Journal articles: 'Internal heat exchanger'

1

Li, Jie. "Numerical Research in Effects of Baffles on Heat Transfer Characteristics of a Tunnel Kiln’s Flue Gas Heat Exchanger." Advanced Materials Research 953-954 (June 2014): 911–14. http://dx.doi.org/10.4028/www.scientific.net/amr.953-954.911.

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In order to investigate effects of baffles on heat transfer characteristics of a tunnel kiln’s flue gas heat exchanger, the flow fields and temperature fields in two exchangers, one with baffles and the other without, under operative conditions, are separately simulated by using FLUENT code. According to simulation results, average temperature at the air outlet and average pressure at the air inlet of the exchanger with baffles are separately 67.2°C and 265 Pa, and those in the case of the exchanger without baffles are respectively 60.4°C and 240 Pa. Reasons why the baffles exert high influence on heat transfer characteristics of the exchanger are analyzed. On basis of the data and analysis, two conclusions are drawn: (1) Installation of baffles exerts high influence on heat transfer characteristics of the heat exchanger studied. (2) The reason why the baffles could exert such influence is that the baffles prevent much air from flowing into external zones of the baffles, so in per unit time more air exchanges heat energy with hot walls of heat exchange tubes, which are in internal zones of the baffles.

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Zhelykh, Vasyl, Olena Savchenko, and Vadym Matusevych. "Horizontal earth-air heat exchanger for preheating external air in the mechanical ventilation system." Selected Scientific Papers - Journal of Civil Engineering 13, no. 1 (December 1, 2018): 71–76. http://dx.doi.org/10.1515/sspjce-2018-0021.

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Abstract To save traditional energy sources in mechanical ventilation systems, it is advisable to use low-energy ground energy for preheating or cooling the outside air. Heat exchange between ground and outside air occurs in ground heat exchangers. Many factors influence the process of heat transfer between air in the heat exchanger and the ground, in particular geological and climatic parameters of the construction site, parameters of the ventilation air in the projected house, physical and geometric parameters of the heat exchanger tube. Part of the parameters when designing a ventilation system with earth-air heat exchangers couldn’t be changed. The one of the factors, the change which directly affects the process of heat transfer between ground and air, is convective heat transfer coefficient from the internal surface of the heat exchanger tube. In this article the designs of a horizontal earthair heat exchanger with heat pipes was proposed. The use of heat pipes in designs of a horizontal heat exchanger allows intensification of the process of heat exchange by turbulence of air flow inside the heat exchanger. Besides this, additionally heat transfer from the ground to the air is carried out at the expense of heat transfer in the heat pipe itself.

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Fyk, Мykhailo, Volodymyr Biletskyi, Madjid Аbbood, and Fabris Аnzian. "Geothermal heat use to eliminate hydrate formations in oil deposit injection wells." E3S Web of Conferences 230 (2021): 01019. http://dx.doi.org/10.1051/e3sconf/202123001019.

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The article is devoted to an actual issue: the development of internal downhole heat exchangers technology to combat hydration in injection wells. Purpose: development of conceptual solutions for the use of geothermal coolant in the internal well heat exchanger of the injection well. A scheme of an internal downhole heat exchanger with a geothermal heat carrier has been developed, and includes a supply line of a geothermal carrier through the heat exchange surface of the injection well into the productive reservoir of the oil field. The scheme provides targeted utilization of thermobaric energy of a geothermal source to combat hydration in the injection well. A mathematical apparatus for describing the process of heat utilization and heat exchange in injection well is proposed. It is established that the capacity of one geothermal well discovered at the oil depths in the Dnipro-Donetsk basin is sufficient to eliminate hydration in 1-3 injection wells, and determines the feasibility of their joint work.

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Harris, D. K., D. G. Warren, and V. W. Goldschmidt. "Impact of Manifold Design on Heat Exchanger Efficiency." Journal of Heat Transfer 119, no. 2 (May 1, 1997): 357–62. http://dx.doi.org/10.1115/1.2824232.

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The impact of manifold design on single-phase heat exchanger effectiveness is studied using the NTU-Effectiveness method. Manifolds are devices that redistribute the internal flow stream of a heat exchanger from one to several passages. Two manifold types are identified: collector box and direct split designs. The particular application considered is that of a gas fired forced air heating system. A general enhancement analysis is performed which covers four different combinations of performance and objective criteria. Three cases involve increasing the heat exchanger effectiveness while constraining either the internal flow head loss, the internal mass flow rate, or their product. The other case involves reducing the required heat exchanger flow length while constraining the heat transfer rate. Familiar convection correlations are then incorporated into the enhancement analysis to predict general trends and behavior when the main tube is split into several smaller tubes. Analytical estimates of improved effectiveness are presented for three operating conditions of an actual heat exchanger which possesses a manifold. Experimental data acquired from the gas-to-gas heat exchanger are compared to numerical predictions of its performance without a manifold (baseline design). The analytical equations developed closely predict the improvement in heat exchanger effectiveness.

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Kumar, Dr Asheesh. "Design and Simulation of Counter Flow Heat Exchanger with Fins and Internal Ribs." International Journal for Research in Applied Science and Engineering Technology 9, no. VI (June 30, 2021): 3221–27. http://dx.doi.org/10.22214/ijraset.2021.35681.

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A Heat Exchanger is a device to transfer heat from fluid at higher temperature to fluid at lower temperature with highest efficiency. Designed for various applications such as preheating the water before sending it into boiler for generation of steam. This work is carried out with the primary objective of increasing the thermal efficiency of the procedure heat transfer process. There are different types of heat exchangers from which shell and tube heat exchanger is considered for this present work. High temperature water passes through the copper tubes and low temperature water flows outside the copper tubes. To enhance the rate of heat, transfer the modified design is implemented. The design consists of fins outside the copper tubes to increase the surface area in contact with outside fluid. Also, ribs are provided inside the copper tubes for increasing the turbulence along with more area of contact. This paper mainly deals with design, modelling and CFD analysis of the heat exchanger. Overall heat transfer coefficient of the fins and internal ribs of heat exchanger is based on the results of effectiveness-NTU approach and LMTD approach. Modelling of various components are presented with the help of standard modelling software, solid works. Simulation of the process is done using ANSYS. The simulated results obtained in the software are compared with the published experimental results which are very close to our modified design heat exchanger and it is found that the results are very close to experimental results.

