Abstract The cascade refrigeration cycle system has been used mainly to obtain the ultra-low temperature. In this study, the effects of internal and outdoor temperatures at chamber on the heat capacity of fin-tube heat exchangers were examined. In addition, refrigerant line patterns as well as refrigerant type for cascade cycle were optimized. The results in this study show that the refrigerant line patterns have greater effect on the sensible capacity than the total capacity. Also, the condenser heat release rate for R717-R744 cycle varies the ratio of 46 % with outdoor temperature by comparing with that of 24% for R134a-R410a cycle.

1. 서 론
 2. 핀-코일 열교환기 설계
 3. 결과 및 고찰
  3.1 핀-튜브 증발기 냉매라인 패턴에 따른 흡열량 해석
  3.2 R134a 혹은 R717을 이용한 응축기 입구공기온도에 따른 방열량 해석
  3.3 R410a 혹은 R744를 이용한 증발기 입구공기온도에 따른 흡열량 해석
 4. 결 론
 후 기
 References

• 박상준(공주대학교 기계공학과 대학원) | Sang Jun Park
• 이영림(공주대학교 기계자동차공학부) | Young Lim Lee Corresponding Author