논문 국내 국내전문학술지(KCI급) 용량 가변 및 유량변화에 따른 지열원 물대물 열펌프 유닛의 충전량 변화에 따른 성능 특성
- 학술지 구분 국내전문학술지(KCI급)
- 게재년월 2011-12
- 저자명 최종민
- 학술지명 신재생에너지
- 발행처명 한국신·재생에너지학회
- 발행국가 국내
- 논문언어 외국어
- 전체저자수 2
홈페이지논문 초록 (Abstract)
The objective of this study is to investigate the effects of the refrigerant charge amount on the performance of a water-to-water ground source heat pump with a variation of compr essor speed and the secondary fluid flow rate. The water-to-water ground source heat pump was tested by varying refrigeran t charge amount from -40% to 20% of full charge. Compressor speed was changed from 30 Hz to 75 Hz and the secondary flui d flow rate was adjusted from 6 LPM to 14 LPM. For all test conditions, EWTs of an indoor heat exchanger and an outdo or heat exchanger were maintained at standard conditions of ISO 13256-2. The slope of the COP with the variation of charge amou nt is much steeper at undercharged conditions than that at overcharged conditions. For all compressor speed, the variatio n of the system performance according to charge amounts showed the similar trends. However, the optimum charge amount of the sy stem increased a little with an increment of compressor speed. When the secondary fluid flow rate decreased, the system was o ptimized at higher refrigerant charge amount conditions.