장영수 이민규 안영산 김영일 2024-01-21T05:35:48Z 2024-01-21T05:35:48Z 2021-09-06 2005-02 1229-6422 https://pubs.kist.re.kr/handle/201004/136779 The purpose of this study is to investigate the performance of outdoor heat exchanger for heat pump using carbon dioxide. Two types of fin and tube heat exchangers (2 rows for type A and 3 rows for B) are tested. Both heat exchangers have counter-cross flow and 1-circuit arrangement. Test results such as heat transfer rate, pressure drop characteristics and temperature distribution in the heat exchanger are shown with respect to mass flow rate of refrigerant and frontal air velocity. For cooling mode, the minimum temperature difference between air and refrigerant of type B is smaller than that of type A by 1 , but the pressure loss of air side is much higher for type B by 29%. It is found that a large temperature gradient of carbon dioxide during gas cooling process promotes thermal conduction through tube wall and fins which results in degradation of heat transfer performance. For heating mode operation, type B heat exchanger shows higher heat transfer performance compared to type A. However, because pressure loss of refrigerant side of type B is much greater than that of type A, the refrigerant outlet pressure of type B becomes lower than that of type A. 대한설비공학회 CO2 이용 열펌프의 실외열교환기 성능에 관한 실험적 연구 An Experimental Study on the Performance of Outdoor Heat Exchanger for Heat Pump Using CO2 Article 2 설비공학 논문집, v.17, no.2, pp.101 - 109 설비공학 논문집 17 2 101 109 kci ART001101827 Heat pump Carbon dioxide Outdoor heat exchanger Gas cooling Evaporation 열펌프 이산화탄소 실외열교환기 증발