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Experimental comparison of HCFO R1233zd(E) and R1224yd(Z) in a high temperature heat pump up to 150 °C.

Number: 1129

Author(s) : ARPAGAUS C., BERTSCH S. S.

Summary

Hydrofluoroolefins (HCFO) are part of the 4th generation of refrigerants with very low global warming potential (GWP), almost zero ozone depletion potential (ODP), non-flammability and high critical temperature for use in high temperature heat pumps (HTHP). This study investigates R1233zd(E) and R1224yd(Z) experimentally as drop-in replacements for today's R245fa in a laboratory HTHP with 10 kW heating capacity. COPs in the range of 4.5 to 2.1 were achieved at 30 to 80 °C heat source and 30 to 150 °C heat sink temperature (30 to 70 K temperature lift). The COPs with R1224yd(Z) were comparable with R1233zd(E) in the entire operation map. An internal heat exchanger increased the efficiency by up to 16%. The heating capacity of R1224yd(Z) was on average 8% higher than that of R1233zd(E) due to the lower boiling temperature. R1233zd(E) potentially achieves higher condensing temperatures due to the higher critical temperature. After about 100 operating hours in the HTHP, there was negligible oil or refrigerant degradation.

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Pages: 9

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Details

  • Original title: Experimental comparison of HCFO R1233zd(E) and R1224yd(Z) in a high temperature heat pump up to 150 °C.
  • Record ID : 30027655
  • Languages: English
  • Subject: HFCs alternatives
  • Source: IIR Rankine Conference 2020.
  • Publication date: 2020/07/31
  • DOI: http://dx.doi.org/10.18462/iir.rankine.2020.1129

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