, simplicity of design and a variety of types and designs. The objective of the investigation is to simulate heat exchange in a shell-and-tube heat exchanger without an annular gap between the housing and segment transverse partitions and with a gap equal to 6 mm, and then determine at which of these two gaps the heat exchanger thermal efficiency is highest. The simulation was performed in ANSYS Workbench. The comparison of the energy efficiency of the apparatus was made using the Kirpichev criterion. This criterion is quite simple and does not require finding a large number of various parameters. With this criterion, it is possible to determine in which case the heat exchanger will be most advantageous in terms of energy efficiency.
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Liu, Yadan, Shaohua Chen, Caiyu Zhang, Hui Ma, Na Li, and Juan Bai. "Power disassembly equipment for high efficiency heat transfer plate heat exchangers." Thermal Science 28, no. 2 Part B (2024): 1431–39. http://dx.doi.org/10.2298/tsci2402431l.
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Plate heat exchangers are realized by means of a heat transfer mechanism, in which heat is naturally transferred from the hot substance to the object with a lower temperature according to the laws of thermodynamics. Two liquids of different temperatures flow on the wall, heat transfer on the wall and convection of the liquid on the wall, thus promoting heat transfer between the two liquids. Under the same flow rate and power consumption conditions, its heat transfer coefficient is three times that of shell and tube heat exchangers, which is a key and efficient new equipment for effectively using effective resources and saving and developing new energy. However the heat supply plate heat exchanger has a tiny circulation surface and is easily obstructed. Regular maintenance and cleaning, troubleshooting, and plate replacement all necessitate frequent heat exchanger disassembly and installation. The requirements and challenges in dismantling and assembling the heat exchanger are very high, and manual disassembly is wasteful, making consistent force difficult to achieve. The current methods of disassembly and assembly are inefficient and incorrect. The intelligent mechanization of disassembly and assembly equipment is realized in this paper by driving, clamping, automatic control, distance measurement, sensing, and other systems. The problems of uneven force, low efficiency, and precision in plate heat exchanger disassembly and assembly are solved. Our power disassembly equipment for high efficiency heat transfer plate heat exchangers not only enhances disassembly efficiency and precision, but it also ensures the safe operation of the plate heat exchanger heating system, and the heat transfer efficiency and heat exchange efficiency are improved. Furthermore, it has a wide range of applications in the petroleum, chemical, and other industries.
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SHEVKUN, NIKOLAY A. "Heat recovery plant: ways to improve energy efficiency." Agricultural Engineering, no. 6 (2023): 4–9. http://dx.doi.org/10.26897/2687-1149-2023-6-4-9.
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One of the ways to reduce the cost of heating production facilities in animal husbandry is the use of regenerative heat recovery plants. However, the existing designs of heat exchangers have a number of design flaws affecting their functionality, in particular, the uneven distribution of the air flow over the surface of a heat exchanger. This, in turn, does not provide for a more complete utilization of exhaust air heat. Using the example of a recuperative heat recovery unit UT‑3000, the authors consider the possibility of retrofitting it with an aerodynamic grid to evenly distribute the exhaust air flow over the heat exchanger surface and reduce energy costs for its operation. To do this, they analyzed the applicability of the aerodynamic grid. The size of a blade chord was taken into account as an optimisation parameter. The pressure losses calculated on the “fan - pallet - heat exchanger” section showed that the use of an aerodynamic grid with a “normal” number of blades would create a minimum airflow pressure loss of 0.73 Pa minimum airflow pressure loss of 0.73 Pa, which is 58% less than in the version without an aerodynamic grid. Further experimental study of the uniform airflow distribution over the heat exchanger surface aimed at improving the energy efficiency of the heat recovery unit requires a new design of a heat exchanger with an aerodynamic grid, taking into account the recommended range of “normal” number of blades from 16 to 21, the blade circumference arc of 95° and the blade pitch angle ranging between 68 and 82°.
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Benyoub, Mohammed, Benaoumeur Aour, Abdellatif Oudrane, and Kaddour Sadek. "Numerical Investigation of the Coaxial Geothermal Heat Exchanger Performance." International Journal of Engineering Research in Africa 69 (May 21, 2024): 71–90. http://dx.doi.org/10.4028/p-6ovlez.
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Space heating and cooling using geothermal heat exchangers is a promising environmentally friendly green energy solution. Modeling these energy storage systems is crucial for optimizing their design and operation. In this context, the present study consists of numerically investigating the effects of various physical properties, including thermal conductivity, density, and specific heat capacity of each material, as well as flow velocity, on the process of heat transfer in vertical geothermal heat exchangers using coaxial pipes to optimize their energy performance. Numerical simulations were carried out using Gambit-Fluent software. Different materials that make up the coaxial heat exchanger structure studied were tested to highlight their effects on the progress of heat flux and temperature. Thermal and fluid mechanics aspects were also studied. At the end of this study, a comparative analysis was carried out using the U-tube geothermal heat exchanger. The results indicate that the heat exchanger using a coaxial tube demonstrates superior thermal efficiency compared to the U-tube configuration. It has been found that using a low velocity with an appropriate selection of tube, grout, and soil materials results in enhanced dynamic exchanges, thereby enhancing the thermal efficiency of the geothermal exchanger.
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Sun, Yong, Yiwei Yang, Jing Chen, Keli Xue, and Min Li. "Study on the optimization of heating exchanger in electric heating solid energy storage heating system." Journal of Computational Methods in Sciences and Engineering 24, no. 3 (2024): 1283–302. http://dx.doi.org/10.3233/jcm-247137.
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This paper addresses prevalent issues of suboptimal compatibility between the heating exchanger and the thermal storage unit, poor safety performance, and overall insufficient heat exchange efficiency within the application of heating exchangers in electric heating solid energy storage heating systems. Experimental testing and numerical simulation studies were conducted. The research investigates the effect of the temperature of inlet air as well as velocity on the heat exchange performance of the heating exchanger as well as temperature variations of single-row heat pipes. Drawing upon these change patterns, an optimized heating exchanger structure is proposed and subsequently investigated through optimization simulation studies. The study results indicate that the best overall optimization effect is achieved with a heating exchanger arranged with finned tube combinations of 4 mm in two rows, 6 mm in two rows, 8 mm in two rows, 10 mm in two rows, 12 mm in two rows, and 14 mm in ten rows arranged successively from front to back. When the heating exchanger’s inlet air speed is relatively high, this combination’s heat exchange capacity surpasses the original structure. Additionally, the uniformity of air-side temperature drop improved by 44.89%, while the finned area was reduced by 25.62%.
