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Extension of a virtual refrigerant charge sensor.

Author(s) : KIM W., BRAUN J. E.

Type of article: Article, IJR article

Summary

The primary goal of the work described in this paper was to evaluate and extend a virtual refrigerant charge sensor (VRC) for determining refrigerant charge for equipment having variable-speed compressors and fans. Based on the evaluations, the original VRC sensor (termed model I) was found to work well in estimating the refrigerant charge level for systems with a variable-speed compressor. However, for extreme test conditions such as low compressor speed, the model I needed to be improved. To overcome the limitations, the model was modified to include a term involving the inlet quality to the evaporator (termed model II). The model II gave better performance for systems with a variable-speed compressor. When the superheat of the compressor was zero, neither model II could accurately predict charge level. Therefore, a third approach (Model III) was developed that includes the discharge superheat of the compressor.

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Format PDF

Pages: 224-235

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Details

  • Original title: Extension of a virtual refrigerant charge sensor.
  • Record ID : 30014801
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 55
  • Publication date: 2015/07

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