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Experimental Study of An Indirect-Refrigeration System with Carbon Dioxide
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 Title & Authors
Experimental Study of An Indirect-Refrigeration System with Carbon Dioxide
Kim, Yoonsup; Baik, Wonkeun; Yun, Rin;
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Experimental studies for an indirect R404A- refrigeration system and a direct R404A refrigeration system were conducted. The configurations of the indirect R404A- refrigeration system are a R404A refrigeration system as a top cycle and a circulating system as a bottom cycle. The direct R404A system was modified from indirect R404A- refrigeration system by removing circuit for circulation. Various tests for both systems were conducted by changing load side brine temperature from 0 to 5 and with cooling brine temperatures for R404A system at 15, 20, or . The indirect R404A- refrigeration system showed the highest COP when load side brine temperature was at in the evaporator and at cooling brine temperature of . The COP of 3.04 under that condition was the highest. This indirect R404A- 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.
Carbon dioxide;R404A;Refrigeration;Indirect system;Cascade;
 Cited by
Likitthammanit, M., 2007, Experimental investigation of $NH_3/CO_2$ cascade and transcritical $CO_{2}$ refrigeration systems in supermarkets, Master of Sience Thesis, Stockholm, Sweden.

Alessandro da Silva, Enio Pedone Bandarra Filho, 2011, Comparison of a R744 cascade refrigeration system with R404A and R22 conventional systems for supermarkets, Applied Thermal Engineering, Vol. 41, pp. 30-35.

Yukinobu IKEMOTO, 2009, Outline and performance evaluation of R410A/$CO_{2}$ cascade heat pump systems, Magazine of the SAREK, Vol. 39 No. 11, pp. 40-49.

Yoonsup Kim, Rin Yun, 2015, Performance of Carbon Dioxide System for Freezing and Refrigeration, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 27, pp. 81-86. crossref(new window)