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A2L refrigerants leak and ignition testing for a walk-in cooler system.

Number: pap. n. 448

Author(s) : WANG X.


Environmental concerns have triggered a series of activities globally to curtail the use of high GWP hydrofluorocarbons (HFCs). Many of these alternative refrigerants are mildly flammable (A2L safety classification per ASHRAE 34). To properly address A2L refrigerants in safety standards, the Air-Conditioning, Heating, and Refrigeration Technology Institute (AHRTI) undertook a research project to investigate A2L refrigerants, specifically to carry-out leak and ignition testing under whole room scale conditions. This paper summarizes the results of A2L refrigerants R-455A and R-457A leak and ignition tests for a walk-in cooler system. A 12x14x8ft walk-in system was built with a ceiling mounted unit cooler installed inside the walk-in box. The testing simulated refrigerant leaks from the evaporator with ignition sources present. The results showed that the leak location (coil face vs. return bend) influenced the ignition results. The maximum temperatures observed inside the walk-in box were in the range of 1500~1700F in ignition events.

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  • Original title: A2L refrigerants leak and ignition testing for a walk-in cooler system.
  • Record ID : 30026202
  • 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.2019.0448


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