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Journal articles on the topic 'Heat exchanger effectiveness'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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1

Veerabhadrappa, Kavadiki, Dhanush Dayanand, Darshan Dayanand, Vinayakaraddy, K. N. Seetharamu, and Preadeep Hegde. "Analysis of Two Fluid Four-Channel Heat Exchanger Using Finite Element Method." Applied Mechanics and Materials 813-814 (November 2015): 658–62. http://dx.doi.org/10.4028/www.scientific.net/amm.813-814.658.

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The development of heat exchangers from two streams to multi-stream passage arrangement becomes a key problem for heat exchanger design. In this paper, a new design is developed for multi-stream (four-channel) heat exchanger. Multi-channel heat exchangers are extensively used in refrigeration and air conditioning, chemical industries, milk pasteurization, cryogenics industries and energy-recovery applications due to their higher heat transfer rates. The focus of this study is to determine the performance of four-channel counter flow heat exchanger. The hot and cold fluids are assumed to recirc

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2

Van den Bulck, E. "Optimal Design of Crossflow Heat Exchangers." Journal of Heat Transfer 113, no. 2 (1991): 341–47. http://dx.doi.org/10.1115/1.2910567.

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The design of plate-fin and tube-fin crossflow heat exchangers is discussed. The transfer surface area of crossflow heat exchangers is used ineffectively because of the nonuniform distribution of the heat transfer across the volume of the exchanger. The optimal distribution of the transfer surface area for maximum heat exchanger effectiveness and constant total surface area is determined. It is found that a Dirac delta distribution of the transfer surface aligned along the diagonal of the crossflow exchanger gives the best performance; equal to that of a counterflow device. Design guidelines f

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3

Soave, Nicolò, and Massimiliano Barolo. "On the Effectiveness of Heat-Exchanger Bypass Control." Processes 9, no. 2 (2021): 244. http://dx.doi.org/10.3390/pr9020244.

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In heat exchangers with bypassing, a fraction of the flowrate of one fluid (typically the one whose temperature needs to be controlled tightly) bypasses the exchanger and mixes right after the exchanger outlet with the fraction flowing through the exchanger. The advantages of this configuration are long known. Among them, the most significant is that it can improve heat-transfer control because the temperature dynamics is significantly faster than in a standard heat-exchanger configuration. Additionally, it can increase the rangeability of the process wherein the heat exchanger operates. Exist

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4

Hajabdollahi, Hassan. "Comparison of stationary and rotary matrix heat exchangers using teaching-learning-based optimization algorithm." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 232, no. 4 (2017): 493–502. http://dx.doi.org/10.1177/0954408917719769.

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In this paper, two kinds of compact heat exchanger including plate fin heat exchanger and rotary regenerator, respectively the stationary and rotary matrix heat exchanger, are compared. For this purpose, both heat exchangers are optimized by considering three simultaneous objective functions including effectiveness, heat exchanger volume, and total pressure drop using multi-objective teaching learning based optimization algorithm. Six different design parameters are considered for the both plate fin heat exchanger and rotary regenerator. Optimization is performed for the same and different hot

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5

K.H., Jyothiprakash, Krishnegowda Y.T., Krishna Venkataram, and K. N. Seetharamu. "Effect of ambient heat-in-leak on the performance of three-fluid cross-flow heat exchanger." International Journal of Numerical Methods for Heat & Fluid Flow 28, no. 9 (2018): 2012–35. http://dx.doi.org/10.1108/hff-05-2017-0205.

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Purpose Heat exchangers working in cryogenic temperature ranges are strongly affected by heat ingression from the ambient. This paper aims to investigate the effect of ambient heat-in-leak on the performance of a three-fluid cross-flow cryogenic heat exchanger. Design/methodology/approach The governing equations are derived for a three-fluid cross-flow cryogenic heat exchanger based on the conservation of energy principle. For given fluid inlet temperatures, the governing equations are solved using the finite element method to obtain exit temperatures of the three-fluid exchanger. The performa

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6

Rao, H. V. "Isentropic recuperative heat exchanger with regenerative work transfer." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 214, no. 4 (2000): 609–18. http://dx.doi.org/10.1243/0954406001523948.

