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

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  • Min-Ju Jeon

    (Department of Refrigeration and Air-Conditioning Engineering, College of Engineering, Chonnam National University, 50, Daehak-ro, Yeosu 59626, Korea)

Abstract

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.

Suggested Citation

  • Min-Ju Jeon, 2021. "Experimental Analysis of the R744/R404A Cascade Refrigeration System with Internal Heat Exchanger. Part 1: Coefficient of Performance Characteristics," Energies, MDPI, vol. 14(18), pages 1-20, September.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:18:p:6003-:d:640178
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    References listed on IDEAS

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    1. Sun, Zhili & Liang, Youcai & Liu, Shengchun & Ji, Weichuan & Zang, Runqing & Liang, Rongzhen & Guo, Zhikai, 2016. "Comparative analysis of thermodynamic performance of a cascade refrigeration system for refrigerant couples R41/R404A and R23/R404A," Applied Energy, Elsevier, vol. 184(C), pages 19-25.
    2. Bai, Tao & Yu, Jianlin & Yan, Gang, 2016. "Advanced exergy analysis on a modified auto-cascade freezer cycle with an ejector," Energy, Elsevier, vol. 113(C), pages 385-398.
    3. Morosuk, T. & Tsatsaronis, G., 2009. "Advanced exergetic evaluation of refrigeration machines using different working fluids," Energy, Elsevier, vol. 34(12), pages 2248-2258.
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    1. Min-Ju Jeon, 2022. "Experimental Analysis of the R744/R404A Cascade Refrigeration System with Internal Heat Exchanger. Part 2: Exergy Characteristics," Energies, MDPI, vol. 15(3), pages 1-20, February.

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