Heat storage material composition, heat storage device, and heat storage method

Patent metadata

Field	Value
Publication number	US-9758710-B2
Application number	US-201514857673-A
Country	US
Kind code	B2
Filing date	Sep 17, 2015
Priority date	Sep 29, 2014
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

A heat storage material composition contains a sugar alcohol and a stabilizer that allows the sugar alcohol to maintain a liquid state and a supercooled state. The stabilizer is one selected from (i) a salt that has a solubility of 9 g or more in 100 mL of 20° C. water and gives a monovalent anion, (ii) a polymer prepared by using the salt as a monomer, and (iii) a polymer having a molecular weight of 7,000 or more and 4,000,000 or less prepared by using, as a monomer, an alcohol having a solubility of 9 g or more in 100 mL of 20° C. water.

First claim

What is claimed is:

1. A heat storage material composition comprising:
a sugar alcohol; and
a stabilizer that allows the sugar alcohol to maintain a liquid state and a supercooled state, the stabilizer being
a salt that has a solubility of 9 g or more in 100 mL of 20° C. water and gives a monovalent anion, the salt being one selected from the group consisting of a carboxylate, calcium chloride, sodium acetate, a hydroxide, a nitrate, a hydrogencarbonate, and a benzoate.

2. The heat storage material composition according to claim 1 , wherein the hydroxide is sodium hydroxide.

3. The heat storage material composition according to claim 1 , wherein the nitrate is sodium nitrate or silver nitrate.

4. The heat storage material composition according to claim 1 , wherein the hydrogencarbonate is sodium hydrogencarbonate.

5. The heat storage material composition according to claim 1 , wherein the benzoate is sodium benzoate or potassium benzoate.

6. The heat storage material composition according to claim 1 , wherein the sugar alcohol is erythritol.

7. A heat storage device comprising:
the heat storage material composition according to claim 1 ; and
a pair of electrodes arranged to be in contact with the heat storage material composition,
wherein at least one of the pair of electrodes contains silver or a silver compound or the heat storage material composition contains a silver ion when in a liquid state, and
when the heat storage material composition is in a liquid state and in a supercooled state, voltage is applied between the pair of electrodes so as to release the supercooled state of the heat storage material composition.

8. A heat storage method comprising:
increasing a temperature of the heat storage material composition according to claim 1 to a temperature equal to or higher than a melting point of the sugar alcohol so as to melt the sugar alcohol in a solid state;
maintaining the temperature of the heat storage material composition to a temperature lower than the melting point of the sugar alcohol and maintaining the heat storage material composition in a supercooled state;
solidifying the sugar alcohol; and
recovering at least part of heat released from the heat storage material composition as a result of solidification of the sugar alcohol.

9. The heat storage material composition according to claim 1 , wherein
0.10≦Ws/Wa ≦0.3, where
Ws is a mass of the stabilizer contained in the heat storage material composition, and Wa is a mass of the sugar alcohol contained in the heat storage material composition.

10. The heat storage material composition according to claim 1 , wherein the salt is one selected from the group consisting of a sodium acetate, an ammonium acetate, a potassium acetate, a sodium hydroxide, a calcium chloride, a sodium nitrate, a silver nitrate, a sodium benzoate, and a potassium benzoate.

Assignees

• Panasonic Corp

Inventors

• Suzuki Motohiro
• Machida Hironobu
• Takeguchi Shinsuke
• Shii Kentaro
• Hirasawa Izumi
• Morioka So

Classifications

• C09K5/063 Primary

  Materials absorbing or liberating heat during crystallisation; Heat storage materials · CPC title

• F28D20/0034

  using liquid heat storage material · CPC title

• Y02E60/14

  Thermal energy storage · CPC title