A Study on Characteristics of Cooling Heat Transfer of Supercritical Pressure Fluids in a Plate Heat Exchanger |
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| Authors: | Hideo Mori Shin Nakamura Fuka Ono Keishi Kariya Shuichi Umezawa |
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| Affiliation: | 1. Department of Mechanical Engineering, Kyushu University, Fukuoka, Japanmori@mech.kyushu-u.ac.jp;3. Mitsubishi Electric Co. Ltd., Shizouka, Japan;4. Department of Mechanical Engineering, Graduate School, Kyushu University, Fukuoka, Japan;5. Department of Mechanical Engineering, Saga University, Saga, Japan;6. R&7. D Center, Tokyo Electric Power Company, Yokohama, Japan |
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| Abstract: | For the development of industrial heat pump systems supplying a high-temperature heat source over 130°C, experiments were carried out on cooling heat transfer of supercritical pressure fluids flowing in a plate heat exchanger (PHE). Using two refrigerants of HFC134a and HCFC22 as the test fluids, heat transfer coefficient data were obtained at different pressure, flow rate, and heat load conditions. The heat transfer coefficient generally had a maximum in the vicinity of the pseudocritical point and showed seven- to ninefold values compared with tube flow. Based on the measurements, characteristics of cooling heat transfer of supercritical pressure fluids in the PHE were clarified and a correlation of heat transfer coefficient was developed. |
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