| Title |
An Experimental Study on Oil Effect of CO2 in Heat Pump Outdoor Heat Exchanger |
| Authors |
이진관(Jin Gwan Lee) ; 장영수(Young Soo Chang) ; 김서영(Seo Young Kim) ; 김용찬(Yongchan Kim) |
| Keywords |
이산화탄소 ; 가스냉각기 ; 오일 영향 ; 열전달률 ; 압력강하 Carbon dioxide ; Gas cooler ; Oil effect ; Heat transfer rate ; Pressure drop |
| Abstract |
In order to investigate the effects of PAG oil concentration on heat transfer performance and pressure drop during gas cooling process of CO2, the experiments on fin-tube heat exchanger of CO2 heat pump were performed. The experimental apparatus consists of a gas cooler, a heater, a chiller, a mass flow meter, a pump and measurement system. Experiments were conducted in various experimental conditions, which were inlet temperature(110℃), mass flow rates(50, 55, 60, 65, 70 g/s) and PAG oil concentration(0 to 2.6 wt%). Heat transfer rate decreased with the increase of the oil concentration and the decrease of inlet pressure. And pressure drop increased with the increase of the oil concentration and mass flow rate of refrigerant. The COP reduction by deterioration of gas cooler performance with oil concentration was analyzed. When inlet pressure of gas cooler is 100 bar, the COP reduction was estimated by 6% under 1 wt% of oil concentration. |