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Vorontsova, Valeriya Leonidovna, Alfiya Gizzetdinovna Bagoutdinova, and Almaz Fernandovich Gilemzianov. "Mathematical Models of the Ocurved Spring Tubes Surfaces." Journal of Computational and Theoretical Nanoscience 16, no. 11 (November 1, 2019): 4554–59. http://dx.doi.org/10.1166/jctn.2019.8353.

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One of the ways to intensify heat exchange processes is the creation of compact heat exchangers with a developed heat exchange surface. It is known that coil-type channels provide a developed heat exchange surface and belong to one of the most efficient and technological designs of heat exchange elements. In this regard, the authors proposed a small-size heat exchanger of the “pipe in pipe” type with an internal coil spring-twisted channel, and the authors of the proposed article developed mathematical models describing the heat-exchange surfaces of pipes of complex configurations, including coil spring-coiled channels. The equations of heat transfer surfaces are written in vector-parametric form based on the fundamental principles of analytical and differential geometry. In order to verify the adequacy and visualization of the written equations, surfaces were constructed using the Matlab application software package. The proposed mathematical models can be used in computer simulation of hydrodynamic processes during the flow of liquid media in curved channels, which will allow to explore and further optimize their internal geometry by changing the parameters of the equations. This work is a continuation of research on the creation of efficient heat exchangers.

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Soroka, B., and V. Zgurskyi. "Comprehensive analysis of transfer processes in modern high-temperature heat exchangers." Thermophysics and Thermal Power Engineering 41, no. 3 (October 23, 2019): 26–32. http://dx.doi.org/10.31472/ttpe.3.2019.4.

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The CFD modeling of high-temperature tube heat exchanger has been carried out. The results of numerical analysis of internal and external secondary emitters’ (SEE) influence upon intensity and uniformity of resulting heat transfer have been presented and discussed. An internal SEE have the determining impact upon heat exchange process thus enhancing the resulting heat flux till extra 40%.

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Seybold, Lothar, William Hill, and Jean-Jacques Robin. "Internal Heat Exchanger System Integration for R1234yf Refrigerant." SAE International Journal of Materials and Manufacturing 4, no. 1 (April 12, 2011): 181–94. http://dx.doi.org/10.4271/2011-01-0128.

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Rajalakshmi, K. "Control Of Heat Exchanger Using Internal Model Controller." IOSR Journal of Engineering 03, no. 7 (July 2013): 09–15. http://dx.doi.org/10.9790/3021-03710915.

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Kocheril, Rajesh, and Jacob Elias. "CFD simulation for evaluation of optimum heat transfer rate in a heat exchanger of an internal combustion engine." International Journal for Simulation and Multidisciplinary Design Optimization 11 (2020): 6. http://dx.doi.org/10.1051/smdo/2019017.

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Heat exchanger is an essential component of an engine cooling system. Radiators are compact heat exchangers used to transfer the heat absorbed from engine to the cooling media. The jacket cooling water gets cooled and re-circulated into system after exchanging the heat with cooling water in a heat exchanger. Conventional fluids like water, oil, ethylene glycol, etc. possess less heat transfer performance; therefore, it is essential to have a compact and effective heat transfer system to obtain the required heat transfer. A reduction in energy consumption is possible by improving the performance of heat exchanging systems and incorporating various heat transfer enhancement techniques. In this paper, the heat transfer rate using nano-sized ferrofluid with and without magnetization is analysed using CFD simulation and compared with the experimental values obtained from a heat exchanger using water as base fluid. The heat transfer rate is measured using different combinations by varying the percentage of nano particles and by introduction of different magnetic intensity (gauss) on to the ferrofluid. The optimum heat transfer rate and efficiency of heat exchanger is calculated with the different combinations and the values are compared with the values of CFD simulation. CFD simulation was undertaken for water alone as cooling media and for water with ferro particle addition from 2% to 5%. The difference in temperature observed to be similar with experimental values. The deviation is within the acceptable limit and therefore the experimental findings are validated. The experiment was conducted on a parallel flow heat exchanger with water alone as cooling media, water with varying percentage of ferro fluid and water with varying magnetic intensity on ferrofluid. Percentage of ferro particles added up to where the optimum temperature difference could be obtained and the magnetic intensity also varied up to the optimum value.

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Deng, Ya Dong, Shan Chen, and Xun Liu. "Thermal Optimization of Exhaust-Based Thermoelectric Generator." Materials Science Forum 743-744 (January 2013): 88–93. http://dx.doi.org/10.4028/www.scientific.net/msf.743-744.88.

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The potential for automotive exhaust heat based thermoelectric generator (TEG) has been increased with continuously advances in thermoelectric technology. The thermal performance of the heat exchanger in exhaust-based TEG was analyzed. In terms of interface temperature and thermal uniformity, the thermal characteristics of the heat exchangers with different internal structures, materials and thicknesses were discussed. CFD simulations and infrared experiments on a high-performance production engine with a dynamometer were carried out. It was proved that the plate-shape heat exchanger made of brass with internal baffles and the thickness of 3mm, obtained a relatively optimal thermal performance, and it will help to improve the thermal performance of the TEG.

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12

Huang, Guidong, Songyuan Zhang, Zhong Ge, Zhiyong Xie, Zhipeng Yuan, Chong Tang, Jianbin Xie, and Jian Xu. "Thermal performance analysis of organic flash cycle using R600A/R601A mixtures with internal heat exchanger." Thermal Science, no. 00 (2020): 296. http://dx.doi.org/10.2298/tsci200507296h.