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Liu, Yongqi, Xiaoling Luo, Shichao Sun, and Dongmei Gao. "Research Progress and Application Prospect Of Microchannel Heat Exchangers." Advances in Computer and Engineering Technology Research 1, no. 4 (2024): 24. https://doi.org/10.61935/acetr.4.1.2024.p24.
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A Micro-channel heat exchanger gradually replaces traditional heat exchanger with the advantages of high heat exchange efficiency, fast heating speed, good controllability, low noise, stable operation, good pressure bearing capacity and cost saving. The thesis summarizes the research progress and development prospects of the microchannel heat exchanger.Summarized and elaborated on the unparalleled advantages of microchannel heat exchangers compared to conventional sized equipment which is compared with the regular size equipment. Moreover application fields and prospects of the microchannel heat exchanger are analyzed from the point of energy saving and space occupancy．The thesis has some reference value for the research of micro heat exchangers.
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Adamovský, D., P. Neuberger, D. Herák, and R. Adamovský. "Exergy of heat flows in exchanger consisting f gravity heat pipes." Research in Agricultural Engineering 51, No. 3 (2012): 73–78. http://dx.doi.org/10.17221/4906-rae.
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The paper deals with the analysis of the impact of inlet air temperature on the exergy efficiency and exergy of the losing heat flow and determination of the relation between the exergy and thermal efficiency in an exchanger consisting of gravity heat pipes. The assessment of heat processes quality and transformation of energy in the exchanger are also dealt with.
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Dou, Jie, and Fude Wang. "Simulation study on optimization design of small gas water heat exchangers." Journal of Physics: Conference Series 2835, no. 1 (2024): 012070. http://dx.doi.org/10.1088/1742-6596/2835/1/012070.
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Abstract Gas water heat exchangers are widely used and indispensable in solar heating and hot water engineering. The high-efficiency and energy-saving of heat exchangers is a development trend. This article studies small gas-water heat exchangers and designs and improves the structure of the heat exchanger. We simulate the airflow situation of the heat exchanger and further optimize the small gas-water heat exchanger based on simulation data to improve its operating conditions, thereby improving heat transfer efficiency, reducing wear, and increasing service life.
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Liu, Yin, Jing Ma, Guang-Hui Zhou, and Ren-Bo Guan. "Experimental research on heat transfer in a coupled heat exchanger." Thermal Science 17, no. 5 (2013): 1437–41. http://dx.doi.org/10.2298/tsci1305437l.
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The heat exchanger is a devise used for transferring thermal energy between two or more different temperatures. The widespreadly used heat exchanger can only achieve heat exchange between two substances. In this paper, a coupled heat exchanger is proposed, which includes a finned heat exchanger and a double pipe heat exchanger, for multiple heat exchange simultaneously. An experiment is conducted, showing that the average heating capacity increases more than 35%, and the average heating efficiency increases more than 55%, compared with the ordinary air-source heat pump.
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Du, Ruiqing, Dandan Jiang, and Yong Wang. "Numerical Investigation of the Effect of Nanoparticle Diameter and Sphericity on the Thermal Performance of Geothermal Heat Exchanger Using Nanofluid as Heat Transfer Fluid." Energies 13, no. 7 (2020): 1653. http://dx.doi.org/10.3390/en13071653.
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The geothermal heat exchanger system is one of the most energy-efficient and environmentally friendly building service systems. In the present study, CuO/water nanofluid was used as the heat transfer fluid to enhance the energy efficiency of the geothermal heat exchangers. A three-dimensional numerical model was employed to investigate the effect of nanoparticle diameter and sphericity on the thermal performance of the geothermal heat exchanger, and it was well validated against the experimental results of nanofluids in the geothermal heat exchangers. The numerical results showed that nanoparticles with a diameter of 5 nm and 50 nm were not recommended for the nanofluids used in the geothermal heat exchangers due to the performance efficiency coefficient lower than 1, and the optimum diameter was 40 nm, which had the highest performance efficiency coefficient (1.004875). Moreover, the spherical particle-based nanofluid was characterized by the 8.55% higher energy efficiency, in comparison to rod-shaped particle-based nanofluid. Therefore, the application of nanofluid in the geothermal heat exchanger can enhance heat transfer, and the proposed optimum particle diameter and sphericity could contribute to higher energy efficiency.
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Li, Jie, Yong Hong Zhu, and Sun Jian. "Efficiency and Economy Research of a Tunnel Kiln's Flue Gas Heat Exchanger." Advanced Materials Research 834-836 (October 2013): 1967–71. http://dx.doi.org/10.4028/www.scientific.net/amr.834-836.1967.
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In order to obtain efficiency and economy of a ceramic tunnel kiln’s flue gas heat exchanger, firstly, the exchanger’s sizes and thermal parameters on operative conditions were measured. Secondly, flow field and temperature field in the operative exchanger were numerically simulated by using FLUENT, a computational fluid dynamics soft ware. Finally, on base of the simulation, the exchanger’s efficiency and economy were calculated. The calculation results are listed as the following: (1) Energy savings in per unit time for utilizing the heat exchanger to recycle and reuse the flue gas’s waste heat is 112.2kW. (2) Efficiency of the heat exchanger equals 77%.
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Soundararajan, Srinath, and Mahalingam Selvaraj. "Investigations of protracted finned double pipe heat exchanger system for waste heat recovery from diesel engine exhaust." Thermal Science, no. 00 (2023): 143. http://dx.doi.org/10.2298/tsci230212143s.
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The need for energy and material savings, as well as environmental concerns, have helped to increase the demand for high-efficiency heat exchangers in the modern era. In practice, a heat exchanger or the direct ejection of the hot working fluid is used to recover the waste heat from a heat engine or thermal power plant into the environment. Waste heat of a heat engine or power plant is recovered to the environment via a heat exchanger or by direct ejection from the hot working fluid. In many situations, waste heat recovery removes or greatly reduces the necessity for additional fuel energy input to achieve this goal. The double pipe heat exchanger equipment is taken in this research, heat from engine exhaust recovers due to its superior qualities. The design characteristics of the heat pipe will be changed in order to increase overall efficiency by studying the concepts of various authors. Different design parameters for a double pipe heat exchange system as well as different working fluid flow rates are tested with the suggested device. Additionally, ANSYS performs computational fluid dynamics for the proposed heat exchanger system in order for the results to support the experimental findings.
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Chung, Yi-Cheng, and Chun-I. Wu. "Efficiency Enhancement in Ocean Thermal Energy Conversion: A Comparative Study of Heat Exchanger Designs for Bi2Te3-Based Thermoelectric Generators." Materials 17, no. 3 (2024): 714. http://dx.doi.org/10.3390/ma17030714.
