Risk Assessment of Built-in Refrigerated Display Cabinet using A3 Refrigerants

Abstract

In Japan, since 2011, risk assessments of various appliances had been carried out to establish methods for ensuring the safe use of products using A2L refrigerants, followed by product launches in Japanese market. However, further shift to lower GWP refrigerants is desired in response to the Kigali Amendment. Most of the refrigerants with low GWP are A3 refrigerants with a small LFL and high flammability. Therefore, the Japan Refrigeration and Air Conditioning Industry Association have been carried out the risk assessments of built-in refrigerated display cabinets using A3 refrigerants. The calculation method that can accurately calculate the ignition probability for A3 refrigerants is proposed in this paper. And, the refrigerant leak analysis carried out to quantify the flammable space, the details of the risk assessment and established Japanese standards are explained.