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A counter-flow heat exchanger is considered to be the ideal method for recuperative heat transfer between hot and cold fluid streams. In this paper the concept of an isentropic heat exchanger with regenerative work transfer is developed. The overall effect is a mutual heat transfer between the two fluid streams without any net external heat or work transfers. The effectiveness for an isentropic heat exchanger with regenerative work transfer is derived for the case of fluid streams with constant specific heats and it is shown that it is greater than unity. The ‘isentropic effectiveness’ of a he

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Krisdiyanto, Krisdiyanto, Rahmad Kuncoro Adi, Sudarisman Sudarisman, and Sinin Bin Hamdan. "An analysis of tube thickness effect on shell and tube heat exchanger." Eastern-European Journal of Enterprise Technologies 1, no. 8 (109) (2021): 25–35. http://dx.doi.org/10.15587/1729-4061.2021.225334.

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Heat exchangers are important equipment for the process of placing heat. The most widely used type of heat exchanger is shell and tube. This type is widely used because of its simple and easy design. Design of shell and tube heat exchangers is done by the side or shell variations to get the desired performance. Therefore, research is conducted to study the effect of tube thickness on heat transfer, pressure drop, and stress that occurs in the shell and tube heat exchanger so that the optimal tube thickness is obtained. In this research, the activities carried out are the design of heat exchang

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8

EL_Dighidy, S., and M. Rabah. "EFFECTIVENESS OF METALLIZED-GRAPHITE HEAT EXCHANGER." International Conference on Aerospace Sciences and Aviation Technology 2, ASAT CONFERENCE (1987): 1–12. http://dx.doi.org/10.21608/asat.1987.26001.

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9

Mai, T. H., N. Chitou, and J. Padet. "Heat exchanger effectiveness in unsteady state." European Physical Journal Applied Physics 8, no. 1 (1999): 71–75. http://dx.doi.org/10.1051/epjap:1999231.

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10

Sekulic´, D. P., and I. Kmec´ko. "Three-Fluid Heat Exchanger Effectiveness—Revisited." Journal of Heat Transfer 117, no. 1 (1995): 226–29. http://dx.doi.org/10.1115/1.2822309.

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11

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 (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 constr

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12

Wang, Bohong, Jiří Jaromír Klemeš, Petar Sabev Varbanov, and Min Zeng. "An Extended Grid Diagram for Heat Exchanger Network Retrofit Considering Heat Exchanger Types." Energies 13, no. 10 (2020): 2656. http://dx.doi.org/10.3390/en13102656.

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Heat exchanger network (HEN) retrofit is a vital task in the process design to improve energy savings. Various types of heat exchangers such as shell and tube, double-pipe, compact plate, and spiral tube have their working temperature ranges and costs. Selecting suitable types of heat exchangers according to their temperature ranges and costs is a crucial aspect of industrial implementation. However, considering the type of heat exchangers in the HEN retrofit process is rarely seen in previous publications. This issue can be solved by the proposed Shifted Retrofit Thermodynamic Grid Diagram wi

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13

Azwinur, Azwinur, and Zulkifli Zulkifli. "KAJI EKSPERIMENTAL PENGARUH BAFFLE PADA ALAT PENUKAR PANAS ALIRAN SEARAH DALAM UPAYA OPTIMASI SISTEM PENGERING." SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin 13, no. 1 (2019): 8. http://dx.doi.org/10.24853/sintek.13.1.8-14.

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Heat exchangers or heat exchangers are tools used to change the temperature of the fluid or change the fluid phase by exchanging heat with another fluid. In a heat exchanger, the ability to exchange heat is largely determined by the type of fluid flow and fluid passing through the heat exchanger. The use of heat exchangers in the field of drying is now a necessity to overcome the problems of drying productivity. The purpose of this study was carried out to determine the effectiveness of the heat exchanger experimentally based on directional flow by comparing construction using baffle and witho

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14

Frain, Matthew J., David P. Schmidt, and Woodrow A. Fiveland. "An Experimental Investigation of the Influence of Gas and Solid Particle Interaction on the Heat Transfer Effectiveness of a Falling-Bed Heat Exchanger." Journal of Heat Transfer 127, no. 10 (2005): 1077–86. http://dx.doi.org/10.1115/1.2033904.