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This research focuses on enhancing the efficiency of Bi2Te3-based thermoelectric generators (TEGs) in ocean thermal energy conversion (OTEC) systems through innovative heat exchanger designs. Our comparative study uses computer simulations to evaluate three types of heat exchangers: cavity, plate-fins, and longitudinal vortex generators (LVGs). We analyze their impact on thermoelectric conversion performance, considering the thermal energy transfer from warm surface seawater to TEGs. The results demonstrate that heat exchangers with plate-fins and LVGs significantly outperform the cavity heat exchanger regarding thermal energy transfer efficiency. Specifically, plate-fins increase TEG output power by approximately 22.92% and enhance thermoelectric conversion efficiency by 38.20%. Similarly, LVGs lead to a 13.02% increase in output power and a 16.83% improvement in conversion efficiency. These advancements are contingent upon specific conditions such as seawater flow rates, fin heights, LVG tilt angles, and locations. The study underscores the importance of optimizing heat exchanger designs in OTEC systems, balancing enhanced heat transfer against the required pump power. Our findings contribute to a broader understanding of materials science in sustainable energy technologies.
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Cheng, Junwen, Wenming Cheng, Wei Lin, and Jiuyang Yu. "Heat Transfer Performance and Flow Characteristics of Helical Baffle–Corrugated Tube Heat Exchanger." Applied Sciences 14, no. 19 (2024): 8905. http://dx.doi.org/10.3390/app14198905.
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Heat exchangers are widely used in petrochemical and other industries. Improving the efficiency of heat exchangers to increase energy utilization is crucial. Passive enhanced heat transfer technology is widely studied in heat exchanger research due to its low energy consumption and simple operation. Helical baffle–corrugated tube heat exchangers have not been extensively studied as a promising new class of these devices. This paper investigates the key structural parameters of a helical baffle-corrugated heat exchanger through numerical simulation. This study focuses on the factors affecting heat transfer and flow resistance performance. The results show that reducing the helical angle from 28.42° to 10.81° increases the total heat transfer coefficient by approximately 20%. The overall performance of the heat exchanger is evaluated using the efficiency evaluation coefficient (EEC). Optimal levels of each structural factor are determined for different working conditions based on this evaluation.
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S Chalimah, I Maulana, R Setyobudi, et al. "Analysis of Efficiency and Heat Transfer Coefficient in the Performance Evaluation of Shell and Tube Heat Exchanger." BIOMEJ 4, no. 2 (2024): 1–9. https://doi.org/10.33005/biomej.v4i2.129.
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Heat transfer is the process of energy transfer from a region of higher temperature to a region of lower temperature, occurring through conduction, convection, and radiation mechanisms. Understanding heat transfer is crucial in various industrial and thermodynamic applications. One commonly used device in this process is the heat exchanger, which allows heat transfer between two fluids with different temperatures without direct mixing. This research aims to evaluate the heat transfer phenomena in heat exchangers and their performance under various operational conditions. The study measured the average temperature difference, kinematic viscosity, Reynolds number, fluid velocity, heat exchanger efficiency, the average heat released and received, and the heat transfer coefficient. The results showed a high heat exchanger efficiency, with an average value of 99.53%. The heat transfer coefficient also showed significant values, varying based on fluid flow type and operational conditions. This study emphasizes the importance of selecting the appropriate type and design of heat exchanger to improve thermal system efficiency and reduce energy consumption.
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Grysa, Krzysztof, Artur Maciąg, and Artur Ściana. "Comparison of the Efficiency of Cross-Flow Plate Heat Exchangers Made of Varied Materials." Energies 15, no. 22 (2022): 8425. http://dx.doi.org/10.3390/en15228425.
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This paper discusses a mathematical model for airflow through a cross-flow plate heat exchanger. The exhaust air is used to heat the supply air. Three kinds of plates are considered: made of aluminium, copper, and steel. The purpose of this research was to verify which material used to build the plate heat exchangers uses the exhaust air heat more efficiently. The method of the Trefftz function was used to determine approximate solutions to the analysed problem. The results obtained for 1.2 mm-thick plates and for external winter, summer, and spring–autumn temperatures are discussed. The results indicate that if the efficiency and price of the metals are considered, then steel is the best material for the plate heat exchanger. Thanks to the use of thin steel plates and the reduction in air exchange time to a few minutes, a cheap and efficient cross-flow heat exchanger can be obtained.
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Jayesh, V. Bute, and Dr.S.H.Mankar. "Effect of varying inlet water temperature on performance of three pass helical coil heat exchanger." Journal of Thermal Energy Systems 4, no. 2 (2019): 1–6. https://doi.org/10.5281/zenodo.3233485.
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The straight tube heat exchanger is used mostly in industries such as evaporator or condenser for chemical industry and cooling fluid system. The straight tube heat exchanger consumes more space but offers lesser surface area of contact. This type of heat exchanger provides only one type of flow in single pass. Now there is need of such type of heat exchanger which increases the effectiveness with saving in cost. To improve the efficiency of heat exchanger one must think of heat transfer enhancement in heat exchanger which can help to minimize the problems associated with conventional heat exchangers in near future. Energy and material saving considerations as well as environmental challenges in the industry have increased the demand of New Design for high efficiency heat exchanger. To improve the efficiency of heat exchanger we must think of heat transfer enhancement in heat exchanger.Helical coil heat exchangers are one of the most commonly found equipment in many industry.The helical coil heat exchangers can be made in the form of a cylindrical or shell and tube heat exchangers and it be used for several industrial applications such as power plant, nuclear power plant sector, food process industry, waste heat recovery systems, HVAC industry etc. Helical coil Configuration is very efficient for heat exchangers design because it can accommodate a large heat area for heat transfer in a small space, with high heat transfer coefficients of performance. Heat Transfer Coefficient always increases in helical coil heat exchanger configuration due to centrifugal force generated in it.
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Grysa, Krzysztof, Artur Maciąg, and Artur Ściana. "Comparison of the Efficiency of Two Types of Heat Exchangers with Parallel Plates Made of Varied Materials." Energies 14, no. 24 (2021): 8562. http://dx.doi.org/10.3390/en14248562.
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The paper discusses two mathematical models for the air flow through a plate heat exchanger with parallel plates. The first exhausts the used air and then supplies the fresh air. The second exhausts the used air above the plate and simultaneously supplies fresh air under it (counter-flow exchanger). In both cases, the exhaust air heat is used to heat the supply air. The purpose of the research is to verify which exchanger uses the exhaust air heat more efficiently. The method of the Trefftz function was used to determine approximate solutions of the analysed problems. The results obtained for 1.2 mm thick steel, aluminium, and copper plates and for external winter, summer, and spring–autumn temperatures are discussed. The results indicate that steel is the best material for a plate heat exchanger, and the counter-flow exchanger is more efficient of the two. Thanks to the use of thin steel plates and the reduction of the air exchange time to a few minutes, cheap and efficient counter-flow exchangers can be obtained.
