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Investigation of indirect measuring methods for evaluating the energy efficiency of a low temperature refrigerating system under different operating conditions.

Number: 1247

Author(s) : HUDJETZ S., PFEIFFER D., BECKER M.

Summary

Specification VDMA 24247-7:2021 suggests different indirect measuring methods for evaluating the energy efficiency of refrigerating systems. These indirect measuring methods were compared to directly measured reference values using monitoring data of a real-world refrigerating system. Recommendations for improving two of these methods were given. However, only a limited range of operating conditions was investigated initially – i.e., low cooling capacity and refrigerant mass flow, respectively. Now, a wider range of operating conditions has been analyzed, including medium and high values of refrigerant mass flow as well as quasi-constant and intermittent operation. The analysis confirms previous results showing that indirect methods could be an alternative to a direct measurement. In five of six investigated scenarios, the median deviation between the indirect measuring method and direct reference measurement was less than 4 % for mass flow rate as well as cooling capacity and between -5 % and 11 % for the Total Coefficient of Performance.

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Pages: 12 p.

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Details

  • Original title: Investigation of indirect measuring methods for evaluating the energy efficiency of a low temperature refrigerating system under different operating conditions.
  • Record ID : 30032747
  • Languages: English
  • Source: 16th IIR-Gustav Lorentzen Conference on Natural Refrigerants (GL2024). Proceedings. University of Maryland, College Park, Maryland, USA, August 11-14 2024
  • Publication date: 2024/08
  • DOI: http://dx.doi.org/10.18462/iir.gl2024.1247

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