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The objective of this investigation is to quantify and understand the performance of falling-bed heat exchangers. Experimental steady-state heat transfer data, whose quality is demonstrated with an accurate energy balance between the gas and particle streams, are presented. Measured temperatures, pressures, and overall heat transfer rates are compared to predicted values from a one-dimensional analytical model, and the capabilities and deficiencies of the model are discussed. In addition, the effect of a particle distributor on the performance of the falling-bed heat exchanger is measured. Whi

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Hu, Ping Fang, Zhong Yi Yu, Fei Lei, Na Zhu, Qi Ming Sun, and Xu Dong Yuan. "Performance Evaluation of a Vertical U-Tube Ground Heat Exchanger Using a Numerical Simulation Approach." Advanced Materials Research 724-725 (August 2013): 909–15. http://dx.doi.org/10.4028/www.scientific.net/amr.724-725.909.

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A vertical U-tube ground heat exchanger can be utilized to exchange heat with the soil in ground source heat pump systems. The outlet temperature of the working fluid through the U-tube not only accounts for heat transfer capacity of a ground heat exchanger, but also greatly affects the operational efficiency of heat pump units, which is an important characteristic parameter of heat transfer process. It is quantified by defining a thermal effectiveness coefficient. The performance evaluation is performed with a three dimensional numerical model using a finite volume technique. A dynamic simula

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16

Nellis, Gregory F. "Effectiveness-NTU Relations for Heat Exchangers With Streams Having Significant Kinetic Energy Variation." Journal of Heat Transfer 125, no. 2 (2003): 377–87. http://dx.doi.org/10.1115/1.1560154.

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Effectiveness-NTU equations are derived for counter and parallel-flow heat exchangers with fluids having high velocities. In this case, the change in the kinetic energy occurring within the heat exchanger will significantly affect the temperature profiles. The effectiveness is found to depend on the usual non-dimensional variables that compare the heat exchanger conductance to the hot- and cold-side capacity rates and on four additional nondimensional quantities that reflect the magnitude and distribution of the kinetic energy on the hot and cold-sides of the heat exchanger. The governing diff

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17

Siegele, Dietmar, and Fabian Ochs. "Effectiveness of a membrane enthalpy heat exchanger." Applied Thermal Engineering 160 (September 2019): 114005. http://dx.doi.org/10.1016/j.applthermaleng.2019.114005.

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18

Yang, Kai-Shing, Ming-Yean Jiang, Chih-Yung Tseng, Shih-Kuo Wu, and Jin-Cherng Shyu. "Experimental Investigation on the Thermal Performance of Pulsating Heat Pipe Heat Exchangers." Energies 13, no. 1 (2020): 269. http://dx.doi.org/10.3390/en13010269.

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In this study, the vertically-oriented pulsating heat pipe (PHP) heat exchangers charged with either water or HFE-7000 in a filling ratio of 35% or 50% were fabricated to exchange the thermal energy between two air streams in a parallel-flow arrangement. Both the effectiveness of the heat exchangers and the thermal resistance of PHP with a size of 132 × 44 × 200 mm, at a specific evaporator temperature ranging from 55 to 100 °C and a specific airflow velocity ranging from 0.5 to 2.0 m/s were estimated. The results show that the heat pipe charged with HFE-7000 in either filling ratio is likely

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19

Shah, Ramesh K., and Teodor Skiepko. "Exchanger Performance Behavior Through Irreversibility Analysis for 1-2 TEMA G Heat Exchangers." Journal of Heat Transfer 127, no. 12 (2005): 1296–304. http://dx.doi.org/10.1115/1.2098827.

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The objective of this paper is to illustrate, discuss, and explain the interrelationship between the temperature difference irreversibility and heat exchanger effectiveness to clarify the performance trends of exchangers with some complex flow arrangements. This is because there is no physical explanation provided for the following results presented by Shah and Skiepko (ASME J. Heat Transfer, 126, pp. 994–1002, 2004): the heat exchanger effectiveness can be maximum, having an intermediate value or minimum at the maximum irreversibility operating point depending upon the flow arrangement of two

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20

Nasif, Mohammad Shakir, and Rafat Al-Waked. "Effect of Air to Air Fixed Plate Enthalpy Energy Recovery Heat Exchanger Flow Profile on Air Conditioning System Energy Recovery." Applied Mechanics and Materials 819 (January 2016): 245–49. http://dx.doi.org/10.4028/www.scientific.net/amm.819.245.