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Chen, Cheng-You, Kung-Wen Du, Yi-Cheng Chung, and Chun-I. Wu. "Advancements in Thermoelectric Generator Design: Exploring Heat Exchanger Efficiency and Material Properties." Energies 17, no. 2 (2024): 453. http://dx.doi.org/10.3390/en17020453.
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This paper presents a comprehensive study on the application and optimization of automotive thermoelectric generators (ATEGs), focusing on the crucial role of heat exchangers in enhancing energy conversion efficiency. Recognizing the substantial waste of thermal energy in internal combustion engines, our research delves into the potential of TEGs to convert engine waste heat into electrical energy, thereby improving fuel efficiency and reducing environmental impact. We meticulously analyze various heat exchanger designs, assessing their influence on the TEG’s output power under different exhaust gas flow rates and temperatures. Furthermore, we explore the impact of TEG material properties on the overall energy conversion effectiveness. Our findings reveal that specific heat exchanger designs significantly enhance the efficiency of waste gas heat exchange, leading to an improved performance of the TEG system. We also highlight the importance of thermal insulation in maximizing TEG output. This study not only contributes to the ongoing efforts to develop more sustainable and efficient vehicles but also provides valuable insights into the practical application of thermoelectric technology in automotive engineering. Through this research, we aim to pave the way for more environmentally friendly transportation solutions, aligning with global efforts to reduce fossil fuel dependence and mitigate environmental pollution.
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Seryam, Udit, Aseem C. Tiwari, and Jeetendra Kushwaha. "Comparative Experimental Study on Effect of Copper Wire Helical Wound Steel Tube with 2.5” Full Length Insert on Performance of Double Pipe Steel Tube Heat Exchanger." International Journal for Research in Applied Science and Engineering Technology 11, no. 8 (2023): 306–19. http://dx.doi.org/10.22214/ijraset.2023.55198.
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Abstract: A comparative experimental study was conducted to explore the hydrothermal behavior of a double tube heat exchanger with copper wire helical wound steel tubes and plane steel tubes with and without twisted tap inserts of pitch length 2.5 inches. In comparison to helical tubes, corrugated tubes, and many other more compact tube type heat exchangers, straight tube heat exchangers offer advantages since the construction of the heat exchanger tubes is easier. In the current work, the fluid-to-fluid heat exchange is considered, with a flow rate ranging from 15 to 75 liters/hour. Constant wall temperature or constant heat flux ideas are used in the majority of investigations on heat transfer coefficients. The efficiency, overall heat transfer coefficient, and impact of hot water flow rate with constant cold water flow rate for straight steel tube and copper wire helical wrapped steel tube heat exchangers in parallel flow and counter flow configurations were investigated and compared. Utilizing a 2.5" full length clockwise twisted tape insert, both layouts were created. The measurements were carried out in a constant state. When the hot water flow rate is increased while maintaining the cold water flow rate constant, the efficiency of the heat exchanger drops for both the straight steel and the copper wire helical wound steel tube. Compared to a plane steel tube heat exchanger, the copper wire helical wound steel tube heat exchanger has a better efficiency. The test findings demonstrate that inserting inserts causes pressure drop. With 2.5" clockwise twisted tape inserts wrapped in helical copper wire, steel tube was able to transmit heat more quickly than other arrangements.
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Matuszczak, Mikołaj, and Sławomir Pietrowicz. "An Experimental Investigation of Increasing the Thermal Efficiency of a Finned Tube Heat Exchanger by Using the Chimney Effect." Energies 15, no. 19 (2022): 7310. http://dx.doi.org/10.3390/en15197310.
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In the paper, experimental analyses of the free convection heating transfer in a flat wavy-fin heat exchanger with the dimensions of 500 × 500 mm were investigated. The experimental reserch mainly included determining the average heat flux and heat-transfer coefficient for two selected types of finned heat exchangers. First, tests were conducted for exchangers without considering the so-called ’chimney’ effect; these tests will be treated as reference studies. Then, experiments for specially designed ’chimneys’ over the exchanger with heights of 350, 850, and 1350 mm, respectively, were carried out again. The analyses were performed for an average temperature difference between the heat-exchange surface and the environment in the range of 18 to 55 K. The experimental results demonstrated that, compared to the exchanger without a chimney, the addition of a chimney significantly affects the improvement in the thermal performance of the heat exchanger under natural convection conditions. Regarding the variant without a chimney, when a chimney is used with the highest height of 1350 mm and a maximum temperature difference of 55 K, the average heat flux increases by approximately 450% and the average heat-transfer coefficient is approximately 10 times higher. The heat exchanger characterised by lower airflow resistance showed higher values of average heat flux of 5 to 45% in the Rayleigh number range of 25 to 180. Studies have indicated that in some cases, a simple modification of the geometry of the heat exchanger leads to significant improvements in thermal performance and, in extreme cases, to the elimination of supporting equipment such as fans.
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Su, Siyuan. "Application of building equipment intelligent management and control system in renewable energy thermal energy modelling." Thermal Science 27, no. 2 Part A (2023): 1075–82. http://dx.doi.org/10.2298/tsci2302075s.
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In order to solve the dynamic characteristics of fuel cell thermal energy in building equipment intelligent control system, this paper proposes the application research of building equipment intelligent control system in renewable energy thermal energy modelling. A cold water proton exchange membrane fuel cell cogeneration scheme was proposed. The heat produced by the installation is carried out by the cooling system, and the heat is exchanged between the heat exchanger and the hot water always heated in the heat exchanger. At the same time, a water tank is used to store hot water for heat recovery. Based on MATLsimulation coupling software platform, the simulation model of fuel cell cogeneration system was es?tablished, including reactor model, power system model, heat exchanger model, etc. The simulation model of fuel cell cogeneration system was built up, including the reactor model, power system model, and so on. The experimental results show that the system can achieve good response performance and anti-disturbance by using fuzzy PID controller to control and simulate the system. At the same time, the simulation results show that the optimal efficiency of the system in the power load is about 83%. In conclusion, it can meet the modern family?s thermal power demands and improve the power consumption.
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Wu, Zhiwei, and Caifu Qian. "Study on Behavior of the Heat Exchanger with Conically-Corrugated Tubes and HDD Baffles." ChemEngineering 6, no. 1 (2022): 1. http://dx.doi.org/10.3390/chemengineering6010001.
