Claims
- 1. A heat storage material consisting essentially of pure or industrial grade acetic acid or a mixture of pure or industrial grade acetic acid and one or more acetates, and at least one anhydrous halide of a substance selected from the group consisting of calcium, strontium, barium, potassium and ammonium as a nucleating agent; the amount of the anhydrous halide in the heat storage material being 0.005 to 10% by weight.
- 2. A heat storage material according to claim 1, wherein the anhydrous halide is a chloride of calcium, strontium, barium, potassium or ammonium.
- 3. A heat storage material according to claim 1, wherein the anhydrous halide is a bromide of calcium, strontium, barium, potassium or ammonium.
- 4. A heat storage material comprising acetic acid or a mixture of acetic acid and one or more acetates, and at least one anhydrous iodide of calcium, strontium or barium.
- 5. A heat storage material comprising pure or industrial grade acetic acid or a mixture of pure or industrial grade acetic acid and one or more acetates, and two or more anhydrous halides of the substances selected from the group consisting of calcium strontium, barium, potassium and ammonium.
- 6. A heat storage material according to claim 5, wherein the anhydrous halides are chlorides of calcium, strontium, barium, potassium and/or ammonium.
- 7. A heat storage material according to claim 5, wherein the anhydrous halides are bromides of calcium, strontium, barium, potassium and/or ammonium.
- 8. A heat storage material according to claim 5, wherein the anydrous halides are iodides of calcium, strontium and/or barium.
- 9. A heat storage material according to claim 5, wherein the amount of the anhydrous halides added in the heat storage material is 0.005 to 10% by weight.
- 10. A heat storage material according to claim 1, wherein said mixture of pure or industrial grade acetic acid and one or more acetates is composed predominantly of pure or industrial grade acetic acid.
- 11. A heat storage material comprising pure or industrial grade acetic acid or a mixture of pure or industrial grade acetic acid and one or more acetates, and at least one anhydrous halide of a substance selected from the group consisting of calcium, strontium and barium, or at least one anhydrous chloride or bromide of ammonium, or mixtures thereof; the amount of the anhydrous halide in the heat storage material being 0.005 to 10% by weight.
Priority Claims (2)
| Number |
Date |
Country |
Kind |
| 57-62406 |
Apr 1982 |
JPX |
|
| 57-203614 |
Nov 1982 |
JPX |
|
Parent Case Info
This invention relates to a heat storage material to be used for air cooling systems.
It is known that pure acetic acid solidifies or melts at 16.7.degree. C. and in the case of acetic acid containing impurities, such as industrial grade acetic acid, its solidification or melting occurs at a fixed temperature above 14.5.degree. C., which simultaneously causes release or absorption of latent heat, so that acetic acid is useful as a heat storage material. Acetic acid, however, has a disadvantageous property in that when placed in a sealed container it is subject to supercooling of an extent of 6.degree.-10.degree. C. with the result that its heat accumulation or release fails to take place at a fixed temperature. The cause of this phenomenon is not yet definitely known, but it is considered that this is due to the following reason: in case acetic acid is placed in an open container, evaporation of acetic acid takes place for the surface thereof, and as its evaporation heat is taken away, acetic acid separates out as crystals which serve as a nucleus for urging the progress of solidification.
A composition comprising acetic acid and an acetate dissolved therein also undergoes supercooling of 6.degree. to 10.degree. C. when placed in a closed state although no such supercooling occurrs in an open state as in the case of acetic acid, and hence these compositions, too, would fail to perform its heat accumulation or release at a fixed temperature when kept in a closed state.
An object of this invention is to prevent supercooling of acetic acid or composite materials of acetic acid and an acetate and to provide a heat storage material which is capable of smoothly effecting heat accumulation or heat release at a fixed temperature which is determined by the composition of the material.
The heat storage material according to this invention comprises acetic acid or a mixture of acetic acid and one or more acetates, and at least one substance selected from anhydrous halides of calcium, strontium, barium, potassium and ammonium as a nucleating agent.
US Referenced Citations (1)
| Number |
Name |
Date |
Kind |
|
4412930 |
Koike et al. |
Nov 1983 |
|
Foreign Referenced Citations (3)
| Number |
Date |
Country |
| 53-14173 |
Feb 1978 |
JPX |
| 57-102982 |
Jun 1982 |
JPX |
| 149380 |
Sep 1982 |
JPX |
Patent Grant
4518514
