Heat storage material composition and method for using heat storage material composition

Patent metadata

Field	Value
Publication number	US-9732264-B2
Application number	US-201414496235-A
Country	US
Kind code	B2
Filing date	Sep 25, 2014
Priority date	Sep 30, 2013
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

A heat storage material composition contains sodium acetate, water, and an organic compound comprising a hydrophobic group and a hydrophilic group. A weight ratio R (sodium acetate/water) of the sodium acetate to the water is 57/43 or less. A concentration Ws of the sodium acetate in three components of the sodium acetate, the water, and the organic compound comprising a hydrophobic group and a hydrophilic group is 52% by weight or more. A concentration Wa of the organic compound comprising a hydrophobic group and a hydrophilic group in the three components is 1% by weight or more.

First claim

What is claimed is:

1. A heat storage material composition comprising:
sodium acetate;
water; and
an organic compound comprising a hydrophobic group and a hydrophilic group that is selected from the group consisting of methanol, ethanol, 1-propanol, 2-propanol, n-butyl alcohol, and tert-butyl alcohol,
wherein a concentration Ws is a concentration of the sodium acetate,
wherein a concentration Wa is a concentration of the organic compound comprising a hydrophobic group and a hydrophilic group,
wherein a concentration Ww is a concentration of the water,
wherein, when the organic compound is methanol, the heat storage material composition has a weight ratio R of the sodium acetate to the water is 55/45 or more and 57/43 or less, the concentration Ws is 52% by weight or more, and the concentration Wa is 1% by weight or more,
wherein, when the organic compound is ethanol, the heat storage material composition is derivable from a triangular diagram that shows a composition of the sodium acetate, the water, and the ethanol in units of weight percent, the heat storage material composition being defined by a region surrounded by lines connecting three points, where
a first of the three points indicating that the concentration Ws of the sodium acetate is 53 wt %, the concentration Ww of the water is 40 wt %, and the concentration Wa of the ethanol is 7 wt %,
a second of the three points indicating that the concentration Ws of the sodium acetate is 52 wt %, the concentration Ww of the water is 39 wt %, and the concentration Wa of the ethanol is 9 wt %, and
a third of the three points indicating that the concentration Ws of the sodium acetate is 52 wt %, the concentration Ww of the water is 42 wt %, and the concentration Wa of the ethanol is 6 wt %, and

wherein, when the organic compound is 1-propanol, the heat storage material composition has a weight ratio R of the sodium acetate to the water is 57/43 or less, the concentration Ws is 52% by weight or more, and the concentration Wa of the 1-propanol is 1% by weight or more,
wherein, when the organic compound is 2-propanol, the heat storage material composition has a weight ratio R of the sodium acetate to the water is 55/45 or less, the concentration Ws is 52% by weight or more, and the concentration Wa of the 2-propanol is 2% by weight or more,
wherein, when the organic compound is n-butyl alcohol, in a triangular diagram that shows a composition of the sodium acetate, the water, and the n-butyl alcohol in units of weight percent, the concentration Wa of the n-butyl alcohol is equal to or more than a concentration represented by a straight line connecting a first point A and a second point B, where
the first point A indicating that the concentration Ws of the sodium acetate is 52 wt %, the concentration Ww of the water is 47 wt %, and the concentration Wa of the n-butyl alcohol is 1 wt %,
the second point B indicating that the concentration Ws of the sodium acetate is 56 wt %, the concentration Ww of the water is 42 wt %, and the concentration Wa of the n-butyl alcohol is 2 wt %,

the concentration Ws is 52% by weight or more, and
the weight ratio R of the sodium acetate to the water is 57/43 or less, and
wherein, when the organic compound is tert-butyl alcohol, the heat storage material composition has a weight ratio R of the sodium acetate to the water is 55/45 or more and 57/43 or less, the concentration Ws is 52% by weight or more, and the concentration Wa of the tert-butyl alcohol is 2% by weight or more.

2. A method comprising the steps of:
(a) heating the heat storage material composition of claim 1 in a first state, the heat storage material composition containing sodium acetate trihydrate in a solid phase and being contained in a heat storage material container, to a first temperature equal to or higher than a phase-change temperature of the sodium acetate trihydrate by allowing a heat medium to flow such that heat exchange is performed between the heat medium and the heat storage material container to thereby melt the sodium acetate trihydrate and change the state of the heat storage material composition to a second state;
(b) preserving the heat storage material composition in the second state in the heat storage material container at a second temperature lower than the phase-change temperature of the sodium acetate trihydrate;
(c) coagulating the sodium acetate trihydrate in the heat storage material container to thereby change the state of the preserved heat storage material composition in the second state to the first state; and
(d) recovering at least part of heat released from the heat storage material composition by coagulation of the sodium acetate trihydrate by allowing a heat medium to flow such that heat exchange is performed between the heat medium and the heat storage material container.

Assignees

• Panasonic Corp

Inventors

• Suzuki Motohiro
• Hirasawa Izumi

Classifications

• F28D20/0056

  using solid heat storage material (F28D20/0052 takes precedence) · CPC title

• C09K5/20

  Antifreeze additives therefor, e.g. for radiator liquids (for application to surfaces C09K3/18; inhibiting corrosion by liquids C23F11/00) · CPC title

• C09K5/063

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

• C09K5/066

  Cooling mixtures; De-icing compositions · CPC title

• C09K5/10 Primary

  Liquid materials · CPC title