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Fixed plate enthalpy heat exchanger which utilizes permeable material as heat and moisture transfer surface has been used as an energy recovery system to recover sensible and latent heat in HVAC systems. The heat exchanger effectiveness is affected by the air flow profile. It is well known that counter flow configuration provides highest effectiveness, however, in real applications, it is not possible to implement a counter flow configuration, as both inlet and outlet ducts of the two flow streams are located on the same side of the heat exchanger. Therefore, several quasi-counter-flow heat ex

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21

KUBIS, Vjacheslav Aleksandrovich, Svetlana Viktorovna BAKANOVA, Alexandr Ivanovich EREMKIN, and Natalia Aleksandrovna ORLOVA. "EVALUATION OF AIR HEATING SYSTEMS EFFECTIVENESS IN GREENHOUSES." Urban construction and architecture 4, no. 2 (2014): 94–98. http://dx.doi.org/10.17673/vestnik.2014.02.15.

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The results of experimental studies of gas-air heat exchanger of solid fuel stove are viewed. Work modes of air heating system in the greenhouse are measured. Work modes of stove and gas-air heat exchanger are analyzed. Dependence between air temperature from heat exchanger and heating mode is established.

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22

Rabczak, Sławomir, and Paweł Kut. "Analysis of Yearly Effectiveness of a Diaphragm Ground Heat Exchanger Supported by an Ultraviolet Sterilamp." Energies 13, no. 11 (2020): 2804. http://dx.doi.org/10.3390/en13112804.

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Ground heat exchangers supplement ventilation systems and provide notable power gains by heating ventilated air during winter and cooling it in summer. Additionally, they prevent recuperator exchangers from freezing. In atmospheric air, there are many types of contaminants and microorganisms that significantly affect the quality of ventilated air. The air that flows through the system of pipes of the heat exchanger may also become contaminated. In order to remove contamination from ventilated air, ultraviolet radiation may be used. This article presents a concept of using a UV-C (ultraviolet w

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23

Shi, Chengming, Yang Wang, Ying Yang, and Quan Liao. "Heat transfer effectiveness of three-fluid separated heat pipe exchanger." Journal of Thermal Science 20, no. 1 (2011): 64–69. http://dx.doi.org/10.1007/s11630-011-0436-y.

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24

LEE, EUL-JONG, JUNG-PYO LEE, HYUN-MIN SIM, and NAE-HYUN KIM. "MODELING AND VERIFICATION OF HEAT AND MOISTURE TRANSFER IN AN ENTHALPY EXCHANGER MADE OF PAPER MEMBRANE." International Journal of Air-Conditioning and Refrigeration 20, no. 03 (2012): 1250015. http://dx.doi.org/10.1142/s2010132512500150.

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In this study, heat and moisture transfer model of an enthalpy exchanger is proposed. With separately measured sorption constant and diffusion coefficient, the model predicts the heat and moisture transfer effectiveness of an enthalpy exchanger. Two sample enthalpy exchangers were tested at a KS condition to verify the model. The model predicts the heat transfer effectiveness within 4%, and the moisture transfer effectiveness within 10%. Pressure drop is predicted within 6%. The spacer fin efficiency for heat transfer was 0.11 to 0.13. The fin efficiency for moisture transfer, however, was neg

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Jithendra Sai RajaChada, Jithendra Sai Raja, Akhil Yuvaraj Manda, Venkat Sandeep Gadi, and Ramasamy Dharmalingam. "Experimental Study of a Concentric Tube Heat Exchanger with Helical Baffle Using CFD." Technical Journal of Daukeyev University 1, no. 1 (2021): 32–38. http://dx.doi.org/10.52542/tjdu.1.1.32-38.

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Heat exchangers are the most common equipment used to transfer heat from high-temperature fluid to low-temperature fluid without direct contact. The present study considers the analytical approach on a concentric tube heat exchanger with the helical baffle. The objective of the study is to reduce the size with effect to increase the effectiveness of the heat exchanger. A heat exchanger with 100 mm external diameter and 560 mm length contains a helical baffle with 20 degrees inclination. The designed heat exchanger is analysed by varying the mass flow rate of hot water from 0.25 Kg/s to 2 Kg/s

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Ebieto, C. E., R. R. Ana, O. E. Nyong, and E. G. Saturday. "Design and Construction of a Double Pipe Heat Exchanger for Laboratory Application." European Journal of Engineering Research and Science 5, no. 11 (2020): 1301–6. http://dx.doi.org/10.24018/ejers.2020.5.11.1950.

