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Low GWP refrigerants for air-conditioning and chiller applications.

Number: pap. 2649

Author(s) : SETHI A., YANA-MOTTA S. F.

Summary

Because of increasing concerns about climate change, various environmental regulations are being proposed to phase out high GWP refrigerants such as R410A and R134a. R410A refrigerant is used widely for residential and commercial air-conditioning, heat pump applications and air-cooled direct expansion chillers. This paper presents an evaluation of two low GWP refrigerants R447B (GWP=714) and R452B (GWP=675) as replacements for R410A. System simulations were carried out for a three Ton residential reversible heat pump at outdoor temperatures varying from 27.7°C to 46.1°C in cooling mode and 8.3°C in heating mode. R447B shows capacity within 5% of R410A and R452B shows a close match in capacity with R410A. For these simulations, both R447B and R452B show efficiency similar to R410A at ambient conditions below 35°C and show 3% to 4% higher efficiency at elevated temperatures. System simulations were also performed for a direct expansion R410A chiller at ambient temperature of 35°C. The simulations suggest that both R447B and R452B can show performance similar to R410A under the conditions and equipment simulated. This article also reports theoretical evaluations of replacements for R134a for medium pressure centrifugal chiller application. These evaluations suggest there may be low GWP refrigerant replacements available for chillers which can reduce the overall environmental emissions.

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Pages: 8

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Details

  • Original title: Low GWP refrigerants for air-conditioning and chiller applications.
  • Record ID : 30018971
  • Languages: English
  • Source: 2016 Purdue Conferences. 16th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2016/07/11

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