成果報告書詳細
管理番号20130000000375
タイトル*平成24年度分中間年報 高効率ノンフロン型空調機器技術の開発  冷媒の性能、安全性評価  微燃性冷媒の燃焼・爆発性評価と空調機器使用時のリスクアセスメント
公開日2013/7/27
報告書年度2012 - 2012
委託先名学校法人東京理科大学
プロジェクト番号P11008
部署名環境部
和文要約微燃性冷媒の燃焼性・爆発性を実験的及び数値的に評価するとともに、実際の居住空間において発生しうる事故シナリオとして、暖房機器や、サービス・据え付け時のバーナー等による火災危険性を明らかにすることを目的として、下記研究項目を実施した。
(1)微燃性冷媒の燃焼爆発影響評価
・火炎速度と燃焼速度の評価
・水分の存在による影響評価
・爆発強度指数KG値の評価
・A2L/2L冷媒の燃焼シミュレーションの検討
(2)微燃性冷媒の過剰なエネルギーによる燃焼爆発評価
(3)暖房機器と同時使用時の安全性評価
(4)サービス・据え付け時の安全性評価
・電子ライター使用時の安全性評価
・ピンホール漏洩時の安全性評価
・メンテナンス機器内での漏洩時の安全性評価
英文要約In this project, we examined the combustion properties of low flammable refrigerants based on the conceivable accident scenarios.This project consists of five sub-themes; following sub-themes mainly have been tackled in FY2012. 1) Physical Risk Assessment of Low Flammable Refrigerant Combustion (AIST) a) Combustion and explosion assessment: A2L refrigerants have such a low burning velocity of less than 10 cm/s, a lift up a flame front due to buoyancy effect become prominent in their combustion behaviors. To observe and evaluate the effect of buoyancy on flammable properties of R32 and R1234yf, a large volume spherical vessel was prepared, and the flame propagation behavior of the gases was observed using a high-speed video camera and a flame propagation velocity was estimated by the image analysis. A burning velocity, maximum peak pressure and deflagration index KG were evaluated. Ignition tests in mixture gases by an electric discharge were conducted varying an equivalent ratio and humidity. b) Combustion and explosion by excess energy: As the estimation of potential risk of explosion, which includes detonation, a comparing investigation of explosion characteristics such as minimum ignition energy (MIE), detonation limit, and KG on other flammable gases expect to be very informative. Some data on Pmax, KG, burning velocity, and flammability and detonation limit are summarized. To estimate autoignition characteristics of A2L/2L refrigerants, the test will be conducted according to ASTM E 659 standard test method. 2) Physical hazard evaluation in the service and maintenance (Tokyo University of Science) In this subtheme, following three conceivable scenarios were focused. a) Hazards by a piezo lighter: In this case, we focused on lighters for smoking as the ignition source. We focused on only the piezo lighter as the ignition source. Even if a piezo lighter was used in the ambient of leaked and stayed A2L refrigerant, flame propagation wasn’t observed because of two major reasons; one is the ignition energy of n-butane/A2L refrigerants is much greater than the electric spark of piezo, and the other is that fuel velocity is much faster than the burning velocity of A2L refrigerants. b) Hazards by the rapid leak from a pinhole: In this case, ignition hazard when the A2L refrigerant leaked from a pinhole on the pipes and/or hoses was focused and examined experimentally. Flammable zone was formed locally and the jet flame was not formed in all of cases in the present experiments. c) Hazards in the service and maintenance device: In this case, ignition hazard in the case that A2L refrigerant leaked in the device of service and maintenance was examined experimentally. R1234yf in the model collection device diffused through the oncoming slit, and if the collection device has oncoming slit that width of 20 mm, ignition and flame propagation was not observed even if the concentration of R1234yf at the ignition source was until within the flammable range.
ダウンロード成果報告書データベース(ユーザ登録必須)から、ダウンロードしてください。

▲トップに戻る