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Engineering education is incomplete without laboratory practices. One of such laboratory equipment necessary for all engineering students to have hands-on in the course of their undergraduate studies is the heat exchanger. This work presents the detailed design and construction of a laboratory type double pipe heat exchanger that can be used both in the parallel and counter flow configuration. The heat exchanger was constructed using galvanized steel for both the tube and shell. Experiments were designed and carried out to test the performance of the heat exchangers. The heat exchanger perform

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Silaipillayarputhur, Karthik, and Tawfiq Al-Mughanam. "Performance of Pure Crossflow Heat Exchanger in Sensible Heat Transfer Application." Energies 14, no. 17 (2021): 5489. http://dx.doi.org/10.3390/en14175489.

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All process industries involve the usage of heat exchanger equipment and understanding its performance during the design phase is very essential. The present research work specifies the performance of a pure cross flow heat exchanger in terms of dimensionless factors such as number of transfer units, capacity rate ratio, and heat exchanger effectiveness. Steady state sensible heat transfer was considered in the analysis. The matrix approach that was established in the earlier work was used in the study. The results were depicted in the form of charts, tables, and performance equations. It was

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Kumar, Mohan, S. C. Kaushik, and S. N. Garg. "Thermodynamic performance evaluation of an air-air heat pipe heat exchanger." Thermal Science 18, no. 4 (2014): 1343–53. http://dx.doi.org/10.2298/tsci121214123k.

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In this paper, heat transfer analysis for an air-air heat exchanger was experimentally carried out to find its thermal performance and effectiveness. Air-air heat exchanger equipped with finned heat pipes was considered for the experimentation. Mass flow rate of air was considered in between 0.24 to 0.53 [kg/sec]. The temperature at the condenser side of the heat pipe heat exchanger was kept constant at around 23 [?C] and at the evaporator part it was varied from 88 to 147 [?C]. The performance of heat pipe heat exchanger was evaluated at different mass flow rate of air, in terms of effectiven

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Górecki, Grzegorz, Marcin Łęcki, Artur Norbert Gutkowski, et al. "Experimental and Numerical Study of Heat Pipe Heat Exchanger with Individually Finned Heat Pipes." Energies 14, no. 17 (2021): 5317. http://dx.doi.org/10.3390/en14175317.

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The present study is devoted to the modeling, design, and experimental study of a heat pipe heat exchanger utilized as a recuperator in small air conditioning systems (airflow ≈ 300–500 m3/h), comprised of individually finned heat pipes. A thermal heat pipe heat exchanger model was developed, based on available correlations. Based on the previous experimental works of authors, refrigerant R404A was recognized as the best working fluid with a 20% heat pipe filling ratio. An engineering analysis of parametric calculations performed with the aid of the computational model concluded 20 rows of fin

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Vukic, Mica, Mladen Tomic, Predrag Zivkovic, and Gradimir Ilic. "Effect of segmental baffles on the shell-and-tube heat exchanger effectiveness." Chemical Industry 68, no. 2 (2014): 171–77. http://dx.doi.org/10.2298/hemind130127041v.

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In this paper, the results of the experimental investigations of fluid flow and heat transfer in laboratory experimental shell-and-tube heat exchanger are presented. Shell-and-tube heat exchanger is with one pass of warm water on the shell side and two passes of cool water in tube bundle. Shell-and-tube heat exchanger is with 24x2 tubes (U-tube) in triangle layout. During each experimental run, the pressure drops and the fluid temperatures on shell side, along the shell-and-tube heat exchanger (at positions defined in advance) have been measured. Special attention was made to the investigation

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Wijeysundera, N. E., J. C. Ho, and S. Rajasekar. "The effectiveness of a spiral coil heat exchanger." International Communications in Heat and Mass Transfer 23, no. 5 (1996): 623–31. http://dx.doi.org/10.1016/0735-1933(96)00045-0.

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Leibovici, C. F. "An efficient solution for crossflow heat exchanger effectiveness." Computers & Chemical Engineering 17, no. 12 (1993): 1209–11. http://dx.doi.org/10.1016/0098-1354(93)80100-2.

