Experimental study on the performance of a simultaneous heating and cooling multi-heat pump with the variation of operation mode |
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| Authors: | Hoon Kang Youngju Joo Hyunjoon Chung Yongchan Kim Jongmin Choi |
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| Affiliation: | aDepartment of Mechanical Engineering, Korea University, Anam-Dong, Sungbuk-Ku, Seoul 136-713, Republic of Korea;bDepartment of Mechanical Engineering, Hanbat National University, Duckmyung-Dong, Yusung-Ku, Daejeon 305-719, Republic of Korea |
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| Abstract: | The cooling load in the winter season becomes significant in commercial buildings and hotels because of the wide usage of office equipment and improved wall insulation. In this study, a simultaneous heating and cooling multi-heat pump having four indoor units and an outdoor unit was designed and tested in five operation modes: cooling-only, heating-only, cooling-main, heating-main, and entire heat recovery. The performance of the system with R410a was optimized by adjusting the system's control parameters. In the cooling-main mode, the rate of the bypass flow to the heating-operated indoor unit was optimized by controlling the EEV opening of the outdoor unit. In the heating-main mode, the mass flow rate to the cooling-operated indoor unit was optimized by adjusting the EEV opening in the outdoor unit. In the entire heat recovery mode, the compressor speed was controlled to improve the system COP with appropriate heating and cooling capacities. |
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| Keywords: | Heat pump R410A Experiment Heating Cooling Optimization Electronic expansion valve Variable speed CompressorMots clé s: Pompe à chaleur R410A Expé rimentation Chauffage Ré frigé ration Optimisation Dé tendeur é lectronique Vitesse variable Compresseur |
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