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Baffles with holes in different diameters (or HDD baffles) and conically-corrugated tubes are respectively longitudinal flow baffle and high-efficiency heat exchange tubes proposed by the author. In this paper, vibrations of tube bundles with HDD baffles and fluid flow as well as heat transfer inside conically-corrugated tubes were numerically simulated, and the heat exchanger with conically-corrugated tubes and HDD baffles was tested for the heat transfer efficiency. It is found that compared with the traditional segmental baffles, tube bundle vibrations in heat exchangers, if using the HDD baffles, can be significantly reduced. Regarding heat transfer efficiency, conically-corrugated tubes are much better than smooth tubes and even better than other high-efficiency heat transfer tubes. Compared with the traditional heat exchangers, heat exchangers constructed with conically-corrugated tubes and the HDD baffles can provide better heat transfer efficiency and less tube bundle vibration.
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Bai, Yike, Yi Yao, and Shouqing Zheng. "Design and Analysis of Heat Pipe Heat Exchanger Efficiency." Bulletin of Science and Practice, no. 6 (June 15, 2023): 373–80. http://dx.doi.org/10.33619/2414-2948/91/44.
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The heat pipe has a high thermal conductivity, and its basic working principle is to transfer heat through evaporation and condensation through the working medium inside the pipe. Heat pipe has good thermal conductivity, isotherm and other characteristics, and the heat transfer area at both ends can be changed at will, control the temperature and other advantages. Therefore, the heat pipe heat exchanger has the advantages of high heat transfer efficiency, compact structure, small fluid resistance loss, and beneficial to control dew point corrosion. At present, it has been widely used in metallurgy, chemical industry, oil refining, boiler, ceramics, transportation, light textile, machinery and other industries, as energy saving equipment for waste heat recovery and heat energy utilization in the process, and has achieved remarkable economic benefits. The design of the heat pipe heat exchanger on the development of the current situation, development trend, application, design principle and design process of a simple description, while focusing on the discussion of the heat pipe heat exchanger design process. The main content of the heat exchanger thermodynamic calculation, structural design and material selection. The model of heat pipe heat exchanger is established according to the actual situation and the calculated data.
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Łuczak, Rafał, Bogusław Ptaszyński, Zbigniew Kuczera, and Piotr Życzkowski. "Energy efficiency of ground-air heat exchanger in the ventilation and airconditioning systems." E3S Web of Conferences 46 (2018): 00015. http://dx.doi.org/10.1051/e3sconf/20184600015.
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In the article, analysis of heat exchangers, working together with air-conditioning system, are presented. For an object with known requirement to hot and cold, air heat exchanger (ground type) is designed. For that defined system, the energy analysis of heat exchanger’s energy work in yearly cycle, including a work of air treatment with full (cooling - desiccation and heating of air in the summer, heating and moisturizing in the winter) and not quite full (cooling of air in the summer, heating of air in the winter) air-conditioning are examined. Effects connected with a reduction of energy costs needed for heat treatment of air blown to the room are specified included the climatic conditions like air heating and cooling degree-hours.
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Li, Qiong, Yong Sheng Niu, Yi Xiang Sun, and Zhe Liu. "Heat and Mass Transfer Analysis of Mine Exhaust Air Heat Exchanger." Advanced Materials Research 765-767 (September 2013): 3018–22. http://dx.doi.org/10.4028/www.scientific.net/amr.765-767.3018.
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As a good energy resource, Mine exhaust air has an important value of recycling. In this paper, the heat and mass exchange mechanism and potential of the mine exhaust air heat exchanger (MEAHE) is mainly researched. The heat exchanger efficiency is affected by water and air temperature and flow in terms of double efficiency method. The result can provide the basis for the further determine the thermal calculation method for MEAHE, and lays the foundation for the mine comprehensive utilization of waste heat recovery system design.
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Wang, Fang, Yunding Li, Mengwei Liu, et al. "Comprehensive Evaluation of the Performances of Heat Exchangers with Aluminum and Copper Finned Tubes." International Journal of Chemical Engineering 2023 (December 20, 2023): 1–11. http://dx.doi.org/10.1155/2023/6666947.
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The finned-tube heat exchanger is the core part of an air conditioning system. Its heat exchange performance directly affects the energy consumption and efficiency of the air conditioner. The shortage and rising price of copper have led to increasing replacement of copper tubes with aluminum tubes in finned-tube heat exchangers. This paper studies two kinds of such heat exchangers, one consisting of copper tubes and aluminum fins and the other consisting of aluminum tubes and aluminum fins. The influences of the different base tube materials on heat transfer are compared and analyzed in terms of heat transfer strength and cost per unit heat transfer. The results show that the heat transfer and heat transfer coefficient increase with increasing inlet wind speed. Under different inlet wind speeds, the heat transfer and heat transfer coefficient of the finned-tube heat exchanger with aluminum tubes are 4%–12% and 7%%–9% lower than those of an identically structured heat exchanger with copper tubes, respectively. The aluminum-aluminum exchanger achieves 67% higher heat transfer than that of the copper-aluminum exchanger at only 8% of the cost. These results are significant for guiding the development and application of finned-tube heat exchangers.
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Wu, Zhao-Chun, and Xiang-Ping Zhu. "Comparison of heat transfer efficiency between heat pipe and tube bundles heat exchanger." Thermal Science 19, no. 4 (2015): 1397–402. http://dx.doi.org/10.2298/tsci1504397w.
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A comparison of heat transfer efficiency between the heat pipe and tube bundles heat exchanger is made based on heat transfer principle and the analysis of thermal characteristics. This paper argues that although heat pipe has the feature of high axial thermal conductivity, to those cases where this special function of heat transfer is unnecessary, heat pipe exchanger is not a high efficient heat exchanger when it is just used as a conventional heat exchanger in the industrial fields. In turn, there are some deficiencies for heat pipe exchanger, such as complicated manufacturing process, critical requirements for manufacturing materials, etc. which leads to a higher cost in comparison to a tubular heat exchanger. Nonetheless, due to its diverse structural features and extraordinary properties, heat pipe exchanger still has wide applications on special occasions.
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Bai, Zhenpeng, Yanfeng Li, Jin Zhang, Alan Fewkes, and Hua Zhong. "Research on the design and application of capillary heat exchangers for heat pumps in coastal areas." Building Services Engineering Research and Technology 42, no. 3 (2021): 333–48. http://dx.doi.org/10.1177/01436244211001497.
