Risk Assessment for VRF System with Mildly Flammable Refrigerants

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  • YAJIMA Ryuzaburo
    The Japan Refrigeration and Air Conditioning Industry Association
  • KIGUCHI Yukio
    The Japan Refrigeration and Air Conditioning Industry Association
  • SEKINE Takashi
    The Japan Refrigeration and Air Conditioning Industry Association
  • SASAKI Shunji
    The Japan Refrigeration and Air Conditioning Industry Association
  • ITO Shuntaro
    The Japan Refrigeration and Air Conditioning Industry Association
  • YAMASHITA Koji
    The Japan Refrigeration and Air Conditioning Industry Association
  • KANNON Tatsumi
    The Japan Refrigeration and Air Conditioning Industry Association

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Other Title
  • 微燃性冷媒を用いたビル用マルチエアコンのリスクアセスメント
  • ビネンセイレイバイ オ モチイタ ビルヨウ マルチエアコン ノ リスクアセスメント

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Description

The risk assessments were performed for VRF system with mildly flammable refrigerants. The probabilities of fire were estimated in the most severe installation cases at each life stage, indoor and outdoor operations, storage, installation, repairing and removal. Refrigerant leak velocity were calculated from the results of investigation of the diameter of leak hole at each parts recovered from real market. And the probability of rapid leak were estimated from the number of reporting from customers and service persons. If the probability of fire at the installation case without measure exceeded the given allowable level, we proposed the safety measures that can reduce the probability lower than the allowable level, once every 100 years. With these safety measures, it is clarified that the fire risk was able to be lower than the allowable level. It is necessary in the next step that we summarize these safety requests and establish them as the technical industry standard.

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