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In this study, the thermal performance of an internal heat exchanger-organic flash cycle system driven by geothermal water was investigated.R600a/R601a mixtures were selected as the working fluid. The effects of the mole fraction of mixtures on the heat absorption capacity of the heater, the temperature rise of cold working fluid in the internal heat exchanger, net power output, thermal efficiency, and electricity generation costs were analyzed. The net power outputs, electricity generation costs, and thermal efficiency of the internal heat exchanger-organic flash cycle and simple organic flash cycle systems were compared. Results showed that the system using theR600a/R601a mixtures (0.7/0.3mole fraction) has the largest net power output, which increased the net power output by 3.68% and 42.23% over the R601a and R600a systems, respectively. WhentheR600a mole fraction was 0.4, the electricity generation costs reduction of the internal heat exchanger-organic flash cycle system was the largest (1.77% compared with the simple organic flash cycle system).The internal heat exchanger can increase the thermal efficiency of organic flash cycle, but the net power output does not necessarily increase.

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13

Youssef, Ahmed A., Muthanna H. Al-Dahhan, and Milorad P. Dudukovic. "Bubble Columns with Internals: A Review." International Journal of Chemical Reactor Engineering 11, no. 1 (June 18, 2013): 169–223. http://dx.doi.org/10.1515/ijcre-2012-0023.

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Abstract Most industrial bubble column reactors require the utilization of internal structures for heat transfer and/or for controlling the flow structures and back mixing in the system. The internals denote all types of innards added to a bubble column, such as perforated plates, baffles, vibrating helical springs, mixers, and heat exchanger tubes. In commercial scale bubble columns, instrumentation probes, down-comers, and risers with heat exchangers are all considered. This review presents the state-of-knowledge of bubble columns with internals. It starts with an introduction. The second section discusses the horizontal internals, and the following section examines the studies involving vertical internals.

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14

SAKATA, Yuji, Naohisa TAKAGAKI, Osamu KAWANAMI, and Ituro HONDA. "Basic Study on Internal Freezing of Automotive Heat Exchanger." Proceedings of Mechanical Engineering Congress, Japan 2020 (2020): S05417. http://dx.doi.org/10.1299/jsmemecj.2020.s05417.

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15

Mat Noh, Nor Amelia Shafikah, Baljit Singh Bhathal Singh, Muhammad Fairuz Remeli, and Amandeep Oberoi. "Internal Combustion Engine Exhaust Waste Heat Recovery Using Thermoelectric Generator Heat Exchanger." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 82, no. 2 (April 30, 2021): 15–27. http://dx.doi.org/10.37934/arfmts.82.2.1527.

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Heat engine converts chemical engine available in fuel to useful mechanical energy. One of the most famous heat engines is internal combustion (IC) engine. IC engine plays a pivotal role in transportation and other industrial applications. A lot of waste heat is rejected from a typical IC engine as the conversion efficiency of this type of engine is only about 35-40 %. The waste heat has the potential to be tapped and converted into useful energy. This can help to increase the performance of the IC engine system. This work focused on the conversion of the waste heat energy of the IC engine into electricity by using thermoelectric generator (TEG). The aim of the project was to demonstrate the applicability of TEG to convert waste heat from exhaust to useful electrical energy. Two TEGs were individually tested to attain the electrical characterization and also tested on series and parallel connections. The study showed that the series connection of TEGs has improved and increased voltage generation but parallel connection is more reliable. The system proved that the waste heat recovery using TEGs has tremendous application in IC engine for better and higher efficient engine performance.

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Ivancu, Ionel, Daniel Stanciu Dragomir, Vasile Ionut Crismaru, and Gheorghe Dumitrascu. "Heat Transfer Modeling for a Plate Heat Exchanger used in Solar Power Systems." Applied Mechanics and Materials 371 (August 2013): 682–86. http://dx.doi.org/10.4028/www.scientific.net/amm.371.682.

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The paper tackles the non-steady state heat transfer modeling in a plate heat exchanger. The heat exchanger is designed to perform the internal heat recovering in a solar assisted Joule Brayton engine. The modeling followed two cases, the first case considers an open hybrid solar engine and, the second case evaluates a closed one, using different working agents.

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17

Jang, Jin Yong, and Ji Hwan Jeong. "Performance of multiple mini-tube heat exchangers as an internal heat exchanger of a vapor-injection cycle heat pump." Heat and Mass Transfer 52, no. 4 (May 23, 2015): 741–52. http://dx.doi.org/10.1007/s00231-015-1592-5.

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18

Chen, Hung Chien, Tzu Chen Hung, and Yi Feng Chen. "Numerical Analysis of Heat Transfer in the Concentric Heat Exchanger." Applied Mechanics and Materials 275-277 (January 2013): 572–75. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.572.

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The computational fluid dynamics (CFD) software is used to compute three-dimensional concentric heat exchanger in this research. In order to reduce the burden of the computational time, the concentric heat exchanger is simplified sector of 5° for the regular arrangement of internal shape. The working fluids for hot flow and cold flow are helium and molten salt individually. The arrangements for hot and cold flow paths within a heat exchanger is opposite. This study is mainly focused on the distribution of field for the two layers of concentric heat exchanger. The width of the flow channel as well as the length, pitch, thickness and angle of fin have been changing to analyze the effectiveness-NTU method. The results showed that the best heat transfer of fin thickness, angle, space, length, and flow channel are under 5mm, 5°, 8mm, 44mm, and 12mm, respectively.

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Sciubba, Enrico. "A Note on the “Optimal” Design of Disc-Shaped Heat Exchangers." Proceedings 58, no. 1 (September 12, 2020): 8. http://dx.doi.org/10.3390/wef-06904.

