Patent ID: 7854253

Claim:
A heat transfer system, comprising a circulation loop defining a flow path for a corrosion inhibiting liquid heat transfer fluid having a conductivity of less than 10 μS/cm and comprising a corrosion inhibitor comprising an azole compound, and at least one of a siloxane based surfactant, colloidal silica, or mixtures thereof; wherein the siloxane based surfactant comprises a polysiloxane of the general formula R 3 —Si—[O—Si(R) 2 ] x —OSiR 3 wherein R is an alkyl group or polyalkylene oxide copolymer of from 1 to 200 carbons and x is from 0 to 100, and the polysiloxane has at least one R group that is a polyalkylene oxide copolymer of one or more alkylene oxides having from 2 to 6 carbons.