| Title |
Performance Analysis of R404A Refrigeration System with Internal Heat Exchanger Using R744 as a Secondary Refrigerant |
| Authors |
오후규(Hoo-Kyu Oh) ; 손창효(Chang-Hyo Son) ; 이문빈(Wen-Bin Yi) ; 전민주(Min-Ju Jeon) |
| DOI |
http://dx.doi.org/10.6110/KJACR.2013.25.10.548 |
| Keywords |
2차 냉동시스템 ; 내부열교환기 ; 성능계수성능 분석 Secondary refrigeration system ; Internal heat exchanger ; COP ; Performance analysis |
| Abstract |
A thermodynamic analysis of the R404A refrigeration system with an internal heat exchanger using R744 as a secondary refrigerant is presented in this paper to optimize the design for operating parameters of the system. The main results are summarized as follows: The COP increases with increasing subcooling and superheating degree of R404A, internal heat exchanger and compression efficiency of the R404A cycle and evaporating temperature of the R744 cycle and decreasing temperature difference of the cascade heat exchanger and condensing temperature of the R404A cycle. The mass flow ratio decreases with increasing evaporating temperature of the R744 cycle and internal heat exchanger efficiency of the R404A cycle and decreasing subcooling and superheating degree of the R744 cycle, temperature difference of the cascade heat exchanger and condensing temperature of the R404A cycle. |