Numerical analysis on a microchannel evaporator designed for CO2 air-conditioning systems |
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| Affiliation: | 1. Department of Mechanical Engineering, Hanbat National University, San16-1, Duckmyung-dong, Yuseong-gu, Daejeon 305-719, Republic of Korea;2. Department of Mechanical Engineering, Korea University, Anam-dong, Sungbuk-ku, Seoul 136-701, Republic of Korea;1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, No. 11, Beisihuanxi Road, Beijing 100190, PR China;2. University of Chinese Academy of Sciences, No. 19(A), Yuquan Road, Beijing 100049, PR China;3. Dalian National Laboratory for Clean Energy, No. 457, Zhongshan Road, Dalian 116000, PR China;1. Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China;2. Air Conditioning and Refrigeration Center, Department of Mechanical Engineering, University of Illinois at Urbana Champaign, 1206 West Green Street, Urbana, IL 61801, USA;1. Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180, United States;2. Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180, United States;1. School of Material and Energy, Guangdong University of Technology, Guangzhou 510006, China;2. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640, China |
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| Abstract: | A microchannel heat exchanger was numerically analyzed using the finite volume method. The air and refrigerant-side heat transfer coefficients and pressure drops were calculated using the existing correlations that were developed for microchannel heat exchangers. To verify the present model, performance tests of the microchannel heat exchanger were conducted at various test conditions with R134a. The present model yielded a good correlation with the measured heat transfer rate, demonstrating a mean deviation of 6.8%. The performance of the microchannel evaporator for CO2 systems can be improved by varying the refrigerant flow rate to each slab and changing fin space to increase the two-phase region in the microchannel. Based on the comparison of the performance of the microchannel heat exchanger with that of the fin-tube heat exchanger designed for CO2 systems, it was proposed that the arrangement of the slabs and inlet air velocity in the microchannel heat exchanger need to be optimized by considering heat exchanger size, air outlet conditions and required capacity. |
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