High-performance medium-temperature inorganic phase-change material and preparation method thereof

An inorganic phase change material, high-performance technology, applied in heat exchange materials, chemical instruments and methods, climate sustainability, etc., can solve the problems of unstable phase separation, difficult long-term use, etc., and achieve simple and easy preparation methods Good encapsulation and recyclability

Inactive Publication Date: 2012-02-15
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In practical applications, some inorganic phase change materials disclosed in the prior art in this temperature range are prone to phase separation after repeated heat absorption and heat release, resulting in instability, and are not easy to use for a long time

Method used

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  • High-performance medium-temperature inorganic phase-change material and preparation method thereof
  • High-performance medium-temperature inorganic phase-change material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0020] A high-performance medium-temperature inorganic phase change material, the raw materials and mass percentages are:

[0021] Magnesium nitrate hexahydrate (Mg(NO 3 ) 2 ·6H 2 O) 86%

[0022] Lithium nitrate (LiNO) 3 ) 14%.

[0023] The preparation method is as follows: according to the above mass ratio, the crystal of magnesium nitrate hexahydrate and lithium nitrate are uniformly mixed to obtain a heat storage system, and the above heat storage system is placed in a glass test tube with a diameter of 30 mm, melted in a 90 ℃ water bath, and the sample is completely melted. Then keep the temperature for more than 10min to make the sample mix more evenly, and finally pour the mixture into a container for packaging.

[0024] The following matters should be paid attention to in the production process:

[0025] 1. The packaging container can be made of plastic or metal, and the shape can be spherical, rectangular, cubic or cylindrical, but no matter which packaging metho...

Embodiment 2

[0029] A high-performance medium-temperature inorganic phase change material, the raw materials and mass percentages are:

[0030] Magnesium nitrate hexahydrate (Mg(NO 3 ) 2 ·6H 2 O) 90%;

[0031] Lithium nitrate (LiNO) 3 ) 10%.

[0032] The preparation method is as follows: uniformly mixing magnesium nitrate hexahydrate crystals and lithium nitrate according to the above mass ratio to obtain a heat storage system, placing the above heat storage system in a glass test tube with a diameter of 30 mm, and heating it in a 90°C water bath until the sample is melted. , the sample is completely melted and then kept for more than 10 minutes to make the sample mix more evenly, and finally the mixture is poured into a container for packaging.

[0033] The following matters should be paid attention to in the production process:

[0034] 1. The packaging container can be made of plastic or metal, and the shape can be spherical, rectangular, cubic or cylindrical, but no matter which ...

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Abstract

The invention relates to a high-performance medium-temperature inorganic phase-change material and a preparation method thereof. The materials of the inorganic phase-change material and the weight percentage ranges of the materials are as follows: 86 to 90 percent of magnesium nitrate hexahydrate; and 10 to 14 percent of lithium nitrate. The preparation method includes the following steps: the magnesium nitrate hexahydrate and the lithium nitrate are uniformly mixed according to the weight percentage, are completely melted under the temperature of 90 DEG C and are packaged, and thereby the finished inorganic phase-change material produce is prepared. The materials of the medium-temperature phase-change energy-storing material provided by the invention are abundant, the price is low, the medium-temperature phase-change energy-storing material is nontoxic and noncorrosive, the preparation method is simple, the latent heat of phase change is high, the phase change temperature is between 62 DEG C and 73 DEG C, the performance is excellent, repetitive experiments prove that the performance of the inorganic phase-change material is stable, and the inorganic phase-change material does not have the phenomena of undercooling or phase separation, and can be widely popularized and applied in fields such as electric heating elements, heat storage and temperature regulation of water heaters, daily energy-saving products and the like.

Description

technical field [0001] The invention relates to a composite phase-change energy storage material, which is applied to electric heating elements, water heater heat storage and temperature adjustment and daily energy-saving products, in particular to a high-performance medium-temperature inorganic phase-change material and a preparation method thereof. Background technique [0002] The phase change energy storage technology uses the characteristics of substances to absorb or release energy during the constant temperature phase change process, and store the temporarily unused energy, and then use it when needed, thus solving the problem of heating and heat consumption due to time or place. The problem of low energy utilization rate caused by mismatch and unevenness, in order to maximize the thermal efficiency of the entire heating system, has shown a very wide range of and important applications in the fields of energy, aerospace, military, agriculture, construction, chemical in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCY02P20/10
Inventor 邓天龙闫东军郭亚飞王士强高道林李玉婷
Owner TIANJIN UNIV OF SCI & TECH
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