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The continuous quest for improving the performance of heat exchangers, together with evermore stringent volume and weight constraints, especially in enclosed applications (engines, electronic devices), stimulates the search for compact, high-performance units. One of the shapes that emerged from a vast body of research is the disc-shaped heat exchanger, in which the fluid to be heated/cooled flows through radial, often bifurcated, channels inside of a metallic disc. The disc, in turn, exchanges heat with the heat/cold source (the environment or another body). Several studies have been devoted to the identification of an “optimal shape” of the channels: Most of them are based on prime principles, though numerical simulations abound as well. The present paper demonstrates that, for all engineering purposes, there is only one correct design procedure for such a heat exchanger, and that this procedure depends solely on the technical specifications (exchanged thermal power, materials, surface quality): The design, in fact, reduces to a zero-degree of freedom problem! The argument is described in detail, and it is shown that a proper application of the constraints completely identifies the shape, size and similarity indices of both the disc and the internal channels. The goal of this study is not that of “inventing” a novel heat exchanger design procedure, but that of demonstrating that -in this as in many similar cases- a straightforward application of prime principles and of diligent engineering rules may generate “optimal” designs. Of course, the resulting configurations may be a posteriori tested as to their performance, their irreversibility rates, their compliance with one or the other “techno-economical optimization methods”, but it is important to realize that they enjoy a sort of “embedded” optimality.

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Vijayan, Raghavan, and Pss Srinivasan. "Experimental evaluation of internal heat exchanger influence on R-22 window air conditioner retrofitted with R-407C." Thermal Science 14, no. 1 (2010): 39–47. http://dx.doi.org/10.2298/tsci1001039v.

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The performance of one ton of refrigeration window air conditioner working with R-22 and retrofitted with eco friendly alternative refrigerant R-407C is experimentally investigated An internal heat exchanger is also added to the same air conditioner to provide liquid overfeeding operation. When retrofitting the R-22 system with R-407C, the coefficient of performance is found to drop by 7.28%, however when internal heat exchanger is included the performance is improved. It is observed that the inclusion of internal heat exchanger has increased the coefficient of performance by 5.86% when running on R-22 and 6.18% when running on R-407C, under the given conditions.

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21

Chang, Chih-Chung, Chiao-Hung Cheng, Ming-Tsun Ke, and Sih-Li Chen. "Experimental and Numerical Investigations of Air Cooling for a Large-Scale Motor." International Journal of Rotating Machinery 2009 (2009): 1–7. http://dx.doi.org/10.1155/2009/612723.

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This article experimentally and numerically investigates the thermal performance of a 2350-kW completely enclosed motor, which is cooled through an air-to-air heat exchanger. The air in the heat exchanger includes external and internal flow paths. The external air driven by the rotation of the centrifugal fan goes through the heat exchanger mounted on the top of the frame. The internal air absorbs heat released from the stator and the rotor and then transfers the heat to the heat exchanger through the motion of two axial fans and the rotor. Several test rigs have been set up to measure the performance of the fan and the motor. The Fluent software package is adopted to analyze the complicated thermal-fluid interactions among the centrifugal fan, two axial fans, heat exchanger, stator, and rotor. The measured data, including the fan performance curves and the temperature profiles of the heat exchanger and the stator, show good agreement with the simulated results. The numerical calculations also show that the nonuniform external flow distribution through the heat exchanger and the air leakage between the axial fan and the rotor reduces the cooling ability of the motor. A detailed discussion is also included to improve the motor cooling performance.

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Kuchař, Jiří, Viktor Kreibich, Vladimir Agartanov, and Milan Petřík. "Maintenance and Cleaning of Heat Exchangers." Materials Science Forum 919 (April 2018): 396–403. http://dx.doi.org/10.4028/www.scientific.net/msf.919.396.

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Each machine and energetic equipment needs maintenance or cleaning time. Energetic equipment needs more regular cleaning so it works well and reliably, and the heat transfer is permanent and there is no energy loss. The inner surface of heating systems are successively covering during their operation, due to the chemical and physico-chemical reactions, solid, some dirt, minerals and corrosion products. It is therefore advisable to regularly clean and service these devices. The article deals with the distribution of exchangers, formation of sediments and corrosion products associated with their operation. In addition, the article describes the types of internal surface cleaning methods. The whole article ends with a chemical cleaning experiment, where the heat exchanger clogged with mineral deposits was cleaned. The defectoscopic images show how the chemical can remove all deposits and restore the exchanger flow to its original state.

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Seybold, Lothar, William Hill, and Ioannis Lazaridis. "Internal Heat Exchanger Integration for a Dual Evaporator MAC System." SAE International Journal of Materials and Manufacturing 6, no. 3 (April 8, 2013): 549–66. http://dx.doi.org/10.4271/2013-01-1504.

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Han, Jian Huang, Yang Liu, Zun Ce Wang, and Sen Li. "Numerical Simulation and Structure Optimization on the Corrugated Tubes of a Double Pipe Heat Exchanger." Applied Mechanics and Materials 385-386 (August 2013): 65–68. http://dx.doi.org/10.4028/www.scientific.net/amm.385-386.65.

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The combination of numerical simulation and orthogonal experimental design method can reduce the test number. Structural parametric modeling research on corrugated tube of heat exchangers in our work to establish the fluid flow and heat transfer numerical simulation model. A scheme of orthogonal test of a corrugated tube, which includes 4 factors and 3 levels and has taken heat exchange quantity, resistance of the internal tube and annular gap as evaluation indexes, was designed. A method combining with the difference and the variance analysis was taken to analysis the result of orthogonal test, and the effect of different structure parameter on corrugated tube was achieved. Finally the optimal structure parameter of the corrugated tube was obtained by a comprehensive balance method, and those methods above-mentioned provide a reference for the design or promotion of the corrugated tube of tube heat exchanger.

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Никулин, Н., and Nikolay Nikulin. "THE STUDY OF HEAT TRANSFER IN INTENSIFIED SHELL AND TUBE DEVICE." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 4, no. 4 (April 25, 2019): 77–82. http://dx.doi.org/10.34031/article_5cb1e65e6c0d28.53980880.

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The use and prevalence of heat exchangers in Russian heat supply systems are considered. Attention is paid to the improvement of serial heat exchangers with smooth tubes – the increasing of heat transfer coefficient. One of the ways to increase the heat transfer coefficient is considered: it is the turbuliza-tion of the fluid flow on the heat exchange surface. The original design of the heat exchange surface for shell and tube devices of heat supply systems is presented. The dynamics of the heated fluid in the annular space of a shell and tube heat exchanger when flowing around the heat exchange surface with a modified geometry is studied (RF Patent 149737). A feature of the dynamics is a circular edge (element of the surface of heat exchange), which contributes to the creation of turbulence in the flow of the heated liquid on the plate and on the surface of the next edge. Emphasis is placed on heat ex-change processes between the solid surface of the edges and the heated fluid. For a circular cross sec-tion, the equation of thermal conductivity in cylindrical coordinates is compiled, taking into account the stationary heat exchange process, with an internal source of thermal energy. Solution of equation makes possible to determine the change in temperature on the surface and the average temperature of the edge. This value allows determining the Prandtl number to calculate the heat transfer coefficient.

