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Theoretical analysis of transcritical HTHP cycles with low gwp hfo refrigerants and hydrocarbons for process heat up to 200 °C.

Number: 1168

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

Summary

Transcritical heat pump cycles are suitable for processes that require large temperature glides on the heat sink, such as air or hot water heating. Refrigeration systems or hot water heat pumps often apply transcritical CO2 cycles. For industrial waste heat recovery with high temperature heat sources, transcritical CO2 heat pumps are not suitable. This study investigates the feasibility of low GWP HFO refrigerants and hydrocarbons for the delivery of process heat up to 200 °C using transcritical HTHP cycles. Steady-state models with IHX and parallel compression have been developed to analyse the cycle performance for heating air from 30 to 200 °C and water from 100 to 200 °C. The design aspects of the main cycle components are discussed, especially compressor and refrigerant-oil selection. The analysis shows that the gas cooler pressure is the most important optimization parameter to achieve highest efficiency up to 3.5. The transcritical cycle with IHX is easy to control and is technically feasible with one or two compression stages. R1233zd(E), R1224yd(Z) and R600 are considered the best refrigerant candidates.

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Pages: 9

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Details

  • Original title: Theoretical analysis of transcritical HTHP cycles with low gwp hfo refrigerants and hydrocarbons for process heat up to 200 °C.
  • Record ID : 30027688
  • Languages: English
  • Subject: HFCs alternatives
  • Source: IIR Rankine Conference 2020.
  • Publication date: 2020/07/31
  • DOI: http://dx.doi.org/10.18462/iir.rankine.2020.1168

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