成果報告書詳細
管理番号20150000000193
タイトル*平成26年度中間年報 「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 エアコン用低GWP冷媒の性能および安全性評価」(H23-H27)
公開日2015/7/18
報告書年度2014 - 2014
委託先名国立大学法人東京大学
プロジェクト番号P11008
部署名環境部
和文要約ノンフロン型空調機器用低GWP冷媒の性能評価と安全性評価をするために、下記研究項目を実施した。
東京大学担当:
(1)エアコンの性能評価法の確立
・微細多孔蒸発管内の冷媒R1234yfの沸騰流動に対する潤滑油の影響
(2)室内への冷媒リーク時の安全性評価
・微燃性冷媒が室内へ漏洩したときの濃度分布の解析
・熱分解、燃焼後のHF濃度解析
・リスク評価
(3)低GWP冷媒の固有特性に係る安全性評価
・開発低GWP冷媒を適用した空調機器使用時における自己分解反応リスク評価
産総研担当:
(1)ノンフロン型冷媒の実用条件の燃焼性評価
・HFO-1234ze(Z)の燃焼限界
・HFO-1234ze(Z)の燃焼速度
・不燃性ガスの不燃度
・R32の熱分解及び生成物
(2)ノンフロン型冷媒の着火エネルギー(MIE)評価法の開発
・消炎距離、消炎直径の評価、最小着火エネルギー評価法の開発
・実用条件の着火エネルギー評価
英文要約(1) Simulation of leakage of mildly flammable refrigerants
Diffusion phenomena were numerically analyzed when a refrigerant leaked from a chiller into a large space where these were equipped. From the calculation results, the refrigerant concentration distributions, the volumes and positions of the flammable regions, and their changes in time were discussed. In the case of leakage from a water-cooled chiller, the air ventilation is effective to restrict the VFL.
(2) Thermal decomposition products of lower-GWP refrigerants
To discuss on the effects of temperature and humidity in thermal decomposition, mixtures of refrigerants and air were decomposed in heated tube and the products were analyzed with FT-IR to quantify decomposed refrigerants and hydrogen fluoride which was the main toxic product. The temperature of the heated tube and humidity in the mixture were systematically changed.
(3) Diesel combustion during pump down operation of heat pumps
We aimed to reproduce the diesel combustion that may occur during the pump-down of air conditioners and measured the pressure inside the compressor when this combustion occurred. The accidents that may occur during pump-down are caused by the diesel combustion of the air, refrigerant.
(4) Results of AIST
Recently HFO-1234ze(Z) has been closed up as another 2L class related refrigerant. The flammability limits were measured for this compound. It has been found to be non-flammable in dry air but flammable in moist air. The moist air here means 50% relative humidity corrected for 23 degree C.
Burning velocity measurement of HFO-1234ze(Z) was carried out in microgravity environment to remove the effect of buoyancy. The maximum burning velocity was obtained to be 1.9 cm/s, which was slightly higher than R1234yf.
Quenching distance measurement of R1234yf was carried out in microgravity environment and we obtained concentration dependence of the quenching distance. We also obtained extinction diameter of R1234yf as a function of distance between ignition source and opening of the enclosure. Based on the results of quenching distance, we designed a new ignition system which we believe is suitable for ignition energy measurement of 2L refrigerants.
To elucidate ignition and quenching in the practical conditions, ignition probability was examined by using electrodes of a magnetic contactor. R32 was used as a refrigerant. Concerning the structure of the enclosure of magnetic contactor, the partition between each pair of electrodes significantly decreased ignition probability. On the other hand, the ceiling of enclosure did little affect ignition probability.
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