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A Method for determining practical flammability risk when using refrigerant blends

Abstract : This paper proposes a method for establishing improved guidelines regarding the use of refrigerant blends that contain a flammable component. This approach was verified in a test chamber under realistic refrigerating equipment leak scenarios. First, the paper provides an overview of the safety classification described in ANSI/ASHRAE Standard 34-2007, Designation and Safety Classification of Refrigerants (ASHRAE 2007) and its international equivalent ISO Standard 817-2006, Refrigerants--Designation and Safety Classification (ISO 2006). The refrigerant blends examined were A1, as formulated, and A2, at the "worst-case fractionated formulation," as defined by ASHRAE Standard 34-2007. The blend is prepared in a cylinder and is then slowly leaked inside a test chamber of 1 m3 (35.31 ft3). At the beginning of the leak, the gas phase occupies 10% of the cylinder volume, corresponding to one of the leak scenarios featured in ISO Standard 817-2006. The concentrations inside the test chamber are measured by gas chromatography. In addition, this paper provides the algorithm of calculation of a computer code named Room_leak, which simulates leaks of any refrigerant blends in realistic scenarios. © 2009, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.
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Submitted on : Wednesday, December 23, 2009 - 2:49:16 PM
Last modification on : Wednesday, November 17, 2021 - 12:30:10 PM


  • HAL Id : hal-00442896, version 1


Denis Clodic, Youssef Riachi. A Method for determining practical flammability risk when using refrigerant blends. HVAC & R Research, 2009, 15 (5), pp.819-834. ⟨hal-00442896⟩



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