Heat storage device

Patent metadata

Field	Value
Publication number	US-2020063012-A1
Application number	US-201916667946-A
Country	US
Kind code	A1
Filing date	Oct 30, 2019
Priority date	Jun 29, 2017
Publication date	Feb 27, 2020
Grant date	—

Abstract

Provided is a heat storage device ( 10 ) of the present disclosure comprises a heat storage material ( 12 ) containing sodium acetate trihydrate; a first electrode having a surface which is in contact with the heat storage material and formed of at least one selected from the group consisting of silver, a silver alloy, and a silver compound; a second electrode in contact with the heat storage material; an inorganic porous material contained in the heat storage material; and a power supply ( 14 ) for applying a voltage to the first electrode and the second electrode. The inorganic porous material has an average pore diameter of not more than 50 nanometers. The present invention provides a heat storage device capable of releasing heat by releasing a supercooled state by voltage application. The heat storage device can be used repeatedly.

First claim

1 . A method for releasing heat, the method comprising:
(pa1) crystallizing a heat storage material containing sodium acetate trihydrate; (pa2) melting the heat storage material at a temperature of not more than 80 degrees Celsius after the step (pa1); (a) cooling the heat storage device comprising the heat storage material to bring the sodium acetate trihydrate into a supercooled state; wherein the heat storage device comprises:
a first electrode having a surface which is in contact with the heat storage material, wherein the surface is formed of at least one selected from the group consisting of silver, a silver alloy, and a silver compound;
a second electrode in contact with the heat storage material;
an inorganic porous material contained in the heat storage material; and
a power supply for applying a voltage to the first electrode and the second electrode; and
the inorganic porous material has an average pore diameter of not less than 10 nanometers and not more than 50 nanometers; and the inorganic porous material is formed of silica gel; (b) applying a voltage to the first electrode and the second electrode with the power supply at a temperature of not more than 58 degrees Celsius after the step (a) to release the heat from the heat storage material; and (c) heating the heat storage device at a temperature of not less than 58 degrees Celsius and not more than 80 degrees Celsius to melt the sodium acetate trihydrate after the step (b).

2 . The method according to claim 1 , wherein
the step (pa1) comprises: (pa11) cooling the heat storage material to a temperature of not more than minus 30 degrees Celsius.

3 . The method according to claim 1 , wherein
the step (pa1) comprises: (pa12) adding a crystal of sodium acetate trihydrate to the heat storage material in the supercooled state.

4 . A method for applying heat to an engine included in a vehicle, the method comprising:
(pa1) crystallizing a heat storage material containing sodium acetate trihydrate; (pa2) melting the heat storage material at a temperature of not more than 80 degrees Celsius after the step (pa1); (a) cooling the heat storage device comprising a heat storage material to bring the sodium acetate trihydrate into a supercooled state; wherein the heat storage device is included in the vehicle; the heat storage device comprises:
a first electrode having a surface which is in contact with the heat storage material; the surface being formed of at least one selected from the group consisting of silver, a silver alloy, and a silver compound;
a second electrode in contact with the heat storage material;
an inorganic porous material contained in the heat storage material; and
a power supply for applying a voltage to the first electrode and the second electrode; and
the inorganic porous material has an average pore diameter of not less than 10 nanometers and not more than 50 nanometers; and the inorganic porous material is formed of silica gel; (b) applying a voltage to the first electrode and the second electrode with the power supply at a temperature of not more than 58 degrees Celsius to apply the heat to the engine due to release of the heat from the heat storage material; (c) heating the heat storage device at a temperature of not less than 58 degrees Celsius and not more than 80 degrees Celsius to melt the sodium acetate trihydrate after the step (b).

5 . The method according to claim 4 , wherein
the step (pa1) comprises: (pa11) cooling the heat storage material to a temperature of not more than minus 30 degrees Celsius.

6 . The method according to claim 4 , wherein
the step (pa1) comprises: (pa12) adding a crystal of sodium acetate trihydrate to the heat storage material in the supercooled state.

Assignees

• Panasonic Corp

Inventors

• Kubo Takashi
• Suzuki Motohiro
• Machida Hironobu
• Takeguchi Shinsuke
• Shii Kentaro
• Tani Naoyuki
• Nakamura Tatsuya

Classifications

• F28D20/028

  Control arrangements therefor · CPC title

• F28D20/023

  the latent heat storage material being enclosed in granular particles or dispersed in a porous, fibrous or cellular structure · CPC title

• C09K5/063 Primary

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

• F01P3/20

  Cooling circuits not specific to a single part of engine or machine (F01P3/22 takes precedence) · CPC title

• C09K5/06

  the change of state being from liquid to solid or vice versa · CPC title