논문 해외 국제전문학술지(SCI급) PERFORMANCE COMPARISON BETWEEN R22 AND R744 SOLAR-GEOTHERMAL HYBRID HEAT PUMPS ACCORDING TO HEAT SOURCE CONDITIONS
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2014-11
- 저자명 최종민
- 학술지명 RENEWABLE ENERGY
- 발행처명 PERGAMON-ELSEVIER SCIENCE LTD
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 3
홈페이지논문 초록 (Abstract)
Solar heat and geothermal energy are widely used renewable energy which is one of important issue for future. Besides, R744 as environmental friendly refrigerant has advantage to apply into heat pump system. I n this study, the performance the R22 and R744 solar-geothermal hybrid heat pumps was investigated numerically according to heat pump operating temperature, solar radiation, indoor design temperat ure and evaporator inlet temperature from ground. As a result, as the heat pump operatingtemperature increased from 40 degrees C to 48 degre es C, the coefficients of performance (COPs) of the R22 and R744 heat p ump systems decreased by 20.1% and 19.0%, respectively. Additiona lly, as the evaporator inlet temperature from ground increased from 1 1 degrees C to 19 degrees C, the COPs for the R22 and R744 heat pumps i ncreased by 17% and 29%, respectively. Underbasic operational conditi ons, the heat COP of the R22 heat pump showed a 28.8% higher value com pared to that of the R744 heat pump. The efficiency of solar collector in R744 solar-geothermal hybrid heat pump is 4.1% higher than that in R22 one. In addition, the heating capacity of the R22 heat pump was 10 % higher than that of the R744 heat pump. The solar collector system w as more effective in the R744 hybrid heat pump compared to the R22 hy brid heat pump. (C) 2014 Elsevier Ltd. All rights reserved.