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Xiong, Daxi, Zhixin Li, and Zengyuan Guo. "On effectiveness and entropy generation in heat exchanger." Journal of Thermal Science 5, no. 4 (1996): 248–56. http://dx.doi.org/10.1007/bf02653231.

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Ruan, Deng-Fang, Xiao-Feng Yuan, Shuang-Ying Wu, and You-Rong Li. "Exergy Effectiveness Analysis of Three-Fluid Heat Exchanger." Journal of Superconductivity and Novel Magnetism 23, no. 6 (2010): 1127–31. http://dx.doi.org/10.1007/s10948-010-0680-5.

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Tomic, Mladen, Predrag Zivkovic, Mica Vukic, Velimir Stefanovic, and Sadoon Ayed. "The analysis of the matrix heat exchanger effectiveness." Savremene tehnologije 4, no. 1 (2015): 89–93. http://dx.doi.org/10.5937/savteh1501089t.

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Agarwal, Abhishek. "Modelling & Numerical Investigation of the Effectiveness of Plate Heat Exchanger for Cooling Engine Oil Using ANSYS CFX." International Journal of Heat and Technology 39, no. 2 (2021): 653–58. http://dx.doi.org/10.18280/ijht.390237.

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Heat exchangers are used for various industrial application for transfer of enthalpy from hot fluid to cold. One of them is Plate Heat Exchanger which finds its application in evaporating systems. The compactness, high effectiveness and easy maintenance of Plate Heat Exchanger makes it best choice for process industries. The current research investigates the application of Plate Heat Exchanger in cooling of engine oil using techniques of Computational Fluid Dynamics for low, medium and high Reynolds number using ANSYS CFX software. The CAD model is developed using Creo design software and turb

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Denkenberger, David, Joshua M. Pearce, Michael Brandemuehl, Mitchell Alverts, and John Zhai. "Expanded Microchannel Heat Exchanger: Finite Difference Modeling." Designs 5, no. 4 (2021): 58. http://dx.doi.org/10.3390/designs5040058.

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A finite difference model of a heat exchanger (HX) considered maldistribution, axial conduction, heat leak, and the edge effect, all of which are needed to model a high effectiveness HX. An HX prototype was developed, and channel height data were obtained using a computerized tomography (CT) scan from previous work along with experimental results. This study used the core geometry data to model results with the finite difference model, and compared the modeled and experimental results to help improve the expanded microchannel HX (EMHX) prototype design. The root mean square (RMS) error was 3.8

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Bogdan, Claudia, Catalin Brill, Oleksandr Sirosh, Mihai Vijulie, and Alin Lazar. "PRELIMINARY DEVELOPMENT OF A CONCEPTUAL MODEL OF MATRIX HEAT EXCHANGER." SMART ENERGY AND SUSTAINABLE ENVIRONMENT 24, no. 1 (2021): 29–40. http://dx.doi.org/10.46390/j.smensuen.24121.435.

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While the basic principles of thermodynamics have remained the same, the necessity for heat exchangers to have good effectiveness in a small volume is constantly growing. Heat exchangers type Matrix Heat Exchanger (MHE), which can meet these requirements, does not have an optimal design variant for its use. These heat exchangers have been approached for 60 years, by many researchers, currently offering only an overview of the process. The mechanism of heat transfer in a matrix heat exchanger is complex, having three different thermal convection paths as well as thermal conduction through two d

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Md Noor, Mohd Rahimie, Nur Syafiqah Hidayah Mohd Fauzi, Siti Nur Fadhilah Masrom, Mohd Azry Abdul Malek, Muhammad Firdaus Mustapha, and Ahmad Bukhari Mohd Yasin. "Graphing Behaviour of Heat Transfer In Terms of Nusselt and Reynolds." Journal of Computing Research and Innovation 6, no. 2 (2021): 41–52. http://dx.doi.org/10.24191/jcrinn.v6i2.198.

