Some Evaluation Results of HFC134a/PAG Mixtures for Refrigeration

HFC134a(CH2 FCF3) is primarily developed as an alt.ernat.ive t.o t.he ozone depleting refrigerant. CFC12(CC12F2). In t.he case of t.he subst.it.ut.ion of refrigerants for home refrigerators, a t.est., which is aimed at. t.he evaluation of t.he influences on t.he material in t.he refrigerant. in cycle, is necessary as well as thermodynamic charact.erist.ic t.est.. The t.est.ing required includes bot.h laboratory and syst.em work. In order t.o make judgements about. t.he reliability and performance of proposed new syst.em, laboratory dat.a are t.o be used. Therefore t.he laboratory t.est.ing has t.o simulate syst.em work. This paper present.s some laboratory dat.a t.hat. may be needed in t.his effort.. (1)The st.abilit.y of HFC134a and polyalkylen glycols(PAG), which are t.he leading candidat.e for lubrication of HFC134a, is discussed by using sealed glass t.ubes. Aft.er t.he t.est. , · gas analysis usig t.he gas chromatograph is used in order t.o know t.he decompos 1 t.ion mechanism of ItFC13 4 a/PAG mixt.urers. Furt.her, in order t.o determine t.he effect. of wat.er and molecular sieve on st.abilit.y we t.est.ed. ( 2) The heat. res ist.ance of PAG is studied by new met.hod called Chemiluminescence(t.o be referred t.o as CL). ( 3 l The effectiveness of lubrication is t.est.ed by HAYAMA wear t.est.er and MAX-WEILAND met.hod. In addit.ion,t.he effect. of wat.er on lubrication is furt.her discussed. (4)The compat.ibilit.y of t.he HFC134a/PAG mixt.ures wit.h magnetic wire is discussed by autoclave met.hod in consideration of t.he influence of t.he wat.er. (S)The compat.ibilit.y of t.he HFC134a/PAG mixtures wit.h insulation film is also discussed by autoclave met.hod in consideration of t.he influence of t.he wat.er. INTRODUCTION In 1974, Rowland and Molina published t.heir hypothesis t.hat t.he atmospheric ozone was being deplet.ed by chlorofluorocarbon compounds( CFCs 11,12,113,114, and 115), leading t.o int.ernat.ional agreement. to reduce CFC prduct.ion. The 1987 Mont.oreal Prot.ocol, under t.he auspices of t.he Unit.ed Nat.ions Environmental Programme(UNEP), established a plan t.o reduce CFC production t.o 50% of 1986 levels by mid-1998, beginning wit.h a return t.o 1986 levels in mid1989. Subsequent. scientific information on ozone level reductions great.er t.han expected provided t.he impet.us for a reassessment. of t.he adequency of t.he Mont.real Prot.ocol