JPS5874777A - Heat-accumulating material composition - Google Patents

Abstract

PURPOSE:To provide a heat-accumulating material compsn. which enables an effective heat accumulation-heat dissipation cycle while inhibiting a supercooling phenomenon and is used for heating systems utilizing solar heat, by blending an iron salt with sodium acetate trihydrate. CONSTITUTION:An iron salt, pref. ferric acetate, ferrous chloride or ferric chloride is blended with sodium acetate trihydrate to obtain the titled heat accumulating material compsn. Said iron salt is used in an amount of 0.1-5,000ppm, pref. 10-1,500ppm based on the total amount of the compsn. Other heat accumulating material and a heat accumulating aid such as a gelling agent may be used together with the above components.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention utilizes the 1:1:ability CJL quality of #acid sodium hexahydrate to be used as a heat storage material for a single-use device using fat@elk.

One point of Sodium Hexahydrate is 58C, M antipyretic has a unit weight of 1 60ml, and 987 pieces per unit volume are C and W5.
70% as a heat storage material that has 4FI properties and utilizes solar heat.
A chemical book that is expected to be put to practical use.

However, the sls#i heat has the disadvantage that it is easy to cause a supercooling phenomenon due to heat radiation, and solidification does not start at the desired temperature, making it difficult to efficiently radiate heat.

Such supercooling weight gain can be said to be a fatal flaw in heat storage materials that contain not only sodium acetate hexahydrate but also inorganic hydrated salts and organic hydrated salts, and is the biggest reason for preventing their practical application. Therefore, a number of solutions have been reported in the past, including attempts to stop supercooling rFi by adding various types of nucleation aids.
The effects are not necessarily sufficient, and countermeasures are required.

However, the present invention number Fi# supercooling of filtrated sodium salt
JI41 E-Storing Insects - Heat Dissipation Nycle [After repeated research on nucleation aid MK for efficient nucleation6, we discovered that iron salts can exhibit a remarkable effect on preventing supercooling [J1i1] and developed the present invention. It's big enough to do.

The molten sodium acetate hexahydrate in the storage room gradually cools down by releasing latent heat (of course, this heat release is also used for the ll1iI chamber). On paper, crystals of sodium acetate hexahydrate begin to precipitate, and heat radiation should continue for a long time due to the generation of heat, but in Tonto, crystals do not precipitate even if the temperature is below the freezing point.
In the present invention, by coexisting iron salt, it acts as a nucleation aid, and sodium acetate trihydrate has a temperature near the freezing point. Precise precipitation of crystals occurs and supercooling is prevented, and the action of the iron salt as a nucleation aid is exerted even after long-term heat storage and cycling. 41I is highly usable in terms of its life.

Compounds m&i that are effective as superimposed &jIO iron salts are ferric acetate, ferrous chloride, and ferric chloride. Other iron salts include ferric citrate, ferrous iron, phosphorus a-ferrous,
Examples include ferric perchlorate and ferric nitrate.

Iron salt has a composition of 0.1 to 5 (1000pp) relative to the amount of gold.
m is preferably blended at 10 (500 ppmO).

If the content is 0.1 ppm or more, the cooling effect will be poor, while if the content is 50,000 ppm or more, the latent heat will tend to decrease, which is disadvantageous.

The composition of the present invention @Ktj may be used in combination with any other heat storage aids, such as gelation.

The heat storage material composition thus obtained is suitable for use in solar systems that utilize solar heat, and is capable of producing stable heat storage over a long period of time.

Next, the 4faM combination of the present invention will be explained in more detail by giving an example.

Cap 1 Sodium acetate hexahydrate 50. Of and ferric acetate 0.5g
Mixed, heated to 80 cK and kept for 2 hours. (The obtained 0 was then allowed to cool, supercooling was destroyed in a zeta filter 54t and acid was added) 99A5 water salt OM ink began to precipitate) Liquid temperature is 580
It rose in the housing and lasted 58 Ci until the latent heat was discharged from the armpit. You can get the same wish even if you continue Heat Nicle for 60 or more.

Real N2 payi! The same experiment as in Example #111 was conducted except that ferrous chloride was used in place of ferric II.

Destruction due to supercooling was observed at 50 ml.

Example 3 Perform the same experiment as Example 1 except for using ferric chloride instead of ferric acetate★.

51, destruction due to supercooling was observed.

Example 4 Sodium acetate filtrate 50. Of%#ferric acid 0.00
Atarylamide/acrylic acid copolymer was added to the composition consisting of 521 and heated at 800C to form a gel-like composition.

When the scissor composition was left to cool, supercooling occurred and crystals began to precipitate after 56 minutes. A % identical pot was obtained by repeating the heat vehicle over 50 times.

Claims (1)

[Claims] 1. A heat storage material composition comprising sodium 611 hexahydrate and iron salt. 2. The carpet composition of claim 1, wherein the iron salt is iron acetate. 3. The composition of the patented il@-1999 patent, wherein the iron salt is iron chloride.