HFC-134a is currently used as a refrigerant in automotive air conditioning system replacing the ozone depleting CFC-12 refrigerant. This paper was experimentally studied on the performance characteristics of an automotive air conditioning system with variations of charging refrigerant and compressor speed. An air conditioning system was composed of laminated type evaporator, parallel flow type condenser, vane rotary type compressor, externally equalized thermostatic expansion valve and receiver drier with specifications of Hyundai Sonata Ⅱ vehicle. And the automatic measuring system of air conditioner used KTE-1000BA developed by a KT ENG Co., Ltd.. of Korea. The optimum conditions which were tested as available parameters for better performance are indicated charging refrigerant 800 g and compressor speed 1700 rpm.

Abstract
 1. 서 론
 2. 실험장치 및 방법
  2.1 실험장치 및 장치구성
  2.2 실험방법
 3. 실험결과 및 고찰
  3.1 에어컨 시스템의 열역학적 특성
  3.2 냉매충전량에 따른 열교환량과 성능 변화
  3.3 Mollier 선도상의 비교
 4. 결 론
 참 고 문 헌

• 윤준규(경원대학교 기계⋅자동차공학과) | J. K. YOON
• 임종한(경원대학교 기계⋅자동차공학과) | J. H. LIM
• 김철수((주)케이티이엔지) | C. S. KIM