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Approaching the performance limit for economized cycles using simplified cycles.

Author(s) : MATHISON M. M., BRAUN J. E., GROLL E. A.

Type of article: Article, IJR article

Summary

Modifications such as economization aim to improve the efficiency of vapor compression equipment by cooling the refrigerant during the compression process. A previous study (Mathison et al., 2010) explored the theoretical limit to cycle performance with economizing, which was defined as the performance when a saturated vapor state was maintained in the compressor by continuously injecting a two-phase mixture. However, achieving continuous injection and controlling the quality of the injected refrigerant poses a substantial challenge. Therefore, the current paper investigates the ability of an economized cycle with saturated vapor injection through a finite number of ports to approach the limiting cycle performance. For an air-conditioner using R-410A with an evaporation temperature of 5°C and a condensing temperature of 40°C, the model predicts that injecting saturated vapor through three ports will improve the COP by 12%, which is approximately 67% of the maximum benefit provided by economizing in the limiting case.

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Pages: 64-72

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Details

  • Original title: Approaching the performance limit for economized cycles using simplified cycles.
  • Record ID : 30011934
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 45
  • Publication date: 2014/09

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