Phase change compositions
AssigneeUniversity of Dayton
InventorIval O. Salyer
Life of this patent
Estimating the term…
Abstract
Compositions containing crystalline, straight chain, alkyl hydrocarbons as phase change materials including cementitious compositions containing the alkyl hydrocarbons neat or in pellets or granules formed by incorporating the alkyl hydrocarbons in polymers or rubbers; and polymeric or elastomeric compositions containing alkyl hydrocarbons.
Claims18
A composite useful in thermal energy storage comprising a matrix having incorporated therein a phase change material, said phase change material being a crystalline, [straight] long chain, alkyl hydrocarbon having 14 or more carbon atoms and a heat of fusion greater than 30 cal/g., said composite also comprising a flame retarding agent selected from the group consisting of halogenated hydrocarbons and halogenated phosphates.
[10. The composite of claim 1 wherein said alkyl hydrocarbon is selected from the group consisting of Shellwax 100, Shellwax 120, Shellwax 200, Shellwax 300, Boron R-152, Union SR-143, Witco 128, Witco LLN, Witco 45A, Witco K-61, Witco K-51, Witco 85010-1,
- Aristowax 143 and Paraffin 150.] 11. The composite of claim 2 wherein said alkyl hydrocarbon is a blend of normal alkyl hydrocarbons containing
- 16 to 20 carbon atoms. 12. The composite of claim 1 wherein said halogenated hydrocarbon is selected from the group consisting of [Chlorowax 70-S,] tetrabromophthalic anhydride, tetrabromobisphenol A, and decarbomodiphenyl oxide;
- and said polyvalent metal oxide is antimony oxide, the weight ratio of said halogenated hydrocarbon to said antimony
- oxide being about 1:1 to 3:1. 13. A composite of claim 1 wherein said
- composite is a bridge deck. 14. A composite useful in thermal energy storage comprising a matrix material having incorporated therein a phase change material, said matrix material being plasterboard and said phase change material being a crystalline, [straight] long chain, alkyl hydrocarbon having 14 or more carbon atoms and a heat of fusion greater than 30 cal/g., said plasterboard also comprising a flane retardant agent incorporated therein said flame retarding agent being selected from the group consisting halogenated hydrocarbons and
- halogenated phosphates. 15. A composite useful in thermal energy storage comprising a matrix material having incorporated therein a phase change material and a flame retarding agent, said phase change material being a crystalline [straight] long chain alkyl hydrocarbon having 14 or more carbon atoms and a heat of fusion greater than 30 cal/g and said flame retarding agent being a brominated hydrocarbon which is
- miscible in said phase change material. 16. The composite of claim 15 wherein said brominated hydrocarbon is a brominated cycloalkylalkanes.
- The composite of claim 16 wherein said brominated cycloalkylalkane is
- dibromoethyldibromocyclohexane. 18. The composite of claim 1 wherein said flame retarding agent is a flame retarding agent selected from the group consisting of tri(beta-chloroisopropyl) phosphate and
- tri(beta-chloroethyl)phosphate.
A method of thermal energy storage comprising providing a composite in thermally stable form and formed of a first material and a second material which is different from said first material, and which has a melting point less than said first material, but which is compatible with said first material, said first material comprising an inorganic cementitious matrix which serves as a containment means for said second material, said second material comprising a crystalline alkyl hydrocarbon material containing 14 or more carbon atoms or mixtures thereof and having a heat of fusion greater than about 30 cal/g, said second material being contained within the matrix of said first material, and subjecting said composite to changes in temperature whereby said composite either conserves heat or cool.
The method of claim 23 wherein said crystalline alkyl hydrocarbon is used in combination with a wetting agent.
The method of claim 25 wherein said crystalline alkyl hydrocarbon is used in combination with a
- wetting agent.
Dependencies are inferred from the claim text.