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Wang, Zi Fang, Ye Bin Yin, Wei Ji, Yan Meng, Lian Sheng Liu, Jin Xiang Wu, En Yu Wang, and Xiang Gou. "Numerical Simulation Research on the Internal Flow of a Heat Exchanger." Applied Mechanics and Materials 694 (November 2014): 200–204. http://dx.doi.org/10.4028/www.scientific.net/amm.694.200.

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Spiral tube exchanger is one of the most important heat transfer devices among the electric water boilers. In this paper, CFD software is introduced to simulate the process of the flow of the spiral tube exchanger. Cases with different inlet velocities of the cold water have been conducted and results show that, temperature increment of the cold water reaches 38.87 K, 20.21 K and 12.12 K with the inlet velocity of the cold water set as 0.05 m/s, 0.09 m/s and 0.13 m/s respectively.

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Wang, Xiao Jing, Zhi Min Wang, and Nian Wang. "Finite Element Analysis for the Stiffness and the Buckling of Corrugated Tubes in Heat Exchanger." Advanced Materials Research 468-471 (February 2012): 1675–80. http://dx.doi.org/10.4028/www.scientific.net/amr.468-471.1675.

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Corrugated tubes in a heat exchanger are analyzed by using the FEA methods. And the formula how to compute single wave’s rigidity is obtained. Besides, methods of analyzing the stability of corrugated tubes under internal compressive pressure and external pressure are proposed which include characteristic value analysis and non-linear stability analysis, thus providing theory basis for the stability research of heat exchangers.

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Li, Xiao Hong. "Calculation of Axial Expansion in Vertical Shell and Tube Heat Exchanger with Expansion Joint." Key Engineering Materials 480-481 (June 2011): 868–71. http://dx.doi.org/10.4028/www.scientific.net/kem.480-481.868.

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In this paper, the axial elongation of vertical shell and tube heat exchanger with expansion joint are studied based on thetheories of static mechanics. The axial elongations of heat exchanger’s tube side and shell side that causes by thermal expansion, internal pressure and gravity are considered individually. By comparing and analyzing a typical example, it is shown that thermal expansion is the key reason other than internal pressure and gravity to the axial elongation of tube side and shell side structure. The results show that the axial elongation induced by internal pressure and gravity except thermal expansion is only 5% of total and can be eliminated in engineering practice.

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Siregar, Abdul Haris, Hary Sutjahjono, and Agus Triono. "ANALISIS TEGANGAN PADA ELBOW PIPE SA 123 Gr.T22 DI SHELL AND TUBE HEAT EXCHANGER." ROTOR 12, no. 1 (June 1, 2020): 10. http://dx.doi.org/10.19184/rotor.v12i1.15293.

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Heat exchanger is a system used to transfer heat between fluids. The most cases of heat exchanger failure is leakage pipe. This study aims to see the effect of increasing the radius of the elbow pipe in the shell and tube heat exchanger on the stress due to internal and external pressure. The research using ANSYS 15 at elbow pipe radius 40 mm, 51 mm and 62 mm with internal pressure 20.4 MPa and external pressure 2.04 MPa. Obtained maximum results occur in 40 mm radius elbow pipe of 81,528 MPa and minimum result occurs in 62 mm of 76,212 MPa. The stress that occurs in all elbow pipe can be said safe because the stress value is still under the pipe material yield point.

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Lu, Hui Xia, Jing Lv, Zhe Bin He, Jin Yu Wang, and Jia Wei Zhou. "Theoretical Analysis and Experimental Researches on Internal Heat Exchanger in CO₂ Trans-Critical Cycle." Applied Mechanics and Materials 204-208 (October 2012): 4336–42. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.4336.

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The change of system performance caused by regenerative cycle in different operating conditions was analyzed in this paper, comparing the cycle with or without internal heat exchanger in a CO2 trans-critical cycle. We analyzed theoretically the performance of CO2 trans-critical cycle with the internal heat exchanger, and found that the coefficient increased with the decreasing of the high side pressure and the increasing of outlet temperature in gas cooler, in a certain range of the high side pressure and outlet temperature. The evaporation temperature could be raised when the system with internal heat exchanger and at the same time the coefficient of performance could be improved obviously. At lower high side pressure, the performance coefficient could be improved significantly by increasing the suction superheat. The higher the gas cooler outlet temperature was, the more obvious the increase was.

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Donmuang, Amorn, and Teerapat Chompookham. "Correlation for Predicting Heat Transfer Characteristics of A Helical Oscillating Heat Pipe (HOHP) at Normal Operating Conditions." International Journal of Renewable Energy Development 10, no. 2 (November 20, 2020): 171–82. http://dx.doi.org/10.14710/ijred.2021.33671.

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The helical oscillating heat pipe (HOHP) is a high heat transfer heat exchanger with high flexibility in its installation and can therefore be used in a wide variety of applications. In this study, the effect of various parameters on the heat transfer rates of HOHP were used to establish a correlation equation for use in the heat flux prediction, the dimensionless parameters studied were rv/rl, Bo, Nu, We, Ja, Pr, Fr, Co, Ga, Bi, Wo, Oh, and Ku. Experiments were conducted to find out their effects on the heat transfer rates of copper HOHP with internal diameters were 2.03, 3.5, and 4.5 mm. The lengths of evaporator and condenser sections were equal at 1500, 2000, and 2500 mm. The pitch coils were 10, 15, and 20 mm. The working fluids used were R134a, ethanol, and water with the filling ratios were 30%, 50%, and 80% of the total internal volume. The temperature of evaporator section were varied between 60, 70, and 80°C within normal operating conditions in a vertical position. The results of the experiment showed that the internal diameter, lengths of evaporator/condenser sections, pitch coil, type of working fluid, filling ratio and temperature of evaporator section affected the heat transfer rates of the HOHP. The results of dimensionless parameters can establish the correlation equation to predict the heat flux for the HOHP as shown in this paper. In addition, the results of this research can be applied in the designing and construction of HOHP heat exchangers.

