HEAT CARRIER AS ANTIFREEZE Russian patent published in 1998 - IPC

FIELD: refrigeration engineering, heat-exchanger and heating devices. SUBSTANCE: heat carrier comprises, mas.%; bishophite, 35-45; bichromate of alkaline metal, 0.5-0.7; hydroxide of alkaline metal, 0.2-0.3; carbamide, 0.5-1.5; water, the balance. Freezing point of desired aqueous-salt heat carrier is up to -5 C, its boiling point is up to 120 C, desired antifreeze also has high bulk heat conductivity, its coefficient of heat transfer is by 20-30 % higher that for fresh water. It also possesses low corrosion activity with respect to metals and has purification ability with respect to scale depositions. EFFECT: improved quality of desired product. 2 tbl