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This study investigated the optimal design of a capillary heat exchanger device for the heat pump system and its innovative engineering application in a building. The overall aim was to use a capillary heat exchanger to obtain energy in coastal areas for promoting renewable energy in low-carbon building design. Initially, the main factors affecting the efficiency of the capillary heat exchanger were identified, a mathematical model was then established to analyse the heat transfer process. The analysis showed the flow rate and the capillary length are the key factors affecting the efficiency of the capillary heat exchanger. Secondly, to optimize the structural design of the capillary heat exchanger, the heat energy transfer is calculated with different lengths of the capillary under various flow rates in summer and winter conditions, respectively. Thirdly, a typical building is selected to analyse the application of the capillary heat exchanger for extracting energy in the coastal area. The results show the performance of the selected capillary heat exchanger heat pump system, in winter, the heat energy transfer rate is 60 W/m2 when the seawater temperature is 3.7 °C; in summer, the heat energy transfer rate is 150 W/m2 when the seawater temperature is 24.6 °C. Finally, the above field test results were examined using a numerical simulation model, the test and simulation results agree with each other quite well. This paper is conducive in promoting the development of the capillary heat exchanger heat pump as an innovative sustainable technology for net-zero energy and low carbon buildings using renewable energy in coastal areas. Practical application: A recently proposed capillary heat exchanger is used as an energy extraction and utilisation device to obtain energy in coastal areas for promoting renewable energy in low-carbon building design. This paper explores the application of a capillary heat exchanger as both cold and heat sources for application in typical low-rise buildings. The analysis of the heat energy transfer rate of a typical low-rise building located in a coastal area in summer and winter provides guidance for the application of capillary heat exchangers.
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Hua, Hong Jian, Abudulkareem Sh Mahdi Al-Obaidi, Chin Wai Meng, and Kenny James Ling Neng Hui. "Effect of Supply and Exhaust Air Velocity on the Enthalpy and Temperature Exchange Efficiency of a Paper Heat Exchanger." MATEC Web of Conferences 335 (2021): 03006. http://dx.doi.org/10.1051/matecconf/202133503006.
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Heat Recovery Ventilators (HRV) are gradually becoming more popular in urban cities and buildings as it is able to effectively maintain the indoor air quality while also using minimal amounts of energy. The key component in the HRV is the Paper Heat Exchanger, which allows the heat exchange of indoor and outdoor air through a crossflow, while also filtering out stale air and dust particles. This article investigates the effect of manipulating the supply and exhaust air velocity on the enthalpy and temperature exchange efficiency of a paper heat exchanger. Data is obtained from experimental results, where the experiments are conducted in a test lab using heat recovery ventilators (HRV) installed with paper heat exchangers. Two paper heat exchangers from different suppliers were tested inside a HRV installed in an air conditioned room. The HRV fan speed was varied at a fixed interval of 0.5 m/s, and the air velocity was measured by using a wind speed meter. At the same time, a USB data logger was used to collect relative humidity and temperature of the air at the supply inlet, indoor air inlet, and return air outlet to determine temperature exchange efficiency and the enthalpy of air. The results of the testing shows that the HRV was able to achieve a temperature exchange efficiency of 47 to 63% and enthalpy exchange efficiency of 63 to 94% for PHEX-A, and a temperature exchange efficiency of 28 to 48% and enthalpy exchange efficiency of 57 to 85% for PHEX-B. The data shows that PHEX-A has higher efficiency than PHEX-B.
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Kaminski, Kazimierz, Pawel Znaczko, Ewa Kardas-Cinal, Norbert Chamier-Gliszczynski, Krzysztof Koscielny, and Krzysztof Cur. "Comparison of the Heat Transfer Efficiency of Selected Counterflow Air-to-Air Heat Exchangers Under Unbalanced Flow Conditions." Energies 18, no. 1 (2024): 117. https://doi.org/10.3390/en18010117.
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This study investigates the thermal performance of various counterflow air-to-air heat exchangers under unbalanced flow conditions, aiming to enhance the efficiency of heat recovery systems. Mechanical ventilation with heat recovery is critical in energy-efficient buildings to reduce heat loss, which can reach up to 60% in air exchange processes. This research focuses on the effects of flow imbalance on the heat transfer efficiency of three specific heat exchangers: two commercially available models (Recair Sensitive RS160 and Core ERV366) and a custom 3D-printed prototype (GV PROTO). Experimental tests measured temperature efficiency under both balanced and unbalanced flow conditions, with results indicating that flow imbalance significantly impacts thermal efficiency. Among the exchangers, the RS160 displayed the highest temperature efficiency, maintaining performance better than the others as flow rates increased. The results of the study show that even small differences in the thermal efficiency of different heat exchangers under balanced airflow conditions transform into significant differences under unbalanced conditions. These findings contribute to a better understanding of how real-world ventilation imbalances affect heat exchanger performance, offering insights to optimize energy efficiency in ventilation systems.
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Natig Abbasov, Natig Abbasov, and Ramin Naghizade Ramin Naghizade. "HEAT EXCHANGER STUDY AND OPTIMIZATION APPROACH FOR ENGINE EFFICIENCY IMPROVEMENT." ETM - Equipment, Technologies, Materials 10, no. 02 (2022): 42–56. http://dx.doi.org/10.36962/etm10022022-42.
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The scenario for the off-road machines during the next years will feature vehicles with relevant changes in terms, for example, of engine operative velocity and passive braking force reduction, with a concurrent increase (some 40 %) of thermal energy exchange needs by the heat exchanger. Engine, and hydraulic oil, temperatures will vary in function of actual requested power, to reduce the NOx production. This aspect, linked to the need to have an optimized engine layout (reduction of radiator dimensions) is the base of the work presented in the paper. The heat exchanger optimization is needed to obtain smaller, lighter, but at the same time more efficient, heat exchangers; this paper shows how it is possible to apply a CFD-mathematical approach on a cross-flow radiator with the aim to obtain a more efficient heat exchanger surface and reduced global dimensions. The approach used, and described in this work, made the performance evaluation possible not only on a single radiator, but on a complete production family variable both in dimension and technical characteristics. The approach is to split the exchanger into sub-domains having homogeneous boundary conditions, both in the cold and hot side, in order to collect on the WHTC (Wall Heat Transfer Coefficient) and the pressure drop. Individual results will be used as building blocks in order to have a reliable yet flexible estimate of the exchanger performance under different environmental conditions and dimensions. The results are encouraging and show the possibility to develop a new, optimized, radiator family, using a flexible and efficient design strategy. Keywords: heat exchanger, earth moving machineries, engine efficiency, optimization approach.
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Soloveva, Olga, Sergei Solovev, Vyacheslav Kunitsky, Sergei Lukin, and Anton Sinitsyn. "Determination of the optimal heat exchanger configuration for wastewater heat recovery." E3S Web of Conferences 458 (2023): 01024. http://dx.doi.org/10.1051/e3sconf/202345801024.