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Boewe, D. E., C. W. Bullard, J. M. Yin, and P. S. Hrnjak. "Contribution of Internal Heat Exchanger to Transcritical R-744 Cycle Performance." HVAC&R Research 7, no. 2 (April 1, 2001): 155–68. http://dx.doi.org/10.1080/10789669.2001.10391268.

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Goossens, Maria, Philippe Riviere, Cedric Teuillieres, Cong Toan Tran, Odile Cauret, and Dominique Marchio. "Experimental Validation of On-Field Measurement Method for a Heat Pump System with Internal Heat Exchanger." International Journal of Air-Conditioning and Refrigeration 24, no. 02 (June 2016): 1650011. http://dx.doi.org/10.1142/s2010132516500115.

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Determining the on-field heating capacity and coefficient of performance (COP) of residential air-to-air heat pumps (HPs) is problematic, given that measuring accurately the enthalpy and, specifically, the mass flow rate of air is challenging. This paper validates a promising on-field performance measurement method for HPs with an internal heat exchanger (IHX) as vapor injection system using experimental data obtained from air-to-water heat pump prototype in several operating conditions. The method is based on refrigerant fluid measurements and component energy/mass balances. Nonintrusive sensors, such as surface temperature sensors, are used to estimate pressure and refrigerant mass flow rate in different types of heat pump systems, including air-to-air. Obtained results compared with intrusively measured reference values in steady-state conditions are in good agreement, suggesting that a comprehensive performance analysis can be conducted in already-installed high efficiency residential IHX air-to-water HPs, as well as internal heat exchanger air-to-air HPs.

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Valdes, Miyer, Juan G. Ardila, Dario Colorado, and Beatris A. Escobedo-Trujillo. "Computational Model to Evaluate the Effect of Passive Techniques in Tube-In-Tube Helical Heat Exchanger." Energies 12, no. 10 (May 18, 2019): 1912. http://dx.doi.org/10.3390/en12101912.

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The purpose of this research is to evaluate the effect of twist in the internal tube in a tube-in-tube helical heat exchanger keeping constant one type of ridges. To meet this goal, a Computational Fluid Dynamic (CFD) model was carried out. The effects of the fluid flow rate on the heat transfer were studied in the internal and annular flow. A commercial CFD package was used to predict the flow and thermal development in a tube-in-tube helical heat exchanger. The simulations were carried out in counter-flow mode operation with hot fluid in the internal tube side and cold fluids in the annular flow. The internal tube was modified with a double passive technique to provide high turbulence in the outer region. The numerical results agree with the reported data, the use of only one passive technique in the internal tube increases the heat transfer up to 28.8% compared to smooth tube.

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Veerabhadrappa, Kavadiki, K. N. Seetharamu, Chethan Kembhavi, Darshan Dayanand, Vinayakaraddy, and Rupanagudi Suresh Kumar. "Finite Element Analysis of Three-Fluid Heat Exchanger for Diesel Engine Exhaust Heat Recovery System." Applied Mechanics and Materials 592-594 (July 2014): 1607–11. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.1607.

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In internal combustion engines, only a part of the fuel energy flow is transformed into power available at the crankshaft, while the most part of the fuel energy flow is lost as coolant, exhaust gases and other waste heat flows.The focus of this study is to evaluate the performance of three-fluid re-circulating type heat exchanger to recover energy from exhaust gas The cold fluid is re-circulated to enhance the recovery of heat from the exhaust gases. Finite element model of the heat exchanger is developed based on the detailed geometry and the specific working conditions and the effectiveness of the heat exchanger is computed. Non-Dimensional parameters are introduced which makes the analysis more versatile. The effectiveness is computed for different values of NTU, Heat capacity ratios, Overall heat transfer coefficient ratio between fluid channels and the inlet temperature.

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Dı´az, Gerardo, Mihir Sen, K. T. Yang, and Rodney L. McClain. "Adaptive Neurocontrol of Heat Exchangers." Journal of Heat Transfer 123, no. 3 (January 8, 2001): 556–62. http://dx.doi.org/10.1115/1.1370512.

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This paper investigates the use of adaptive artificial neural networks (ANNs) to control the exit air temperature of a compact heat exchanger. The controllers, based on an internal model control scheme, can be adapted on-line on the basis of different performance criteria. By numerical simulation a methodology by which the weights and biases of the neural network are modified according to these criteria was developed. An ANN controller for an air-water compact heat exchanger in an experimental facility is then implemented. The parameters of the neural net are modified using three criteria: minimization of target error, stabilization of the closed-loop performance of the controller, and minimization of a performance index that we have taken to be the energy consumption. It is shown that the neural network is able to control the air exit temperature in the heat exchanger. The neurocontroller is able to adapt to major structural changes in the system as well as to simultaneously minimize the amount of energy used.

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Quan, Rui, Tao Li, Yousheng Yue, Yufang Chang, and Baohua Tan. "Experimental Study on a Thermoelectric Generator for Industrial Waste Heat Recovery Based on a Hexagonal Heat Exchanger." Energies 13, no. 12 (June 17, 2020): 3137. http://dx.doi.org/10.3390/en13123137.

