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IIR document

Reduced-order model to estimate safe flammable refrigerant charge limits for a one-room air conditioner.

Number: pap. n. 1150

Author(s) : EDWARDS K. D., ABU-HEIBA A., STOYANOV M., et al.

Summary

The Heating, Ventilation, Air-Conditioning and Refrigeration (HVAC&R) industry is currently transitioning away from high global warming potential (GWP) hydrofluorocarbon (HFC) refrigerants. However, many lower-GWP alternatives are flammable. Current safety codes restrict use of all flammable refrigerants; revision of the codes is needed to facilitate wider use of flammable alternatives. Hence, information is needed to enable reliable estimates of safe charge limits for flammable refrigerant options for different HVAC&R applications. A reduced-order model (ROM) was developed and validated to help estimate safe charge limits based on computational fluid dynamics (CFD) simulations of refrigerant releases in a single room for a range of parameters. Validation of the ROM vs. the CFD results showed good general agreement for mean refrigerant concentration. The normalized mean bias error (NMBE) was 0.67% with a maximum error of 15%.

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Pages: 9

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Details

  • Original title: Reduced-order model to estimate safe flammable refrigerant charge limits for a one-room air conditioner.
  • Record ID : 30026075
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.1150

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