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The work aims to increase the efficiency of the hot water supply system based on local recovery of the heat of wastewater generated in the shower room for preheating cold water. The work uses mathematical modeling of the thermal operation of the heat exchanger under study. Physical modeling of the heat exchange process between media flows in a heat exchanger was carried out (experimental test). Temperatures of media flows were measured. The temperature distribution inside media flows was compared experimentally with data obtained analytically. In conclusion, an analysis and generalization of the results obtained is made. The result of the research was a designed recovery heat exchanger. Data were obtained on the thermal inertia of the device, i.e., about the required time for the device to achieve a stationary thermal regime from the moment it is turned on. Data were obtained on the potential energy effect from introducing a recovery heat exchanger, taking into account its thermal inertia. The number of showers required to pay off the heat exchanger was calculated. Data were obtained on the influence of changes in the geometric and operating parameters of the heat exchanger on the efficiency of wastewater thermal energy utilization. A methodology for designing a heat exchanger for specific operating conditions was developed. The developed method for designing a recovery heat exchanger allows one to determine the optimal configuration of the device under particular operating conditions and mode of use of the heat exchanger, taking into account its thermal inertia. It is planned to continue the work by assessing the energy and economic effect of using local wastewater heat recovery within the heat supply system of a separate settlement/region.
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Askarov, Dilmurod Bakhtiyor ugli. "FUNDAMENTALS OF DESIGN AND CALCULATION OF HEAT EXCHANGERS." Research Focus International Scientific Journal 2, no. 12 (2023): 154–58. https://doi.org/10.5281/zenodo.15043852.
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<strong>FUNDAMENTALS OF DESIGN AND CALCULATION OF HEAT EXCHANGERS</strong> <strong>Askarov Dilmurod Bakhtiyor ugli</strong> basic doctoral student, Namangan Institute of Engineering and Technology <strong>https://doi.org/10.5281/zenodo.15043852</strong> <strong>Abstract: </strong>Heat exchangers play a crucial role in various industrial applications by facilitating efficient heat transfer between two or more fluids. This paper presents the fundamental principles of heat exchanger design and calculation, focusing on hydrodynamic parameters, heat transfer coefficients, and overall thermal efficiency. The analysis covers the determination of the Reynolds number, pressure drop calculations, and the assessment of convective heat transfer coefficients using empirical correlations. Furthermore, the overall heat transfer coefficient is evaluated, considering thermal resistances and material properties. Understanding these parameters enables engineers to optimize heat exchanger performance, leading to enhanced energy efficiency and cost-effectiveness in industrial processes. <strong>Keywords:</strong> Heat exchangers, hydrodynamic calculation, Reynolds number, pressure drop, heat transfer coefficient, thermal efficiency, convective heat transfer.
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Saeb Gilani, Bahar, and Tatiana Morosuk. "Heat Exchanger Networks: Applications for Industrial Integrations." Energies 18, no. 12 (2025): 3021. https://doi.org/10.3390/en18123021.
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Heat integration is a crucial concept in process engineering and energy management. It refers to using heat exchangers and process modifications to maximize energy efficiency, lowering cost and/or carbon emissions within industrial processes through minimizing the external heating and cooling requirements (utility savings). There are two key aspects of heat integration. “Heat Exchanger Network” is an approach to designing efficient connections among the heat exchangers to transfer heat between several hot and cold streams. “Pinch Analysis” is a systematic methodology that determines the optimal energy recovery by identifying the “pinch point” to maximize heat recovery. The paper aims to review the actual status of research in the field of application of heat exchanger networks for industrial integrations and highlight the perspectives.
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Galiszewska, Beata, and Ewa Zender-Świercz. "Heat Recovery Using PCM in Decentralised Façade Ventilation." Energies 16, no. 8 (2023): 3310. http://dx.doi.org/10.3390/en16083310.
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A study of heat recovery in a façade ventilation unit was carried out under laboratory conditions using a climate chamber that allowed stable outdoor and indoor conditions to be simulated. The unit, equipped with a reversible fan and a chamber for the heat exchanger, controlled by an automation control system, was designed to exchange air in the room by alternating supply and exhaust cycles of specific durations. Three types of heat exchangers were tested, which were filled with different phase change materials, in order to estimate the efficiency of the façade ventilation unit in terms of its heat recovery capability. The efficiency of the unit was determined based on the temperature efficiency of heat recovery for 144 setting combinations. The best efficiency results between 73.56% and 76.29% were obtained with a solution using a heat exchanger consisting of cylinders with an external diameter of 10 mm and a wall thickness of 1 mm filled with jojoba oil in a one minute cycle. The tests confirmed that the heat exchangers, which are part of the façade ventilation unit, fulfil their function and allow heat recovery from the exhaust air to pre-heat the supplied air. The study complements the existing scientific knowledge on the efficiency of heat exchangers filled with phase change material, operating in winter conditions with work cycles up to 5 min.
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ZHOU, WenXue, Chen JIANG, BiNan SHOU, BoFeng BAI, and YanFeng ZHANG. "Energy efficiency evaluation method for plate heat exchanger." Chinese Science Bulletin 61, no. 8 (2015): 802–8. http://dx.doi.org/10.1360/n972015-00753.
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Ji, Wei, Jiyun Liu, Zi Lin, Lingwei Cui, Liubiao Chen, and Junjie Wang. "Study of the influence of the plate-fin heat exchanger pressure drop on the performance of liquid air energy storage." IOP Conference Series: Materials Science and Engineering 1327, no. 1 (2025): 012088. https://doi.org/10.1088/1757-899x/1327/1/012088.
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Abstract Liquid air energy storage is a very promising energy storage technology, which has the advantages of large capacity, long time, long life and no geographical restrictions. In order to improve the efficiency and economy of the liquid air energy storage system, the optimization design of the heat exchanger is the focus of the research, especially the low-temperature plate-fin heat exchanger employed in the process of air liquefaction. The key design parameters of the heat exchanger include heat transfer temperature difference and pressure drop. However, most of the current studies only focus on the heat transfer temperature difference of the heat exchanger. Reducing heat transfer temperature difference can improve the system efficiency, but significantly increase the cost of the heat exchanger. Therefore, this paper mainly studies the influence of the pressure drop of plate-fin heat exchanger on the system and economic performance. Thermodynamic analysis based on steady-state mathematical model was employed to evaluate the system efficiency. The results show that a moderate increase of pressure drop can significantly reduce the cost of the plate-fin heat exchanger, while the system efficiency decreases slightly.
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Kuzmenko, Oleksandra, Kostiantyn Dikarev, Daniil Rodionov, Oleksandra Martysh, Anar Iskenderov, and Maryna Babenko. "Geothermal Energy Use for the Additional Heat Supply of a Residential Building." Slovak Journal of Civil Engineering 28, no. 4 (2020): 15–22. http://dx.doi.org/10.2478/sjce-2020-0026.
