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Comparative evaluation of the intermediate systems employed in two-stage refrigeration cycles driven by compound compressors

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  • Cabello, R.
  • Torrella, E.
  • Llopis, R.
  • Sánchez, D.

Abstract

This work presents an experimental evaluation, from an energy analysis point of view, for two of the most used inter-stage systems in two-stage vapour compression cycles driven by compound compressors: the direct liquid injection and subcooler systems. The evaluation, considers the two-stage cycle with no intermediate systems as reference cycle and was performed on a plant, driven by a compound compressor using the refrigerant R404A for an evaporating temperature range of −36 to −20 °C and for a condensing temperature range of 30–47 °C. The analysis of the results shows that the inter-stage systems determine the performance of the energy parameters, which are discussed in the paper. The configuration yielding the best results was the two-stage compression cycle with subcooler, since the cooling capacity and COP values for this configuration were the highest. Conversely, the two-stage compression cycle working with direct liquid injection showed lower performance from an energy point of view, though this configuration allows a substantial reduction of the discharge temperature.

Suggested Citation

  • Cabello, R. & Torrella, E. & Llopis, R. & Sánchez, D., 2010. "Comparative evaluation of the intermediate systems employed in two-stage refrigeration cycles driven by compound compressors," Energy, Elsevier, vol. 35(3), pages 1274-1280.
    • Handle: RePEc:eee:energy:v:35:y:2010:i:3:p:1274-1280
    DOI: 10.1016/j.energy.2009.11.009
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    Cited by:

    1. Sun, Zhili & Wang, Qifan & Xie, Zhiyuan & Liu, Shengchun & Su, Dandan & Cui, Qi, 2019. "Energy and exergy analysis of low GWP refrigerants in cascade refrigeration system," Energy, Elsevier, vol. 170(C), pages 1170-1180.
    2. Qureshi, Bilal Ahmed & Zubair, Syed M., 2012. "The impact of fouling on performance of a vapor compression refrigeration system with integrated mechanical sub-cooling system," Applied Energy, Elsevier, vol. 92(C), pages 750-762.
    3. Wen, Qiangyu & Zhi, Ruiping & Wu, Yuting & Lei, Biao & Liu, Shanwei & Shen, Lili, 2020. "Performance optimization of a heat pump integrated with a single-screw refrigeration compressor with liquid refrigerant injection," Energy, Elsevier, vol. 207(C).
    4. Yang, Mina & Jung, Chung Woo & Kang, Yong Tae, 2015. "Development of high efficiency cycles for domestic refrigerator-freezer application," Energy, Elsevier, vol. 93(P2), pages 2258-2266.

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