Dielectric heat-transfer fluid

Abstract

Provided is a use of a vegetable oil high in monounsaturates as dielectric and heat-transfer fluid in a device for the generation, storage, conversion and/or distribution of electrical energy.

1 . A use of a soy oil as a heat-transfer dielectric fluid in a device to generate, store, convert and/or distribute electrical energy, wherein the soy oil is one in which at least 70% of the fatty acids are C14 to C22 mono-unsaturated, and less than 16% of the fatty acids are polyunsaturated. 
     
     
         2 . The use according to  claim 1 , wherein the soy oil has less than 6% of polyunsaturated fatty acids. 
     
     
         3 . The use according to  claim 1  or  2 , wherein the soy oil has at least 80% content of monounsaturated C 14  to C 22  fatty acids. 
     
     
         4 . The use according to any preceding claim, wherein the soy oil has a saturated fatty acid content of less than at or about 12%. 
     
     
         5 . The use according to any preceding claim, wherein the soy oil has a saturated fatty acid content of less than at or about 10%. 
     
     
         6 . The use according to any preceding claim, wherein the soy oil has less than 4% of polyunsaturated fatty acids. 
     
     
         7 . The use according to any preceding claim, wherein the monounsaturated fatty acids are C 18  monounsaturated fatty acids. 
     
     
         8 . The use according to any preceding claim, wherein the monounsaturated fatty acids are oleic acid. 
     
     
         9 . The use according to any one preceding claim, wherein the polyunsaturated fatty acids are C 18  fatty acids having two or three double bonds, preferably C18:2 and/or C18:3. 
     
     
         10 . The use according to any one preceding claim, wherein the soy oil has the following fatty acid content: at or about 6% C16:0, 3% C18:0, 86% C18:1, 2% C18:2 and 2% C18:3. 
     
     
         11 . The use according to any one preceding claim, wherein the soy oil has the following fatty acid content: at or about 6% C16:0, 4% C18:0, 79% C18:1, 4% C18:2, 2% C18:3. 
     
     
         12 . The use according to any one preceding claim, wherein the soy oil has the following fatty acid content: at or about 7% C16:0, 4% C18:0, 70% C18:1, 13% C18:2, 3% C18:3. 
     
     
         13 . The use according to any one preceding claim, wherein the soy oil has the following fatty acid content: at or about 6% C16:0, 4% C18:0, 74% C18:1, 9% C18:2, 3% C18:3. 
     
     
         14 . The use according to any one preceding claim, wherein the soy oil has the following fatty acid content: at or about 6% C16:0, 4% C18:0, 78% C18:1, 4% C18:2, 2% C18:3. 
     
     
         15 . The use according to any one preceding claim, wherein the soy oil additionally comprises tocopherol antioxidants, at a concentration of at least 85 mg/100 g of oil. 
     
     
         16 . The use according to  claim 15 , wherein the tocopherol is naturally occurring tocopherols. 
     
     
         17 . The use according to any one preceding claim, wherein the soy oil is derived from a seed plant that has been genetically manipulated to increase expression of the gene encoding oleoyl 12-desaturase. 
     
     
         18 . The use according to any one preceding claim, wherein the content of C18:2 is less than at or about 5%. 
     
     
         19 . A device to generate, store, convert and/or distribute electrical energy, comprising:
 (a) a conducting material;   (b) a dielectric material; and   (c) a heat-transfer dielectric fluid, which is a soy oil in which at least 75% of the fatty acids are C 14  to C 22  mono-unsaturated, and less than 7% of the fatty acids are polyunsaturated.   
     
     
         20 . A device according to  claim 19 , wherein the soy oil is the vegetable oil described in any one of  claims 1 - 18 . 
     
     
         21 . A device according to  claim 19  or  20 , wherein the dielectric material is paper or board made of cellulose or aramid, polyimides, polyphenylsulfones, polyamides, polyesters (e.g. PET) and polyethylene and combination therewith in various forms such composites, laminates, morphologically tailored surfaces and/or multidimensional structures and hybrids/mixtures thereof. 
     
     
         22 . A method for preconditioning a heat-transfer dielectric fluid which is a vegetable triacylglycerol, comprising the step:
 (a) exposing said fluid to a constant and uniformly distributed electromagnetic field.   
     