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Abstract To ensure low-energy consumption in new generation energy-efficient houses, the technology of a ground heat exchanger with a heat recovery system is used almost everywhere. However, this technology has not been widely disseminated in Ukraine. The work is aimed at presenting insights from research on the combination of ground heat exchangers with a heat recovery system for building ventilation by analyzing the operational and techno-economic indicators obtained. Current studies permit revealing the optimal configuration of a ground heat exchanger with a heat recovery system for ventilation in a residential building in order to analyze the efficiency of ground heat exchangers with a heat recovery system for ventilation of a residential building in comparison with several conventional ventilation options to assess the main price/ performance ration of the process of constructing a ground heat exchanger with a heat recovery system and to determine the duration of the technological process, the labor-intensive characteristics, and the estimated cost of the technology.
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D, KARTHIK. "DESIGN AND FABRICATION OF THERMOELECTRIC HEAT EXCHANGER: UTILISING HEAT FOR ELECTRCITY." INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 08, no. 05 (2024): 1–5. http://dx.doi.org/10.55041/ijsrem33087.
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This project presents the design and fabrication of a thermoelectric heat exchanger integrating Peltier modules for the conversion of heat energy into electricity. By employing thermoelectric generators, the system offers a novel approach to harnessing waste heat for sustainable power generation. Through meticulous design considerations and fabrication techniques, the device aims to optimize energy conversion efficiency, paving the way for applications in energy recovery and thermal management in various industries. Key Words: Thermoelectric heat exchanger, Peltier module, Sustainability, Industrial energy efficiency.
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Anastasovski, Aleksandar Kosta. "Energy efficiency improvement in the system for drying baker`s yeast." Macedonian Journal of Chemistry and Chemical Engineering 38, no. 1 (2019): 115. http://dx.doi.org/10.20450/mjcce.2019.1476.
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Drying processes are one of the main consumers of heat energy in production. Any decreases in heat consumption during the drying process will considerably decrease production costs. This study analyzes the high consumption of heat in the drying of baker`s yeast. The main task is to minimize the energy demand and lower the price of the final products with partial heat recovery. These changes will require system modifications. One of the most popular and effective methods that can be used in this case is heat process integration with Pinch Technology. In this study, a reference system was simulated with a mathematical model and analyzed for waste heat streams.This paper suggests the redesigning of a drying system for production of active dry yeast. Selected streams that satisfy conditions for heat process integration were involved in the evaluation for a better solution. Two different scenarios were proposed as possible solutions. The suggested solutions are retrofit designs of Heat Exchanger Networks. These Heat Exchanger Networks include already installed heat exchangers as well as new heat transfer units. The selection of better design was made with economic analysis of investment. The proposed scenarios of the analyzed sub-system give improvement in heat energy recovery. The best determined solution reduces the cost and thus has the highest profitability, but not the highest heat energy recovery.
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Klimov, R., and V. Kirilyuk. "EFFICIENCY OF THE NOZZLES OF CONTACT HEAT EXCHANGERS." Collection of scholarly papers of Dniprovsk State Technical University (Technical Sciences) 1, no. 38 (2021): 92–98. http://dx.doi.org/10.31319/2519-2884.38.2021.11.
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At powerful thermal power plants or boiler houses, the efficiency depends to the greatest extent on the amount of heat lost with the cooling of turbine condensers, exhaust gases that have a high temperature. Each type of such losses is a large unused energy potential, that is, a secondary energy resource that can be used. At the same time, the use of secondary resources and industrial emissions will improve the ecological situation in the regions, and this has always been an urgent task.
 As a rule, large losses of thermal secondary energy resources in boilers are reduced by installing economizers and air heaters. Contact types of heat exchangers are distinguished by the best efficiency in operation. In contact economizers, to increase the surface of heat and mass transfer, it is advisable to use various types of nozzles.
 The aim of the study is to develop such an indicator, with which it is possible to determine the optimal type of nozzle of the contact economizer installed after the steam boiler. This indicator should show the highest heat engineering efficiency of the packing with a small hydraulic resistance of the heat exchanger.
 By using the coefficient of specific energy efficiency of the packing in the heat exchanger of waste gases of heating equipment, it is possible to analyze the work of the packing space from the standpoint of thermal and hydraulic efficiency and select the optimal type of packing for each individual unit or installation. Geometric parameters determine the required volume of the apparatus and the hydraulic resistance of the exhaust gases movement. The hydraulic resistance affects the consumption of electrical energy for the drive of smoke exhausters for sucking off exhaust gases from heat engineering installations through the free section of the heat exchanger. Taking into account the developed indicator of the specific energy efficiency in waste heat utilizers, it is possible to select such a type of packing, at which the optimal level of waste heat utilization will be achieved.
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Haghshenas, Fard, Mohammad Talaie, and Somaye Nasr. "Numerical and experimental investigation of heat transfer of ZnO/Water nanofluid in the concentric tube and plate heat exchangers." Thermal Science 15, no. 1 (2011): 183–94. http://dx.doi.org/10.2298/tsci091103048h.
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The plate and concentric tube heat exchangers are tested by using the water-water and nanofluid-water streams. The ZnO/Water (0.5%v/v) nanofluid has been used as the hot stream. The heat transfer rate omitted of hot stream and overall heat transfer coefficients in both heat exchangers are measured as a function of hot and cold streams mass flow rates. The experimental results show that the heat transfer rate and heat transfer coefficients of the nanofluid in both of the heat exchangers is higher than that of the base liquid (i.e., water) and the efficiency of plate heat exchange is higher than concentric tube heat exchanger. In the plate heat exchanger the heat transfer coefficient of nanofluid at mcold = mhot = 10 gr/sec is about 20% higher than base fluid and under the same conditions in the concentric heat exchanger is 14% higher than base fluid. The heat transfer rate and heat transfer coefficients increases with increase in mass flow rates of hot and cold streams. Also the CFD1 code is used to simulate the performance of the mentioned heat exchangers. The CFD results are compared to the experimental data and showed good agreement. It is shown that the CFD is a reliable tool for investigation of heat transfer of nanofluids in the various heat exchangers.
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Bendea, Codruta, Ioan Felea, and Gabriel Bendea. "Energy Performance Analysis of the first Research-only Ground Coupled Heat Pump in Romania." Journal of sustainable energy 1, no. 4 (2010): 57–62.
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One laboratory belonging to Energy Engineering Faculty is heated with a ground-coupled heat pump (GCHP) system having two types of ground heat exchangers: a vertical one and a horizontal one. This paper presents, at first, several coefficients of performance that can be defined for heat pumps together with their usability. Then, an energy efficiency model is set specially for CGHP systems. In this paper the simulation of energy performances is done only for the vertical heat exchanger (borehole heat exchanger) having two configurations: single-U and double-U. All simulation results range between normal values and can be considered realistic.