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기액분리기를 적용한 가스 인젝션 히트펌프의 성능 향상에 관한 실험적 연구
손길수(Kilsoo Son),김동우(Dongwoo Kim),최성경(Sungkyung Choi),김용찬(Yongchan Kim) 대한설비공학회 2017 설비공학 논문집 Vol.29 No.6
Air-source heat pumps are widely used in residential heating systems. However, the decrease in the capacity of the heat pump is unavoidable when operating at very low and high ambient temperatures. The vapor injection technique is considered a promising technology to overcome this problem. Recent research on vapor injection cycles have mainly adopted a scroll compressor with an internal heat exchanger at severe operating conditions. This study measured the COP and EER of a gas injection heat pump using a flash tank with an inverter-driven rotary compressor at severe operating conditions. Compared to non-injection heat pumps, the heating capacity and COP of the gas injection heat pump improved up to 15% and 2.9%, respectively, at outdoor temperatures of -10℃ to 7℃. The cooling capacity of the gas injection heat pump was 11% higher than the non-injection heat pump at an outdoor temperature of 35℃. At the same time, the EER of the gas injection heat pump was similar to that of the non-injection heat pump.
진동형 히트파이프를 이용한 이중진공관 태양열 집열기의 성능 평가
손길재(Gil-Jae Son),김종수(Jong-Soo Kim),하수정(Su-Jung Ha),정방호(Bang-Ho Jung) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
This study represents the thermal performance of the evacuated solar collector using the pulsating heat pipe. In this study, the important thing is collective efficiency of the evacuated solar collector. The evacuated solar collectors with the shape of the heat pipe were investigated in the same operating condition for a outdoor experiment equipment. The experimental conditions are as follows ; The charging ratio of working fluid was 110% of evaporation section volume. The inclination angle was 35˚from the ground. The mass flow rate is 1 ㎏/min. The working fluid is 142b.