논문 해외 국제전문학술지(SCI급) CAPACITY MODULATION OF A CASCADE HEAT PUMP WITH THE VARIATION OF COMPRESSOR SPEED AND ELECTRONIC EXPANSION VALVE OPENING
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2014-09
- 저자명 최종민
- 학술지명 JOURNAL OF RENEWABLE AND SUSTAINABLE ENERGY
- 발행처명 AMER INST PHYSICS
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 2
홈페이지논문 초록 (Abstract)
With the increased awareness on excessive energy consumption, increasing fuel cost and negative environmental impact (ozone depletion and global warming) of the major heat generation systems and processes, the ability of heat pumps to generate high temperature with very efficient use of energy and minimal environmental impact ha s gained lots of awareness over the years. Some domestic and most in dustrial heating and refrigeration applications demand very high tem perature lifts. Single-stage cycles do not practically support these applications since their performance and reliability decrea se greatly. High temperature generation can be successfully executed th rough the use of cascade heat pump. This study analyzes the effects o f compressor speed and electronic expansion valve (EEV) opening on the p erformance of the cascade heat pump in heatingmode. The rate of incre ase of capacity with high-stage (HS) EEV opening at higher HS comp ressor speed is larger than it at high low-stage (LS) compressor speed. The slope of the capacity with the HS EEV opening was much steeper at s mall opening range than that at large opening range. When the LS compre ssor speed increased, the maximum Coefficient of Performance (COP) oc curred at larger HS EEV opening than the standard opening. The COP v ariation at the range of low HS compressor speed had smaller dependenc y on the LS EEV opening than that at the range of high HS compressor s peed. (C) 2014 AIP Publishing LLC.