Nonazeotropic working fluid media for use in thermodynamic cycle applications
OwnerChujun Guinventor
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Abstract
A nonazeotropic working fluid medium for use in a thermodynamic cycle system, comprising a mixture of compounds and characterized in that one or more vaporization loss/replenishment cycles of each less than about 15% of the total weight of the medium and cumulative up to about 50% of the total weight of the medium result in a total decrease in the coefficient of performance of said medium of no more than about 5%, or a loss in electric power generating efficiency of not more than about 3 percent.
Claims2
A nonazeotropic working fluid medium for use in a thermodynamic cycle system, comprising a mixture of compounds and characterized in that, when subject to one or more vaporization loss/replenishment cycles,:
- (a) the weight of the medium changes is less than about 15% of the total original weight of the medium per cycle, wherein the compounds and their weight concentrations are as follows:
- ______________________________________ CHClF.sub.2 (R22) 0.35-0.55 CH.sub.3 CHF.sub.2 (R152a) 0.05-0.30 CF.sub.3 CH.sub.2 F (R134a) 0.05-0.30 C.sub.4 F.sub.8 (RC318) 0.05-0.30, ______________________________________
- and wherein the maximum concentration of impurities in the medium is about 10 percent (by weight);
- and
- (b) cumulatively, over all cycles, the weight of the medium changes is no more than about 50% of the total original weight of the medium, resulting in:
- i) a total decrease in the coefficient of performance of said medium of no more than about 5%;
- or
- ii) a loss in electric power generating efficiency of not more than about 3 percent.
Dependencies are inferred from the claim text.