Theoretical thermal performance of cross-flow finned heat pipe heat exchanger used for air conditioning in surgery rooms
Abstract
The thermal efficiency of heat exchangers was applied for theoretical analysis of the thermal performance of a finned heat pipe heat exchanger (FHPHE) used as an auxiliary device to control the temperature and quality of the air conditioning in operating rooms. The theoretical analysis performed is punctual and distributed. It is divided into three aspects: analysis of the evaporator section, analysis of the condenser section, and analysis of the heat exchanger in terms of overall performance. The distributed procedure contrasts with the theoretical-experimental study, which uses the concept of thermal effectiveness (ε-NTU) for global heat exchanger analysis. The developed approach considers the number of heat pipes, the number of fins, and the flow rate variation at the inlet of the heat exchanger as fundamental parameters for determining the thermophysical quantities of interest. Theoretical values were determined for the average velocities, Nusselt numbers, thermal effectiveness, heat transfer rates, and exit temperatures. The localized theoretical-experimental comparisons are consistent, and the absolute relative error for the global heat transfer rate ranges from 0.5% to 35%.
References
Sukarno R, Putra N, Hakim II, et al. Multi-stage heat-pipe heat exchanger for improving energy efficiency of the HVAC system in a hospital operating room. International Journal of Low-Carbon Technologies 2021; 16(2): 259–267. doi: 10.1093/ijlct/ctaa048
Hakim II, Sukarno R, Putra N. Utilization of U-shaped finned heat pipe heat exchanger in energy-efficient HVAC systems. Thermal Science and Engineering Progress 2021; 25: 100984. doi: 10.1016/j.tsep.2021.100984
Putra NSD, Anggoro T, Winarta A. Experimental study of heat pipe heat exchanger in hospital HVAC system for energy conservation. International Journal of Advance Science Engineering Information Technology 2017; 7(3): 871–877. doi: 10.18517/ijaseit.7.3.2135
Barrak A. Heat Pipes Heat Exchanger for HVAC Applications. IntechOpen; 2021.
Stewart SW, Shelton SV, Aspelund KA. Finned tube heat exchanger optimization methodology. In: Proceedings of the 2nd International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics; 23–26 June 2003, Victoria Falls, Zambia.
Nogueira E. Thermo-hydraulic optimization of shell and externally finned tubes heat exchanger by the thermal efficiency method and second law of thermodynamics. International Journal of Chemical and Process Engineering Research 2022; 9(1): 21–41. doi: 10.18488/65.v9i1.3130
Górecki G, Łęcki M, Gutkowski AN, et al. Experimental and numerical study of heat pipe heat exchanger with individually finned heat pipes. Energies 2021; 14(17): 5317. doi: 10.3390/en14175317
Jouhara H, Chauhan A, Nannou T, et al. Heat pipe based systems—Advances and applications. Energy 2017; 128: 729–754. doi: 10.1016/j.energy.2017.04.028
Jouhara H, Almahmoud S, Brough D, et al. Experimental and theoretical investigation of the performance of an air to water multi-pass heat pipe-based heat exchanger. Energy 2021; 219: 119624. doi: 10.1016/j.energy.2020.119624
Rohsenow WM. A method of correlating heat transfer data for surface boiling of liquids. Transactions of the American Society of Mechanical Engineers 1952; 74(6): 969–975. doi: 10.1115/1.4015984
Fakheri A. Heat exchanger efficiency. AMSE Journal of Heat and Mass Transfer 2007; 129(9): 1268–1276. doi: 10.1115/1.2739620
Nogueira É. Thermal performance in heat exchangers by the irreversibility, effectiveness, and efficiency concepts using nanofluids. Journal of Engineering Sciences 2020; 7(2): F1–F7. doi: 10.21272/jes.2020.7(2).f1
Copyright (c) 2023 Élcio Nogueira
This work is licensed under a Creative Commons Attribution 4.0 International License.
Authors contributing to this journal agree to publish their articles under the Creative Commons Attribution 4.0 International License, allowing third parties to share their work (copy, distribute, transmit) and to adapt it for any purpose, even commercially, under the condition that the authors are given credit. With this license, authors hold the copyright.
