In this paper, cycle performance analysis of cascade refrigeration system using alternative FREON refrigerants are presented to offer the basic design data for the operating parameters of the system. The operating parameters considered in this study include subcooled and superheated degree, and evaporating and condensing temperature, temperature difference of cascade heat exchanger in cascade refrigeration system. The COP of cascade refrigeration system increases with the increasing subcooled degree, but there is no significant changes with the increasing superheated degree. The COP of cascade refrigeration system depends on evaporating and condensing temperatures of cascade heat exchanger. Therefore, subcooled degree, evaporating and condensing temperature of cascade heat exchanger using alternative FREON refrigerants have an effect on the COP of this system. In this paper, COP of cascade refrigeration system using R23 for low temperature system and R507A for high temperature system is higher 8 ~ 29 % than using R13 for low temperature system and R22 for high temperature system.

Abstract
 1. 서론
 2. 성능 분석
 3. 결과 및 고찰
  3.1 과냉각도의 영향
  3.2 과열도의 영향
  3.3 증발온도의 영향
  3.4 캐스케이드 열교환기의 영향
 4. 결론
 참고문헌

• 노건상(동명대학교 공과대학 냉동공조공학과) | Roh, Geonsang