Heat pipe heat exchanger for heat recovery in air conditioning |
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| Affiliation: | 1. David Reay & Associates, PO Box 25, Whitley Bay, Tyne & Wear NE26 1QT, UK.;2. Department of Mechanical, University of Illinois at Chicago, 842 West Taylor Street, Chicago, IL 60607-7022;3. Universitá Tor Vergata Roma, Italy;4. Universitá di Pisa, Italy;5. University of Minnesota, United States.;1. Engineering Research Center of Fujian University for Marine Intelligent Ship Equipment, Minjiang University, Fuzhou 350108, China;2. School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, NSW 2522, Australia;3. School of Engineering, Deakin University, Waurn Ponds, Victoria, Australia;4. School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, SA 5005, Australia;5. Department of Mechanical Engineering Technology, Yanbu Industrial College, Yanbu Al-Sinaiyah City 41912, Kingdom of Saudi Arabia;6. Department of Mechanical and Industrial Engineering, College of Engineering, Majmaah University, Al-Majmaah 11952, Saudi Arabia;7. Department of Mechatronics and System Engineering, College of Engineering, Majmaah University, Al-Majmaah 11952, Saudi Arabia;8. Sustainable Management of Natural Resources and Environment Research Group, Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Vietnam;9. Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam;10. Faculty of Electrical-Electronic Engineering, Duy Tan University, Da Nang 550000, Vietnam;11. NAAM Research Group, Department of Mathematics, Faculty of Science, King Abdulaziz University, Jeddah P.O. Box 80259, Saudi Arabia;1. Institute of Energy Futures, RCUK Centre for Sustainable Energy Use in Food Chains (CSEF), College of Engineering, Design and Physical Sciences, Brunel University London, Uxbridge UB8 3PH, UK;2. Institute of Materials and Manufacturing, College of Engineering, Design and Physical Sciences, Brunel University London, Uxbridge UB8 3PH, UK;1. College of Engineering, Design and Physical Sciences, Brunel University London, Uxbridge, London, UB8 3FG, UK |
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| Abstract: | The heat pipe heat exchangers are used in heat recovery applications to cool the incoming fresh air in air conditioning applications. Two streams of fresh and return air have been connected with heat pipe heat exchanger to investigate the thermal performance and effectiveness of heat recovery system. Ratios of mass flow rate between return and fresh air of 1, 1.5 and 2.3 have been adapted to validate the heat transfer and the temperature change of fresh air. Fresh air inlet temperature of 32–40 °C has been controlled, while the inlet return air temperature is kept constant at about 26 °C. The results showed that the temperature changes of fresh and return air are increased with the increase of inlet temperature of fresh air. The effectiveness and heat transfer for both evaporator and condenser sections are also increased to about 48%, when the inlet fresh air temperature is increased to 40 °C. The effect of mass flow rate ratio on effectiveness is positive for evaporator side and negative for condenser side. The enthalpy ratio between the heat recovery and conventional air mixing is increased to about 85% with increasing fresh air inlet temperature. The optimum effectiveness of heat pipe heat exchanger is estimated and compared with the present experimental data. The results showed that the effectiveness is close to the optimum effectiveness at fresh air inlet temperature near the fluid operating temperature of heat pipes. |
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