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Influence of refrigerant and compressor construction forms on efficiencies assessed by dynamic simulation models.

Number: 0388

Author(s) : VERING C., SCHWENZER C., GOBEL S., VENZIK V., NURENBERG M., MULLER D.

Summary

The compressor’s performance is crucial for an efficient heat pump operation. In order to compare different refrigerants thermodynamically, efficiencies are often assumed constant and the influence of the construction form is neglected. The resulting steady-state comparisons allow first system insights without conducting expensive experiments. In dynamic operation, however, efficiencies vary due to compressor’s rotational speed and its pressure ratio. This leads to different insights compared to previous steady-state results.
We present an open-source one-dimensional physical compressor model for a rolling piston-type and a reciprocating piston-type compressor in Modelica. It calculates both isentropic and volumetric efficiency depending on the refrigerant, construction form and operating point. Analysing all results, we prove our modelling approach to be valid. In conclusion, we apply the model to better understand the compression process in heat pump applications. Furthermore, regarding the design, different mechanical adjustments can be tested in the simulation model to estimate their performance impact.

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Pages: 8

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Details

  • Original title: Influence of refrigerant and compressor construction forms on efficiencies assessed by dynamic simulation models.
  • Record ID : 30028219
  • Languages: English
  • Subject: Technology
  • Source: 10th IIR Conference on Compressors and Refrigerants.
  • Publication date: 2021/01/13
  • DOI: http://dx.doi.org/10.18462/iir.compr.2021.0388
  • Document available for consultation in the library of the IIR headquarters only.

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