운전조건 변화에 따른 이산화탄소 열펌프의 냉난방 성능특성 비교Cooling and Heating Performances of a CO₂ Heat Pump with the Variations of Operating Conditions
- Other Titles
- Cooling and Heating Performances of a CO₂ Heat Pump with the Variations of Operating Conditions
- Authors
- 김용찬; 조홍현; 백창현; 이응찬; 강훈
- Issue Date
- 2008
- Publisher
- 대한기계학회
- Keywords
- Carbon Dioxide(이산화탄소); Transcritical Cycle(초월임계 사이클); Coefficient of Performance(COP; 성능계수); Electronic Expansion Valve(EEV; 전자팽창밸브)
- Citation
- 대한기계학회논문집 B, v.32, no.6, pp.454 - 462
- Indexed
- SCOPUS
KCI
- Journal Title
- 대한기계학회논문집 B
- Volume
- 32
- Number
- 6
- Start Page
- 454
- End Page
- 462
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/124662
- ISSN
- 1226-4881
- Abstract
- Since operating conditions are significantly different for heating and cooling mode operations in a CO₂ heat pump system, it is difficult to optimize the performance of the CO₂ cycle. In addition, the performance of a CO₂ heat pump is very sensitive to outdoor temperature and gascooler pressure. In this study, the cooling and heating performances of a variable speed CO₂ heat pump with a twin-rotary compressor were measured and analyzed with the variations of EEV opening and compressor frequency. As a result, the cooling and heating COPs were 2.3 and 3.0, respectively, when the EEV opening was 22%. When the optimal EEV openings for heating and cooling were 28% and 16%, the cooling and heating COPs increased by 3.3% and 3.9%, respectively, over the COPs at the EEV opening of 22%. Beside, the heating performance was more sensitive to EEV opening than the cooling performance. As the compressor speed decreased by 5 Hz, the cooling COP increased by 2%, while the heating COP decreased by 8%.
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Collections - College of Engineering > Department of Mechanical Engineering > 1. Journal Articles
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