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Alternate refrigerants for heat pump water heater applications - Opportunities and challenges.

Number: 2692

Author(s) : NAWAZ K., SHEN B., ELATAR A., BAXTER V., ABDELAZIZ O.

Summary

Growing awareness of the potential environmental impacts of conventional refrigerants (CFCs and HFCs) has led to efforts to identify suitable alternative refrigerants for various heat pump applications with minimum environmental impact. This study is focused on the performance evaluation of various alternatives including hydrocarbon (HC), hydroflouroolefins (HFO), and CO2 as drop-in-replacement for R134a for heat pump water heating (HPWH). Fundamental thermophysical properties have been used to highlight the important performance characteristics of the systems when such fluids are deployed working medium. Key performance parameters such as unified energy factor, first hour rating and thermal stratification in the water tank are investigated using simulation and experimental approaches. The findings suggest that both alternative refrigerants could provide comparable system performance to that of the baseline system containing R134a. System refrigerant charge and the condenser discharge temperature are established to investigate the potential of hydrocarbon refrigerants to substitute R134a without significant system modifications. The overall objective is to identify the major challenges and opportunities for alternative refrigerants for heat pump water heater in terms of performance, required infrastructure and potential for drop-in-replacement. Notice: This manuscript has been authored in part by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).

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Pages: 10

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Details

  • Original title: Alternate refrigerants for heat pump water heater applications - Opportunities and challenges.
  • Record ID : 30028582
  • Languages: English
  • Subject: HFCs alternatives
  • Source: 2021 Purdue Conferences. 18th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2021/05
  • Document available for consultation in the library of the IIR headquarters only.

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