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Experimental investigation of operating point dependent optimal vapor injection in compressors with flammable refrigerants.

Number: 0433

Author(s) : KLEBIG T., FRIKEL M., VERING C., MÜLLER D.

Summary

To efficiently pursue the German climate targets, substituting fossil energy sources with renewable ones is necessary. The heat pump is a key technology for increasing the share of renewable energy sources in nearly every sector. In buildings, the heat supply at temperature levels up to 80 °C is a critical requirement to meet insulation standards and heating loads. High supply temperatures and high heating loads require efficient compression processes. Since the compressor efficiency depends on the operating point and the refrigerant, and decreases with increasing temperature lift, it is essential to investigate potential refrigerants in highly efficient compression processes such as vapor injection compression. While no universal modeling approach covers all relevant loss mechanisms based on the operating point, refrigerant, and injection rate, experiments are necessary to soundly determine the compressor's efficiency. We investigate the compressors envelope regarding temperature- and pressure-dependent refrigerant states of the injection process and their effect on compression efficiency using a fully automated compressor test bench. The two refrigerants R410A and R290 are analyzed employing first and second law analysis, and full factorial experimental design. Based on the measurements, fluid-dependent maps for the optimal injection states into are developed. The findings are integrated into Gaussian process models that can be used to improve the operation of heat pumps using natural refrigerants to efficiently reach higher temperature ranges.

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Pages: 12

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Details

  • Original title: Experimental investigation of operating point dependent optimal vapor injection in compressors with flammable refrigerants.
  • Record ID : 30031414
  • Languages: English
  • Subject: Technology
  • Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
  • Publication date: 2023/08/21
  • DOI: http://dx.doi.org/10.18462/iir.icr.2023.0433

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