     
         23 . The method according to  claim 22 , wherein the electromagnetic field is in the form of microwaves, which are applied at sufficient power and for sufficient time to heat the vegetable triacylglycerol to at least at or about 100° C., but not higher than at or about 170° C. 
     
     
         24 . A dielectric material comprising an organic fibrous structure (e.g. woven or non-woven) impregnated with at least 10% wt of a vegetable triacylglycerol and/or mixtures in which at least 75% of the fatty acids are C 14  to C 22  mono-unsaturated, and less than 7% of the fatty acids are polyunsaturated. 
     
     
         25 . The dielectric material of  claim 24 , wherein the vegetable triacylglycerol has less than 6% polyunsaturated fatty acids. 
     
     
         26 . A blended high oleic oil with an improved Df value at a constant temperature comprising:
 a) a first oil in the range of 1-100 vol % that is a high oleic soybean oil; and   b) a second oil in the range of 1-100 vol %; and   c) wherein the blended high oleic oil has an oleic acid content of at least 70%; and wherein the Df value, at a constant temperature, of the blended high oleic oil is improved when compared under the same conditions to an oil not comprising the high oleic soybean oil.   
     
     
         27 . The blended high oleic oil of  claim 26 , having a Df of less than at or about 1.2×10 −3  when measured at 23° C. 
     
     
         28 . The blended high oleic oil of  claim 26 , having a Df of less than at or about 5.4×10 −3  when measured at 70° C. 
     
     
         29 . The blended high oleic oil of  claim 26 , having a Df of less than at or about 9.1×10 −3  when measured at 90° C. 
     
     
         30 . The blended high oleic oil of  claim 26 , having a Df of less than at or about 1.21×10 −2  when measured at 100° C. 
     
     
         31 . The blended high oleic oil of  claim 26 , having a Df of less than at or about 1.95×10 −2  when measured at 120° C. 
     
     
         32 . The blended high oleic oil of  claim 26 , having a Df of and less than at or about 2.32×10 −2  when measured at 130° C. 
     
     
         33 . The blended high oleic oil of  claim 26 , having a Df of less than 2.32×10 −2  over a temperature range of at or about 23-130° C. 
     
     
         34 . The blended high oleic oil of  claim 26 , having a Df of less than at or about 2.5×10 −4  when measured at 23° C. 
     
     
         35 . The blended high oleic oil of  claim 26 , having a Df of less than at or about 1.5×10 −3  when measured at 70° C. 
     
     
         36 . The blended high oleic oil of  claim 26 , having a Df of less than at or about 3×10 −3  when measured at 90° C. 
     
     
         37 . The blended high oleic oil of  claim 26 , having a Df of less than at or about 4×10 −3  when measured at 100° C. 
     
     
         38 . The blended high oleic oil of  claim 26 , having a Df of less than at or about 7×10 −3  when measured at 120° C. 
     
     
         39 . The blended high oleic oil of  claim 26 , having a Df of and less than at or about 1×10 −2  when measured at 130° C. 
     
     
         40 . The blended high oleic oil of  claim 26 , having a Df of less than 0.01 over a temperature range of at or about 23-130° C. 
     
     
         41 . A blended high oleic oil with an improved Df value at a constant temperature comprising:
 a) a first oil in the range of 1-100 vol % that is a high oleic soybean oil; and   b) a second oil in the range of 1-100 vol % that is a mono-alkyl ester of oleic acid; and   c) a third oil in the range of 1-100 vol %; and   d) wherein the blended high oleic oil has an oleic acid content of at least 80%; and wherein the Df value, at a constant temperature, of the blended high oleic oil is improved when compared under the same conditions to an oil not comprising the high oleic soybean oil and/or the purified oleic acid and/or any isolated components of the oil that is required to improve the performance of the said high oleic blend.   
     
     
         42 . The oil of any one of  claims 26 - 41 , wherein the oil comprises at least one antioxidant, selected from the group consisting of: tocopherols, tocotrienols, naturally occurring tocopherols, naturally occurring tocotrienols, Lubrizol 7653, TBHQ, Decanox MPS-90, and/or natural plant extracts.