| Title |
Experimental Study of An Indirect-Refrigeration System with Carbon Dioxide |
| Authors |
Yoonsup Kim ; Wonkeun Baik ; Rin Yun |
| DOI |
http://dx.doi.org/10.6110/KJACR.2016.28.5.202 |
| Keywords |
이산화탄소 ; 냉장 ; 간접 시스템 ; 캐스케이드 Carbon dioxide ; R404A, Refrigeration ; Indirect system ; Cascade |
| Abstract |
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. |