Patent ID: 8024937
Filing Date: 2011-09-27
Classification: C09K,F25B,G01M

Abstract:
1. A method for detecting a leak of heat transfer composition in a closed loop heat transfer system, comprising measuring the pressure of the heat transfer composition with a pressure measuring device disposed within said heat transfer system at a first time, and measuring the pressure of the heat transfer composition at a second time later than the first time, and comparing the pressure measured at the first time with the pressure measured at the second time, wherein a drop in pressure from the first time to the second time indicates a leak; wherein said heat transfer composition comprises at least one compound selected from the group consisting of hydrofluorocarbons, fluoroethers, fluoroolefins, hydrocarbons, CF 3 I, NH 3 , CO 2 , and mixtures thereof; provided that said heat transfer composition comprises at least one fluoroolefin selected from the group consisting of: (i) fluoroolefins of the formula E- or Z—R (ii) cyclic fluoroolefins of the formula cyclo-[CX=CY(CZW) (iii) fluoroolefins selected from the group consisting of: and wherein said fluoroolefin can be any mixture of any compounds from (i), (ii), and (iii) above.