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To study on the thermoelectric power generation for industrial waste heat recovery applied in a hot-air blower, an experimental thermoelectric generator (TEG) bench with the hexagonal heat exchanger and commercially available Bi2Te3 thermoelectric modules (TEMs) was established, and its performance was analyzed. The influences of several important influencing factors such as heat exchanger material, inlet gas temperature, backpressure, coolant temperature, clamping pressure and external load current on the output power and voltage of the TEG were comparatively tested. Experimental results show that the heat exchanger material, inlet gas temperature, clamping pressure and hot gas backpressure significantly affect the temperature distribution of the hexagonal heat exchanger, the brass hexagonal heat exchanger with lower backpressure and coolant temperature using ice water mixture enhance the temperature difference of TEMs and the overall output performance of TEG. Furthermore, compared with the flat-plate heat exchanger, the designed hexagonal heat exchanger has obvious advantages in temperature uniformity and low backpressure. When the maximum inlet gas temperature is 360 °C, the maximum hot side temperature of TEMs is 269.2 °C, the maximum clamping pressure of TEMs is 360 kg/m2, the generated maximum output power of TEG is approximately 11.5 W and the corresponding system efficiency is close to 1.0%. The meaningful results provide a good guide for the system optimization of low backpressure and temperature-uniform TEG, and especially demonstrate the promising potential of using brass hexagonal heat exchanger in the automotive exhaust heat recovery without degrading the original performance of internal combustion engine.

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Borowski, Marek, Michał Karch, Sławosz Kleszcz, Paweł Sala, and Grzegorz Waryan. "An experimental and numerical investigation of the thermal and non–thermal efficiency for counterflow heat exchanger." E3S Web of Conferences 128 (2019): 04008. http://dx.doi.org/10.1051/e3sconf/201912804008.

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Heating, ventilation and air conditioning systems are responsible for a significant part of total energy consumption in operated buildings. To decrease energy consumption in the near future, all buildings will have mechanical ventilation with heat recovery. In such system heat exchanger is the essential part of the system responsible for effective energy recovery from exhaust air. However, the main disadvantage of this type of unit is heat exchanger freezing during winter. To solve this issue in the present research a special air distribution system in the heat exchanger was developed. The periodic-flow unit under investigation consists of a standard counter flow heat exchanger and a set of opposing air dampers used to appropriately cyclically modify the direction of air flow through the heat exchanger. Proposed in the studies modification eliminate the negative aspect of unit freezing during the winter season as well as ensure proper air humidity. It has been found that the thermal efficiency for theheat exchanger is 83.5%. However, some internal leakage in manufactured unit occurs which artificiallyraised this parameter. The estimated value from the energy balance of was lower about 80.3%. The value of the heat exchanger efficiency falls within the range 80.3-82.8%.

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Sparrow, E. M., and J. A. Perez. "Internal, Shellside Heat Transfer and Pressure Drop Characteristics for a Shell and Tube Heat Exchanger." Journal of Heat Transfer 107, no. 2 (May 1, 1985): 345–53. http://dx.doi.org/10.1115/1.3247421.

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Per-tube heat transfer coefficients and per-compartment and intracompartment pressure drops were measured on the shell side of a shell and tube heat exchanger. The main focus of the work was to determine the response of these quantities to variations in the size of the baffle window; the Reynolds number was also varied parametrically. The pressure measurements showed that the fluid flow is fully developed downstream of the first compartment of the heat exchanger and that the per-compartment pressure drop is constant in the fully developed regime. Within a compartment, the pressure drop in the upstream half is much larger than that in the downstream half. The per-tube heat transfer coefficients vary substantially within a given compartment (on the order of a factor of two), giving rise to a nonuniform thermal loading of the tubes. Row-average and compartment-average heat transfer coefficients were also evaluated. The lowest row-average coefficients were those for the first and last rows in a compartment, while the highest coefficient is that for the row just upstream of the baffle edge. It was demonstrated that the per-tube heat transfer coefficients are streamwise periodic for a module consisting of two consecutive compartments.

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Herrera-Romero, JV, and Dario Colorado-Garrido. "Comparative Study of a Compression–Absorption Cascade System Operating with NH3-LiNO3, NH3-NaSCN, NH3-H2O, and R134a as Working Fluids." Processes 8, no. 7 (July 10, 2020): 816. http://dx.doi.org/10.3390/pr8070816.

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This research presents a comprehensive bibliographic review from 2006 through 2020 about the state of the art of the compression–absorption cascade systems for refrigeration. In consequence of this review, this research identifies the significant development of systems that consider lithium bromide as a working fluid; however, the use of other working fluids has not been developed. This study is motivated toward the development of a parametric analysis of the cascade system using NH3-LiNO3, NH3-NaSCN and NH3-H2O in the absorption cycle and R134a in the compression cycle. In this study, the effect of the heat source temperature, condensation temperature in the compression cycle, the use of heat exchangers in the system (also known as economizers) and their contribution to the coefficient of performance is deepened numerically. The economizers evaluated are the following: an internal heat exchanger, a refrigerant heat exchanger, a solution refrigerant heat exchanger, and a solution heat exchanger. Mass and energy balance equations—appropriate equations to estimate the thermophysical properties of several refrigerant–absorbent pairs—were used to develop a thermodynamic model. The studied heat source temperature range was from 355 to 380 K, and the studied condensation temperature range in the compression cycle was from 281 to –291 K; additionally, the importance of each economizer on the coefficient of performance was numerically estimated. In this way, NH3-NaSCN solution in the absorption cycle and R134a in the compression cycle provided promising numerical results with the highest COPs (coefficient of performance).

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Allymehr, Ehsan, Geir Skaugen, Torsten Will, Ángel Álvarez Pardiñas, Trygve Magne Eikevik, Armin Hafner, and Lena Schnabel. "Numerical Study of Hydrocarbon Charge Reduction Methods in HVAC Heat Exchangers." Energies 14, no. 15 (July 24, 2021): 4480. http://dx.doi.org/10.3390/en14154480.

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Required refrigerant charge in heat pump systems with propane is analyzed. Two systems are compared: the first a direct heat pump, with fin-and-tube heat exchangers, and the second an indirect system, with plate heat exchangers with an additional brine-to-air heat exchanger. Each system was considered to be able to work reversibly, with 5 kW design cooling capacity in summer and 8 kW design heating capacity in winter. Two separately developed simulation codes were used to calculate the required refrigerant charge and the efficiency of each of the systems. The charge was reduced by the use of microfinned tubes up to 22% in direct system reduced using microfinned tubes compared to the smooth tube. For the indirect system using specially designed plate heat exchangers with the minimum internal volume, their charge was reduced by up to 66% compared to normal plate heat exchangers.

