Heat-storage medium and its use

A heat storage medium and application technology, applied in the direction of heat exchange materials, building components, heat preservation, etc., to achieve the effect of low toxicity and no supercooling performance

Inactive Publication Date: 2007-04-04
HUNAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Saline compounds consisting of magnesium chloride, magnesium nitrate and water with a eutectic melting temperature different from the above have not been reported.

Method used

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  • Heat-storage medium and its use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Mix 78 kg of magnesium nitrate hexahydrate and 22 kg of magnesium chloride hexahydrate together, then heat the solution to evaporate about 10 kg of water, and the resulting solution will condense into a brine compound (magnesium nitrate hexahydrate, hexahydrate, A mixture of magnesium chloride hydrate and magnesium nitrate dihydrate), the melting point of which is 40±1.5°C.

Embodiment 2

[0024] Take a certain amount of the mixture prepared by the method described in Example 1 and put it into a certain airtight container, heat it from room temperature (25° C.) to 45° C., and the stored sensible heat is equivalent to 300% of the stored heat of pure water of the same weight; When heated from room temperature (25°C) to 70°C, the stored heat is equivalent to 200% of the same weight of pure water. At room temperature, the time required to cool a certain weight of the energy storage mixture at a temperature of 70° C. to room temperature is more than 2.5 times the time required to cool the same weight of the same pure water. If the heat storage medium is used to replace the water in a common household hot water bag, the cooling time of the hot water bag can be more than doubled, and its temperature is kept between 39°C and 41°C most of the time, making the body feel very comfortable.

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PUM

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Abstract

A heat-retaining medium and its use are disclosed. The medium consists of magnesium chloride 10-13wt%, magnesium nitrate 48-53wt% and H2O 36-40wt%. It can be used to thermal-insulating layer on top of building and household energy-storing heater.

Description

technical field [0001] The invention relates to a phase change material that stores heat energy in a phase change form, and in particular to a preparation method of a heat storage medium and its application. Background technique [0002] The phase change heat storage medium automatically absorbs a large amount of heat from the environment by melting itself in an environment higher than its unique phase change melting temperature, and releases heat to the environment by automatically condensing in an environment lower than its unique phase change temperature , so as to maintain the constant temperature of the environment and achieve the purpose of energy storage. [0003] Substances used as phase-change heat storage media may be anhydrous salts, salt water compounds and their mixtures, organic substances, and the like. Among them, organic substances are likely to cause fire hazards when they are applied; anhydrous salts or their mixtures are suitable for high-temperature hea...

Claims

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Application Information

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IPC IPC(8): C09K5/02E04B1/76
Inventor 曾德文林大泽张永德李碧海周红艳
Owner HUNAN UNIV
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