HEAT STORAGE MATERIAL, METHOD FOR PRODUCTION OF HEAT STORAGE MATERIAL, AND CHEMICAL HEAT PUMP

• US 20190331368A1
• Filed: 04/23/2019
• Published: 10/31/2019
• Est. Priority Date: 04/27/2018
• Status: Abandoned Application

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: TSUCHIYA, Kimihiro, OHASHI, Yoshio
• Application Number:
  US16/391,707
• Publication Number:
  US 20190331368A1
• Time in Patent Office: Days
• CPC Class Codes: C01F 11/00 Compounds of calcium, strontium, or barium C01F7/00 takes precedence
• CPC Class Codes: C01F 5/00 Compounds of magnesium
• CPC Class Codes: C01P 2002/34 perovskite-type (ABO3)
• CPC Class Codes: C09K 5/16 Materials undergoing chemical reactions when used
• CPC Class Codes: F25B 17/00 Sorption machines, plants or systems, operating intermittently, e.g. absorption or adsorption type
• CPC Class Codes: F28D 20/003 using thermochemical reactions
• CPC Class Codes: Y02E 60/14 Thermal energy storage
• CPC Class Codes: Y02P 20/129 Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

Abstract

A heat storage material has a high hydration capacity, which does not readily deliquesce and can be effectively used. A method produces such a heat storage material, and a chemical heat pump and heat storage method use such a heat storage material. The heat storage material is a composite metal halide including a monovalent metal, a divalent metal, and a halogen. The method for producing the heat storage material includes preparing a mixture in which a monovalent metal halide and a divalent metal halide hydrate are mixed, and generating the composite metal halide by subjecting the mixture to a heat treatment. The chemical heat pump includes a water storage unit storing water as a working medium, a heat storage material retention unit retaining the heat storage material, and a water vapor flow path allowing water to flow vapor between the water storage unit and the heat storage material retention unit.

Claims

1. A heat storage material, being a composite metal halide including a monovalent metal, a divalent metal, and a halogen.

2. The heat storage material according to claim 1, wherein the composite metal halide has a perovskite structure of the composition of either Formula (1) or (2) below:

ABX₃ 

 

(1)

A₂BX₄ 

 

(2)

wherein A is a monovalent metal, B is a divalent metal, X is a halogen, and A, B, and X may each be one or a combination of a plurality of elements having the same valency.

3. The heat storage material according to claim 2, wherein the composite metal halide has the perovskite structure of the composition of Formula (1).

4. The heat storage material according to claim 1, wherein the monovalent metal is selected from the group consisting of alkali metals and transition metals.

5. The heat storage material according to claim 4, wherein the monovalent metal is selected from the group consisting of potassium and cesium.

6. The heat storage material according to claim 1, wherein the divalent metal is selected from the group consisting of alkaline earth metals and transition metals.

7. The heat storage material according to claim 6, wherein the divalent metal is selected from the group consisting of magnesium and calcium.

8. The heat storage material according to claim 1, wherein the halogen is selected from the group consisting of chlorine, bromine, and iodine.

9. The heat storage material according to claim 8, wherein the halogen is chlorine.

10. A method for the production of the heat storage material according to claim 1, comprising the following steps:

preparing a mixture by mixing a monovalent metal halide and a divalent metal halide hydrate, and

generating the composite metal halide by subjecting the mixture to a heat treatment.

11. A chemical heat pump, comprising:

a water storage unit for storing water as a working medium,

a heat storage material retention unit for retaining the heat storage material according to claim 1, and

a water vapor flow path for allowing water vapor to flow between the water storage unit and the heat storage material retention unit.

12. A heat storage method, comprising performing, in the chemical heat pump according to claim 11, heat storage and heat dissipation by hydrating and dehydrating the working medium in the heat storage material.