차량용 CO₂ 에어컨 사이클 성능 향상을 위한 일체형 팽창기-압축기 성능 해석

• Published in: 설비공학 논문집, 30(3) Vol. 30; no. 3; pp. 107 - 115
• Main Authors: 최재웅(Jae Woong Choi), 임정택(Jeong Taek Lim), 김현진(Hyun Jin Kim)
• Format: Journal Article
• Language: Korean
• Published: 대한설비공학회 01.03.2018
• Subjects: 기계공학; Vane rotary compressor(베인 로터리 압축기); Compressor input(압축기 입력); CO₂ air conditioning cycle(CO₂ 에어컨 사이클); Vane rotary expander(베인 로터리 팽창기); COP(성적계수)
• ISSN: 1229-6422; 2465-7611
• DOI: 10.6110/KJACR.2018.30.3.107

A design combining the use of a compressor and expander was introduced in order to improve the cycle performance of a CO2 automotive air conditioning system. Both the compressor and expander used were of rotary vane type and were designed to share a common shaft in a housing. Numerical simulation was carried out to evaluate the merit of the combined unit. In a typical automotive air conditioning operating conditions, the COP of the system was improved by 8.7% by the application of the combined unit. The compressor input was reduced by 5.2% through use of the expander output. In addition, about 3.06% increase in the cooling capacity was obtained through isentropic expansion in the expander. Our study noted that, as the pressure difference between the gas cooler and the evaporator becomes larger, the COP of the system improved increases unless the mass flow rate in the expander exceeds that in the compressor. KCI Citation Count: 2