| 翻訳と辞書 |
R-407c
R-407c is a mixture of hydrofluorocarbons used as a refrigerant. It is a zeotropic blend of difluoromethane (R-32), pentafluoroethane (R-125), and 1,1,1,2-tetrafluoroethane (R-134a). Difluoromethane serves to provide the heat capacity, pentafluoroethane decreases flammability, tetrafluoroethane reduces pressure.〔(A brief history of refrigerant )〕 R-407c cylinders are colored burnt orange.
This refrigerant is intended as a replacement for R-22. R-22 has been scheduled to be phased out by the year 2035. Already there is no equipment available with R-22 as its refrigerant. Currently some manufacturers are making replacement equipment available with a holding charge of nitrogen. It is best to put R-407c in these because they have polyolester oil.
It is not recommended to drop R-407c into R-22 systems on top of the existing charge in cases of low refrigerant levels. A licensed professional should be contracted to completely remove the R-22 and as much of the mineral oil as possible. In the case of compressor change-outs, replacement compressors are already manufactured with POE oil and are therefore more compatible with R-407c than returning the recovered R-22. The recovered R-22 can be sent to a facility for disposal.
It is cost effective to replace R-22 with R-407c before there is an emergency. Preventive maintenance programs should include strong suggestions to replace ozone depleting refrigerants such as R-22 with environmentally friendly refrigerants and it looks like R-407c has become the front runner. There are millions and millions of tons of R-22 in air conditioning and refrigeration equipment in use today and most of it is destined to end up in the atmosphere in spite of efforts to curtail this probability. These efforts have been in place since the late 1980s.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「R-407c」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|