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Zubair, S. M., P. V. Kadaba, and R. B. Evans. "Second-Law-Based Thermoeconomic Optimization of Two-Phase Heat Exchangers." Journal of Heat Transfer 109, no. 2 (May 1, 1987): 287–94. http://dx.doi.org/10.1115/1.3248078.

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This paper presents a closed-form analytical method for the second-law-based thermoeconomic optimization of two-phase heat exchangers used as condensers or evaporators. The concept of “internal economy” as a means of estimating the economic value of entropy generated (due to finite temperature difference heat transfer and pressure drops) has been proposed, thus permitting the engineer to trade the cost of entropy generation in the heat exchanger against its capital expenditure. Results are presented in terms of the optimum heat exchanger area as a function of the exit/inlet temperature ratio of the coolant, unit cost of energy dissipated, and the optimum overall heat transfer coefficient. The total heat transfer resistance represented by (1/U = C1 + C2 Re−n) in the present analysis is patterned after Wilson (1915) which accommodates the complexities associated with the determination of the two-phase heat transfer coefficient and the buildup of surface scaling resistances. The analysis of a water-cooled condenser and an air-cooled evaporator is presented with supporting numerical examples which are based on the thermoeconomic optimization procedure of this paper.

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Borsukiewicz-Gozdur, Aleksandra. "Exergy analysis of internal regeneration in supercritical cycles of ORC power plant." Archives of Thermodynamics 33, no. 3 (September 1, 2012): 48–60. http://dx.doi.org/10.2478/v10173-012-0017-9.

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Abstract In the paper presented is an idea of organic Rankine cycle (ORC) operating with supercritical parameters and so called dry fluids. Discussed is one of the methods of improving the effectiveness of operation of supercritical cycle by application of internal regeneration of heat through the use of additional heat exchanger. The main objective of internal regenerator is to recover heat from the vapour leaving the turbine and its transfer to the liquid phase of working fluid after the circulation pump. In effect of application of the regenerative heat exchanger it is possible to obtain improved effectiveness of operation of the power plant, however, only in the case when the ORC plant is supplied from the so called sealed heat source. In the present paper presented is the discussion of heat sources and on the base of the case study of two heat sources, namely the rate of heat of thermal oil from the boiler and the rate of heat of hot air from the cooler of the clinkier from the cement production line having the same initial temperature of 260 oC, presented is the influence of the heat source on the justification of application of internal regeneration. In the paper presented are the calculations for the supercritical ORC power plant with R365mfc as a working fluid, accomplished has been exergy changes and exergy efficiency analysis with the view to select the most appropriate parameters of operation of the power plant for given parameters of the heat source.

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Ma, Wencheng, and Lijun Liu. "Role of Internal Radiation in Oxide Crystal Growth by Heat Exchanger Method." Crystals 7, no. 1 (January 9, 2017): 18. http://dx.doi.org/10.3390/cryst7010018.

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45

Wang, Hong Li, Ning Jia, and Jing Rui Tian. "Performance Analysis of Two Stage Compression Cycle with an Internal Heat Exchanger." Applied Mechanics and Materials 540 (April 2014): 110–13. http://dx.doi.org/10.4028/www.scientific.net/amm.540.110.

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With increasing of the evaporating temperature, the two stage compression cycle with an internal exchanger’s COP has an increasing trend. In addition, R744 achieves the highest COP, and the R12 achieves the minimum level. With increasing of the high pressure and the outlet temperature of the condenser, the two stage compression cycle has a down trend. In terms of the increasing intermediate pressure, the two stage cycle with different refrigerants has different performance: R12’s COP has a downtrend with the pressure changing from 1MPa-3MPa, the rest refrigerants all increased first, and then decreased. Except for R12, they all have optimal intermediate pressure.

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Venkatesan, S. P., and E. Palaniswamy. "The Performance of the Heat Transfer in Internal Groove of Espressoheat Exchanger." Asian Journal of Research in Social Sciences and Humanities 6, no. 8 (2016): 2121. http://dx.doi.org/10.5958/2249-7315.2016.00735.8.

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47

Kim, Dae-Hoon, and Young-Chul Kwon. "Experimental Study on Cooling Performance of Internal Heat Exchanger for CO2Refrigerant System." Journal of the Korea Academia-Industrial cooperation Society 9, no. 3 (June 30, 2008): 587–92. http://dx.doi.org/10.5762/kais.2008.9.3.587.

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Xue, Gui Jun, Da Wei Liang, Guang Da Liu, Shui Qing Li, and Zhen Jiang Zhou. "Performance Analysis of Single Stage Compression Cycle with an Internal Heat Exchanger." Advanced Materials Research 753-755 (August 2013): 1401–4. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.1401.

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With the increase of outlet pressure to compressor, all cycle COP is a reducing trend except R744, in addition, R744 compression cycle has an optimum high pressure. When the inlet temperatures of compressor gradually increase, the performances of all cycles basically unchanged, but the R744 compression cycle has an increasing trend. With the increasing of outlet temperature to the condenser, the performances of all cycles are decreased; instead with increasing of the evaporating temperature, all cycle COP is an increasing trend.

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Ku, Hak-Keun. "Performance Analysis of R-1270(Propylene) Refrigeration System Using Internal Heat Exchanger." Journal of the Korea Society For Power System Engineering 18, no. 4 (August 31, 2014): 36–42. http://dx.doi.org/10.9726/kspse.2014.18.4.036.

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Kobayashi, Daisuke, Akio Funakubo, Koji Kuroiwa, Hirokazu Masuda, Toshiyuki Yaguchi, Hirohito Sumikura, and Yasuhiro Fukui. "310 Study on Internal Structure of Heat Exchanger Using Computational Fluid Dynamics." Proceedings of Ibaraki District Conference 2008 (2008): 77–78. http://dx.doi.org/10.1299/jsmeibaraki.2008.77.

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Journal articles on the topic 'Internal heat exchanger'

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