3Decisions adopted by the nineteenth meeting of the parties to the montreal protocol on substances that deplete the ozone layer[EB/OL], http://www.ozone.unep.org/.
4ISO 817: 2005[S/OL]. http://isotc.iso.org/.
5H Fujino, et al. Heat transfer performance in horizontal tube of HFC-32[C]//JSRAE Meeting, 1999.
6Ryuzaburo Yajima, et al. R32 as a solution for energy conservation and low emmision[C]//JSRAE Meeting, 1999.
