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Experimental investigation into the effect of charge optimization and standard test conditions on the seasonal performance in an R410A heat pump with dedicated subcooler.

Number: 0506

Author(s) : INAMPUDI S., ELBEL S.

Summary

There is an increased focus on the amount of refrigerant charge used in the HVAC&R systems due to the new restrictions and ongoing phase down of high GWP refrigerants as part of the F-gas regulation. In the current study, seasonal performance for a variable speed compressor in an R410A water ethylene glycol (WEG) heat pump system having a nominal heating capacity of 9 kW is estimated according to EU 14825. This study experimentally studied the effect of charge and the fixed/variable outlet condition on the seasonal performance of the water heat pump equipped with a variable speed compressor. The results of a charge optimization done at part load conditions show an unexpected peak in 𝐢𝑂𝑃𝑑𝑒𝑐 and results indicates that optimum charge has a higher impact on the efficiency at part load conditions than the nominal conditions. Based on the experimental results, the difference in the order of 5% in 𝑆𝐢𝑂𝑃 is found when comparing optimum charge and non-optimum charge in a variable speed compressor. 𝑆𝐢𝑂𝑃 can change by almost 22% depending on whether fixed/variable condenser temperature outlet operation is used.

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Pages: 12

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  • Original title: Experimental investigation into the effect of charge optimization and standard test conditions on the seasonal performance in an R410A heat pump with dedicated subcooler.
  • Record ID : 30033256
  • Languages: English
  • Source: 14th IEA Heat Pump Conference 2023, Chicago, Illinois.
  • Publication date: 2023/05

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