# 저온측과 고온측 냉매간 열교환이 열펌프의 성능특성에 미치는 영향

• 이건중 (충북대학교 대학원 농업기계공학과) ;
• 송현갑 (충북대학교 대학원농업기계공학과)
• Published : 1999.12.01

#### Abstract

The ambient air is commonly used as low-temperature heat sources for heat pump operation. However, the coefficient of performance (COP) of the air -water heat pump is decreased with the ambient air temperature drop. In this study to solve this problem , the AVACTHE(Automatic Variable Area Capillary Type Heat Exchanger) with 3 levels of heat exchange area(0, 1495.4, 1794.5$\textrm{cm}^2$) was installed in the refrigerant circuit of the heat pump. The AVACTHE effect on the performance of heat pump was tested with the ambient air temperature variation. The high level COP of the heat pump could be achieved by the AVACTHE installation when below -5$^{\circ}C$ of the ambient air temperature.