Patent ID: 8658326

Claim:
A heat transfer system, comprising: a circulation loop defining a flow path for a heat transfer fluid; and a heat transfer fluid, comprising: a liquid coolant; a non-conductive colorant, wherein the non-conductive colorant is substantially free of functional groups selected from the group consisting of positively charged groups and negatively charged groups; a siloxane corrosion inhibitor of formula R 3 —Si—[O—Si(R) 2 ] x —OSiR 3 , wherein R is independently an alkyl group or a polyalkylene oxide copolymer of 1 to 200 carbons, x is from 0 to 100, and further wherein at least one alkyl group and at least one polyalkylene oxide copolymer are present; and a non-conductive emulsion-based polydiorganosiloxane antifoam agent; wherein the conductivity of the heat transfer fluid is less than 100 μS/cm; and wherein the heat transfer system comprises aluminum, magnesium, or a combination thereof, in intimate contact with the heat transfer fluid.