This experimental study was conducted to investigate the refrigeration cycle performance of a 10kW refrigerator unit using R404A refrigerant. The capacity, COP, and refrigeration cycle of the refrigerator unit were confirmed by changes in refrigerant charging amount and degree of superheat. The cooling capacity and COP of the refrigerator unit showed different tendency according to changes in refrigerant charging amount and degree of superheat. It was confirmed that the performance changes of the refrigerator unit were more dependent on the change in degree of superheat than the refrigerant charging amount. From the capacity, COP, pressure, and p-h diagram, the refrigeration cycle of the refrigerator unit showed the greatest capacity and COP at 4℃ for degree of superheat and 7,400g for the refrigerant charging amount.

ABSTRACT
 1. 서 론
 2. 실험장치 및 실험방법
 3. 실험 결과
  3.1 최적 냉매량 범위 선정
  3.2 과열도 변화에 따른 성능특성
  3.3 냉매 충전량에 따른 성능특성
 4. 결 론
 References

• 최연성(Department of Mechanical Engineering, Sunmoon University) | Youn-Sung Choi
• 권영철(Department of Mechanical Engineering, Sunmoon University) | Young-Chul Kwon Corresponding Author