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US7404911: Heat-transfer media having improved thermal stability and based on higher polyglycols
8 Claims, No Drawings
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.
- 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.
- 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.
U.S. Patent Documents
Foreign Patent Documents
* cited by examiner
|English Language Abstract of DE 195 25 090, Jan. 16, 1997.|
|Korrosionsuntersuchungen in Waermetraegern fuer Solaranlagen, Arbeitsgemeinschaft Korrosion E.V., (1988) p. 297-304, vol. 39, Germany.|
|Hillerns, F., et al., Korrosionsschutz und Thermische Belastbarkeit, Solarwaerme, (May 1999) pp. 25-27, Germany.|
|German Patent Office Action for corresponding Application DE102006004895.4, issued Dec. 22, 2006.|
|English Language Abstract for DD 219033 A3, Feb. 20, 1985.|
|English Language Abstract for AT 206414 B, Nov. 25, 1959.|
|EP Office Action for corres. Application No. EP 07001110.1, Mar. 19, 2007.|
|English Language Machine Translation of EP 0025011, published on Mar. 11, 1981 (Abstract, Description and Claims).|
|English Language Machine Translation of DE 19525090, published Jan. 16, 1997 (Decsription and Claims).|
The current document is not referenced by other documents.