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Heat exchangers are tools used to transfer thermal energy between two fluids (liquid or gas) by convection and conduction at different level of temperatures. Heat exchangers are the common equipment and employed in many different applications because of ability to withstand high temperatures and compactness. There are no intermixing or leakage occurred between two fluids during the heat transfer process as fluids are separated by walls of heat exchanger. The main objective of this project is to determine the heat exchanger effectiveness in heat transfer performance. This will be done by invest

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Nasution, A. H., P. G. Sembiring, and H. Ambarita. "Effectiveness of a heat exchanger in a heat pump clothes dryer." IOP Conference Series: Materials Science and Engineering 308 (February 2018): 012027. http://dx.doi.org/10.1088/1757-899x/308/1/012027.

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Kareemullah, Mohammed, K. M. Chethan, Mohammed K. Fouzan, et al. "Heat Transfer Analysis of Shell and Tube Heat Exchanger Cooled Using Nanofluids." Recent Patents on Mechanical Engineering 12, no. 4 (2019): 350–56. http://dx.doi.org/10.2174/2212797612666190924183251.

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Background:: In Shell and Tube Heat Exchanger (STHX), heat is exchanged between hot water (coming from industrial outlet by forced convection) to the cold water. Instead of water, if Nano fluids are used into these tubes, then there is a possibility of improved heat transfer because of high thermal conductivity of the nanofluids. Objective:: From many literature and patents, it was clear that the study of STHX using metal oxide nanoparticles is very scarce. Therefore, the objective of the present investigation is to check the thermal performance of STHX operated with zinc oxide nanofluid and c

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LEIGHTON, DANIEL, YUNHO HWANG, and REINHARD RADERMACHER. "COMPACT BRAZED PLATE HEAT EXCHANGERS FOR CO2 HEAT PUMP WATER HEATERS." International Journal of Air-Conditioning and Refrigeration 18, no. 04 (2010): 289–95. http://dx.doi.org/10.1142/s2010132510000265.

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The plate-type heat exchanger is found to be well suited for the application of a transcritical CO2 heat pump water heater. A CO2 heat pump water heater test facility was used to evaluate the performance of a high-pressure plate-type heat exchanger. The performance characteristics of heat exchanger effectiveness, capacity, and pressure drop were evaluated over a range of CO2 gas cooler inlet pressures and temperatures. For the ambient temperature range of 10°C to 30°C, the maximum observed capacities ranged from 4.46 kW to 5.34 kW, with the capacity increasing approximately linearly with incre

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Azim Aijaz, Mohammad, and T. S. Ravikumar. "Design and Analysis of a Heat Exchanger Network." Material Science Research India 9, no. 1 (2012): 85–91. http://dx.doi.org/10.13005/msri/090111.

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the hot fluid outlet temperature, cold fluid outlet temperature, heat transfer rate and effectiveness at varying hot and cold fluid inlet temperatures using, log mean temperature difference (LMTD) and effectiveness-number of transfer units (ε-NTU) method. The obtained result illustrates how heat transfer rate and effectiveness increases or decreases at varying hot and cold fluid inlet temperatures. The result obtained from both LMTD and å-NTU method gives statistically significant values. The objective of this paper is to find out the optimal temperature at which heat transfer rate and effecti

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Valchev, Slav, and Ivan Mihaylov. "Analysis of energy efficiency of air handling unit with integrated air to air heat exchanger in heating mode." E3S Web of Conferences 207 (2020): 01002. http://dx.doi.org/10.1051/e3sconf/202020701002.

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Object of the present study is an experimental determination of energy efficiency parameters of air handling unit with integrated air to air heat exchanger: effectiveness of air to air heat exchanger, coefficient of performance and specific fan power of air handling unit. A daily performance of air handling unit is conducted. Effectiveness of supply side of air to air heat exchanger in range of 42.4 % to 52.5 % is received. Coefficient of performance in range of 1.50 to 2.08 and specific fan power of air handling unit in range of 1.39 kW/(m3/s) to 2.08 kW/(m3/s) are received. It was found expe

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Timerbaev, N. F., A. K. Ali, Omar Abdulhadi Mustafa Almohamed, and A. R. Koryakin. "Simulation of the effectiveness of longitudinal rectangular fins on the efficiency of the double pipe heat exchanger." Power engineering: research, equipment, technology 21, no. 4 (2019): 48–57. http://dx.doi.org/10.30724/1998-9903-2019-21-4-48-57.

