초록 ▼

The present invention relates to heat-transfer concentrates for solar installations, containing a) from 92 to 99% by weight of at least one polyglycol of the formula R--O--(CH2--CH2--O)n--H, in which n is an integer of from 3 to 500 and R is H, a C1-to C4-alkyl group or an aromatic radical having 6

The present invention relates to heat-transfer concentrates for solar installations, containing a) from 92 to 99% by weight of at least one polyglycol of the formula R--O--(CH2--CH2--O)n--H, in which n is an integer of from 3 to 500 and R is H, a C1-to C4-alkyl group or an aromatic radical having 6 to 12 carbon atoms, b) from 1 to 8% by weight of at least one corrosion inhibitor, with the proviso that its content of ethylene glycol and 1,2-propylene glycol is less than 0.2% by weight.

대표청구항 ▼

The invention claimed is: 1. A heat-transfer concentrate containing a) from 92 to 99% by weight of a mixture of triethylene glycol and tetraethylene glycol in a mixing ratio of from 3:1 to 1:3, b) from 1 to 8% by weight of at least one corrosion inhibitor, with the proviso that said concentrate has

The invention claimed is: 1. A heat-transfer concentrate containing a) from 92 to 99% by weight of a mixture of triethylene glycol and tetraethylene glycol in a mixing ratio of from 3:1 to 1:3, b) from 1 to 8% by weight of at least one corrosion inhibitor, with the proviso that said concentrate has less than 0.2% by weight of ethylene glycol and 1,2-propolene glycol. 2. The heat-transfer concentrate of claim 1, wherein the at least one corrosion inhibitor is selected from the group consisting of borates, silicates, amines, triazoles, thiazoles, molybdates, nitrates, sodium benzoate, and a salt of a mono-, di-or tricarboxylic acid. 3. The heat-transfer concentrate of claim 1, wherein the corrosion inhibitor ranges from 2 to 7% by weight of said concentrate. 4. The heat-transfer concentrate of claim 1, wherein the mixture ranges from 94 to 98% by weight of said concentrate. 5. The heat-transfer concentrate of claim 1, wherein ethylene glycol and 1,2-propylene glycol is less than 0.1% by weight of said concentrate. 6. A heat-transfer medium for solar installations, containing from 30 to 70% by weight of the heat-transfer concentrate of claim 1 and water to 100% by weight. 7. The heat-transfer medium of claim 6, wherein said heat-transfer medium contains: a) 45 to 55% by weight of the mixture of triethylene glycol and tetraethylene glycol in a mixing ratio of from 3:1 to 1:3, b) 1 to 4% by weight of the at least one corrosion inhibitor, and c) 45 to 55% by weight of water with the proviso that said concentrate has less than 0.1% by weight of ethylene glycol and 1,2-propylene glycol. 8. A method for transporting heat or cold in a thermal solar installation, said method comprising circulating a heat-transfer medium in said thermal solar installation, wherein the heat-transfer medium contains a heat-transfer concentrate and water, said heat-transfer medium consisting of a) from 45 to 55% by weight of a mixture of triethylene glycol and tetraethylene glycol in a mixing ratio of from 3:1 to 1:3, b) from 1 to 4% by weight of at least one corrosion inhibitor and c) from 45 to 55% by weight of water, wherein said heat-transfer concentrate has less than 0.2% by weight of ethylene glycol and 1,2-propylene glycol.