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김윤섭(Yoonsup Kim),백원근(Wonkeun Baik),윤린(Rin Yun) 대한설비공학회 2016 설비공학 논문집 Vol.28 No.5
Experimental studies for an indirect R404A-CO₂ refrigeration system and a direct R404A refrigeration system were conducted. The configurations of the indirect R404A-CO₂ refrigeration system are a R404A refrigeration system as a top cycle and a circulating CO₂ system as a bottom cycle. The direct R404A system was modified from indirect R404A-CO₂ refrigeration system by removing circuit for CO₂ circulation. Various tests for both systems were conducted by changing load side brine temperature from 0 to 5 and 10℃ with cooling brine temperatures for R404A system at 15, 20, or 25℃. The indirect R404A-CO₂ refrigeration system showed the highest COP when load side brine temperature was at 10℃ in the evaporator and at cooling brine temperature of 15℃. The COP of 3.04 under that condition was the highest. This indirect R404A-CO₂ refrigeration system showed 9.02% higher COP than the direct R404A system that had increased pipeline length of 15 m, which simulated actual installation in a supermarket.