scholarly journals Performance analysis of a R744 and R404A cascade refrigeration system with internal heat exchanger

2012 ◽  
Vol 16 (1) ◽  
pp. 38-43 ◽  
Author(s):  
H.K. Oh ◽  
C.H. Son
Keyword(s):  
Heat Exchanger ◽  
Performance Analysis ◽  
Internal Heat ◽  
Refrigeration System ◽  
Internal Heat Exchanger ◽  
Cascade Refrigeration System ◽  
Cascade Refrigeration

scholarly journals Performance Analysis of Two-stage Compression Refrigeration System with Internal Heat Exchanger Applied Various Refrigerants

2015 ◽  
Vol 19 (6) ◽  
pp. 82-88
Author(s):  
Jung-In Yoon ◽  
Seong-Kwan Heo ◽  
Jae-Myun Je ◽  
Min-Ju Jeon ◽  
Chang-Hyo Son ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Performance Analysis ◽  
Internal Heat ◽  
Refrigeration System ◽  
Two Stage ◽  
Internal Heat Exchanger

scholarly journals Experimental Analysis of the R744/R404A Cascade Refrigeration System with Internal Heat Exchanger. Part 1: Coefficient of Performance Characteristics

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 6003
Author(s):  
Min-Ju Jeon
Keyword(s):  
High Temperature ◽  
Experimental Studies ◽  
Internal Heat ◽  
Coefficient Of Performance ◽  
Temperature Cycle ◽  
Refrigeration System ◽  
Evaporation Temperature ◽  
Internal Heat Exchanger ◽  
Cascade Refrigeration System ◽  
Cascade Refrigeration

This study evaluates the performance of an R744/R404A cascade refrigeration system (CRS) with internal heat exchangers (IHE) in supermarkets. R744 is used as the refrigerant in a low-temperature cycle, and R404A is used as the refrigerant in a high-temperature cycle. In previous studies, there are many studies including theoretical performance analysis of the CRS. However, experimental studies on the CRS are lacking, and experimental research on the R744/R404A system with an IHE is scarce. Therefore, this study provides basic data for optimal refrigeration system design by experimentally evaluating the results of modifying various parameters. The operating parameters considered in this study include subcooling and superheating, condensing and evaporating temperature, cascade evaporation temperature, and IHE efficiency in the R744 low- and R404A high-temperature cycle. The main results are summarized as follows: (1) By applying the results of this study, energy efficiency is achieved by optimizing the overall coefficient of performance (COP) of the CRS, and the refrigerant charge of the R404A cycle is minimized and economic efficiency is also obtained, enabling operation and maintenance as an environment-friendly system. (2) When designing the CRS, finding the cascade evaporation temperature that has the optimum and maximum COP according to the refrigerant combination should be considered with the highest priority.

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