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운전조건 변화가 CO₂ 자동차 에어컨 시스템의 냉방성능에 미치는 영향에 대한 실험적 연구
이준경(Jun Kyoung Lee),이동혁(Dong Hyuk Lee),이헌균(Heon Kyun Lee),원종필(Jong Phil Won),최규정(Kyu Jung Choi),주필호(Phil Ho Ju),이원석(Won Suk Lee),최동기(Dong Ki Choi) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper deals with the research for the effects of the operating parameters that could be used for a transcritical CO₂ mobile air-conditioning system on the cooling performance. It presents experimental results for the performance characteristics of a CO₂ mobile air conditioning system with various operating conditions such as different gas cooler inlet pressures and frontal air velocities/temperatures passing through the evaporator and the gas cooler. Experimental results show that the cooling capacity was more than 5㎾ and coefficient of performance (COP) was more than 2.1, also. Therefore, we checked that the mobile air-conditioning system using CO₂ has good cooling performance compared to that using HFC-134a.
CO₂ 자동차 에어컨 시스템의 최적 고압 설정 알고리즘 개발에 관한 연구
이준경(Jun Kyoung Lee),이동혁(Dong Hyuk Lee),이헌균(Heon Kyun Lee),원종필(Jong Phil Won),최규정(Kyu Jung Choi),주필호(Phil Ho Ju),이원석(Won Suk Lee),최동기(Dong Ki Choi) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper deals with the development of optimum high pressure control algorithm for a transcritical CO₂ mobile air-conditioning system to achieve the maximum COP. The experiments were performed under idle and driving operating conditions. The experimental results demonstrated that the COP of the transcritical CO₂ system is a strong function of the gas cooling pressure. In other words, the COP was increased and then decreased with increase of the high pressure. Therefore the value of high pressure which has maximum COP could be selected. Furthermore, the strong(linear) relation between the optimum high pressure and the gas cooler outlet temperature was revealed, which suggests a simple controller of only one parameter for the transcritical CO₂ cycle.