トピックス TOPICS

Simulation of leakage of mildly flammable refrigerants

The use of chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) has been widely restricted. They have been replaced with hydrofluorocarbons (HFCs) in order to protect the ozone layer. However, the leakage of refrigerant into the air from active or end-of-life air conditioners is a serious environmental issue owing to the high global warming potential (GWP) of HFCs. Therefore, replacing HFCs with low-GWP refrigerants has been recognized as a reasonable solution to the problem. In Japan, low-GWP refrigerants such as R1234yf, R1234ze, and R32 have been considered as alternatives to conventional HFC refrigerants. However, these low-GWP refrigerants are often flammable.

Numerical analysis is an effective tool in order to understand the refrigerant diffusion phenomena of low-GWP refrigerants because it is very difficult to measure the diffusion of a refrigerant in a large space. In this study, diffusion phenomena were numerically analyzed when a refrigerant leaked slowly from a room air conditioner (RAC) and package air conditioner (PAC) and rapidly from a chiller into a large space. Based on the calculation results, the refrigerant concentration distributions, the volumes and positions of the flammable regions, and their changes in time were examined.

論題
Simulation of leakage of mildly flammable refrigerants
著者
Hiroaki OKAMOTO, Tatsuhito HATTORI, Chaobin DANG, and Eiji HIHARA
掲載誌
Proceedings of International Refrigeration and Air Conditioning Conference at Purdue, No.2459, July 14-17, 2014

関連資料

同じカテゴリの最新記事

生活行動に基づく需要発生メカニズムの検討 -在宅勤務を例に-

弊社 副主席研究員 水谷と研究員 岩本が、第41回エネルギー・資源学会研究発表会で研究発表を行いました。 【背景・目的】 近年デジタ... [続きを読む]

北海道における暖房の効率的利用を促すメッセージ手法の検証

北海道に在住のWEB調査モニター720名を、介入群3グループと対照群の計4グループに分け、介入群にはそれぞれ暖房の省エネ行動を促すメッセージをフレー... [続きを読む]

北海道における高効率エアコン選択を促すメッセージ手法の検証

北海道に在住のWEB調査モニター720名を、介入群3グループと対照群の計4グループに分け、仮想のエアコン購買場面での商品選択実験を行った。介入群には... [続きを読む]

若年層の環境意識向上を促す情報提供手法の実証調査

(1) 目的: 欧州を中心とする諸外国では気候変動に対する危機意識、関心がミレニアル世代やZ世代を中心に高まっており、ライフスタイルの変化や投票... [続きを読む]

住環境計画研究所

営業時間 9:30 – 17:30
TEL:03-3234-1177
お気軽にお問合せください