Due to the concern on global warming, refrigerants having high GWP(Global Warming Potential) are being replaced to low GWP refrigerants. As for small slush maker, R-134a is being to replaced to R-290, whose GWP is 3. In this study, performance tests were conducted on the slush maker having dual evaporator, which was designed to operate using R-290. Results showed that the optimum refrigerant charge amount was 100g. At the charge amount, 61 minutes was needed to make a slush from a raw milk substance, which contained 10% sucrose. The power consumption was 0.89 kW, which yielded COP of 0.252. Tests were further conducted changing the outdoor air temperature. It was resulted that slush-making was possible at all outdoor temperatures except at an extreme temperature of 43°C. Even at the temperature, slush-making was possible if the machine operated with a single evaporator. The COP increased with the decrease of the outdoor temperature.

ABSTRACT
 1. 서 론
 2. 실험장치 및 방법
 3. 결과 및 고찰
  3.1 최적 냉매량 도출
  3.2 외기 온도 조건에 따른 성능 변화
 4. 결 론
 References

• 김내현(Incheon National University) | Nae-Hyun Kim Corresponding Author