Frost retardation of an air-source heat pump by the hot gas bypass method |
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Authors: | Ju-Suk Byun Jinho Lee Chang-Duk Jeon |
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Affiliation: | aYonsei Center for Clean Technology, Yonsei University, Seoul 120-749, Republic of Korea;bSchool of Mechanical Engineering, Yonsei University, Seoul 120-749, Republic of Korea;cDepartment of Mechanical Engineering, Chungju National University, Chung-Buk 380-702, Republic of Korea |
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Abstract: | This study is concerned with a hot gas (refrigerant) bypass method to retard the formation and propagation of frost in an air-source heat pump. The feasibility of the hot gas bypass method was investigated experimentally and the method's performance is compared with that of a normal, 1.12 kW capacity air-source heat pump system with no defrost equipment such as an electric resistance heater. Results indicate that the hot gas bypass method is useful for retarding the formation and growth of frost at the outdoor coil. The best performance is shown under a bypass refrigerant flow rate of 0.2 kg/min (20% of the whole system refrigerant flow rate). During 210 min of heat pump operation, the hot gas bypass method improved COP and heating capacity at an average of 8.5% and 5.7%, respectively, relative to the normal system. |
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Keywords: | Heat pump Air-source Experiment Reduction Frost Hot gasMots clé s: Pompe à chaleur Air-air Expé rimentation Ré duction Givrage Gaz chaud |
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