Application of non aqueous fluids based on alkylene glycol monoether as heat transfer agent

Claim 1

In a process for transferring heat in a cooling circuit or heat exchanger heating circuit having parts of a light alloy based on magnesium and parts of elastomers or rubbers, and operating in a temperature range from -60° to +200° C., the improvement which comprises using as a heat transfer medium a non aqueous fluid essentially consisting of: (a) 100 parts by weight of one or more alkylene glycol monoethers (A) of general formula R.sup.1 O (CH.sub.2 CHR.sup.2 O).sub.m H in which m is an integer equal to 1 or 2, R 1 is an alkyl radical comprising a number of carbon atoms from 4 to 8 when m=1, or from 1 to 5 when m=2, and R 2 is a hydrogen atom or a methyl radical. (b) 0 to 30 parts by weight of one or more alkylene glycol monoethers (b) of the general formula R 3 O (CH 2 CHR 4 O) n H in which n is an integer from 1 to 6, R 3 is an alkyl radical comprising a number of carbon atoms from 1 to 3 when m=1, from 6 to 8 when n=2, or from 1 to 8 when n has a value of 3 to 6, and R 4 is a hydrogen atom or a methyl radical, (c) 0 to 40 parts by weight of one or more diols (C) of the general formula HO(CH.sub.2 --CHR.sup.5 O).sub.p H in which p is an integer from 1 to 3, and R 5 is a hydrogen atom or a methyl radical. (d) 0 to 5 parts by weight in relation to the composition of one or more additives soluble in the composition chosen amongst corrosion inhibiting agents, mineral or organic bases and antifoaming or anitprecipitating agents.