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In this article, a mathematical simulation of a double pipe heat exchanger is carried out, having the longitudinal rectangular fins with the dimension of (2*3*1000) mm, mounted on the outer surface of the inner tube of the heat exchanger. In this paper, the advantage of using of that type of fins and its effect on the effectiveness of the heat exchanger are studied with the help of the computer program. The carried out research allowsmaking the calculation to find the optimum design parameters of heat exchangers. The outer tube diameter is (34.1mm) while the inner tube diameter is (16.05mm). T

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Kulacki, F. A., Jane H. Davidson, and M. Hebert. "On the Effectiveness of Baffles in Indirect Solar Storage Systems." Journal of Solar Energy Engineering 129, no. 4 (2007): 494–98. http://dx.doi.org/10.1115/1.2770757.

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Parameters that control heat transfer and mixing in energy extraction from indirect solar storage tanks that employ an immersed heat exchanger with a straight baffle beneath are identified and estimated. The analysis of flow in the baffle is based on boundary layer theory and provides insight into the effectiveness of a baffle in controlling growth of the thermal plume from the heat exchanger. The important physical mechanisms are the restricted entrainment and heat transfer to the storage fluid. For an adiabatic baffle as a base case, key design factors are the point of attachment of the plum

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Nwokolo, Nwabunwanne, Patrick Mukumba, and KeChrist Obileke. "Thermal Performance Evaluation of a Double Pipe Heat Exchanger Installed in a Biomass Gasification System." Journal of Engineering 2020 (August 1, 2020): 1–8. http://dx.doi.org/10.1155/2020/6762489.

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Heat exchangers are widely used for heat recovery purposes in many industrial applications such as gasification systems. In a biomass gasification system situated at Melani village in Eastern Cape of South Africa, a significant quantity of heat energy is lost during syngas cooling. Thus, a heat exchanger was constructed and installed in the gasification system for the purpose of heat recovery. Therefore, the aim of this study is to evaluate the performance of the heat exchanger under variable operating conditions for counterflow and parallel flow configurations. The experimental investigation

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Yau, YH, and M. Ahmadzadehtalatapeh. "The empirical study of a four-row heat pipe heat exchanger to predict the year-round energy recovery in the tropics." Building Services Engineering Research and Technology 32, no. 4 (2011): 307–27. http://dx.doi.org/10.1177/0143624410397919.

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The effect of heat pipe heat exchanger on the heat recovery was studied in the tropics. The performance of the heat exchanger was monitored during the one week of operation (168 h) to find out the performance characteristic curves. Three coil face velocities namely, 2, 2.2 and 2.5 m/s were tested and the temperature of return air was controlled at 24°C. The relevant empirical equations were then employed for the hour-by-hour prediction of the energy recovery by the heat pipe heat exchanger for the whole year. The impact of inside design temperature on the heat recovery by the heat exchanger wa

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Shahrul, Islam Md, I. M. Mahbubul, Rahman Saidur, Mohd Faizul Mohd Sabri, Muhammad Afifi Amalina, and S. S. Khaleduzzaman. "Global Effects of MWCNT-W Nanofluid in a Shell & Tube Heat Exchanger." Advanced Materials Research 832 (November 2013): 154–59. http://dx.doi.org/10.4028/www.scientific.net/amr.832.154.

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Global warming and other problems can be reduced by effectively using the available materials and facilities. Heat exchangers play an important part of the field of energy conservation, conversion and recovery. Shell & tube heat exchangers are widely using in industrial processes and power plants. Suspension of small amounts of nanoparticles into the base fluid called nanofluid can reduce the global energy losses. Thermal conductivity of Multi Walled Carbon Nanotube (MWCNT) is highest among the different nano materials [1]. Therefore, in this paper, the overall performance of a shell &

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Pignotti, A. "Linear Matrix Operator Formalism for Basic Heat Exchanger Thermal Design." Journal of Heat Transfer 110, no. 2 (1988): 297–303. http://dx.doi.org/10.1115/1.3250483.

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The matrix formalism used for the thermal description of heat exchangers is extended to include streams with variable temperature distributions. In this approach, a heat exchanger is described by a temperature-independent matrix operator, which, acting on the inlet temperature distributions, generates the outlet ones. This formalism is particularly useful for the evaluation of the thermal effectiveness of complex heat exchanger configurations that can be broken into simple constitutive parts, linked to each other by unmixed streams. Applications to crossflow configurations of practical interes

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