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A kind of inorganic phase change energy storage material and preparation method thereof

An energy storage material and inorganic phase change technology, applied in the field of phase change energy storage, can solve the problems of supercooling, phase separation and low heat conduction efficiency, achieve excellent heat conduction performance, ensure stability, and have a wide range of application prospects

Active Publication Date: 2019-05-17
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are also disadvantages: supercooling, phase separation, and relatively low heat transfer efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Weigh the energy storage matrix material (CaCl 2 ·6H 2 O) 95 parts, nucleating agent (SrCl 2 ·6H 2 O) 3.0 parts, heat and stir under sealed conditions (40-50°C) until completely melted;

[0027] 2) Add 1.0 parts of surfactant (sodium dodecylbenzene sulfonate, SDBS) to it after melting, and disperse ultrasonically for 30 minutes to form a stable emulsion;

[0028] 3) Add 1.0 parts of functional additive (oxidized expanded graphite produced by modified Hummer method, EGO) into the stable emulsion, and stir for 30 minutes to obtain an inorganic phase change energy storage material;

[0029] 4) The obtained phase change energy storage material is poured into a container for packaging test.

[0030] Test Results:

[0031] The supercooling degree is 0.6°C;

[0032] The thermal conductivity is 1.832W / m K;

[0033] The latent heat value of phase change is 174.51J / g.

Embodiment 2

[0035] 1) Weigh 94 parts of energy storage matrix material (eutectic salt of calcium chloride hexahydrate and magnesium chloride hexahydrate) and 3.5 parts of nucleating agent (strontium carbonate) in proportion, heat and stir under sealed conditions (40-50°C) , until completely melted;

[0036] 2) Add 1.5 parts of surfactant (hexadecyltrimethylammonium bromide) to it after melting, and ultrasonically disperse for 30 minutes to form a stable emulsion;

[0037] 3) Add 1.0 parts of functional additive (oxidized expanded graphite produced by modified Hummer method, EGO) into the stable emulsion, and stir for 30 minutes to obtain an inorganic phase change energy storage material;

[0038] 4) The obtained phase change energy storage material is poured into a container for packaging test.

[0039] Test Results:

[0040] The supercooling degree is 1.0°C;

[0041] The thermal conductivity is 2.017W / m K;

[0042] The latent heat value of phase change is 109.76J / g.

Embodiment 3

[0044] 1) Weigh 97 parts of energy storage matrix material (eutectic salt of calcium chloride hexahydrate and calcium nitrate tetrahydrate) and 2.0 parts of nucleating agent (borax) in proportion, heat and stir under sealed conditions (40-50°C) , until completely melted;

[0045] 2) Add 0.8 parts of surfactant (sodium dodecyl sulfonate) to it after melting, and ultrasonically disperse for 30 minutes to form a stable emulsion;

[0046] 3) Add 0.2 parts of functional additives (oxidized expanded graphite produced by ordinary oxidation method, EGO) into the stable emulsion, and stir for 30 minutes to obtain an inorganic phase change energy storage material;

[0047] 4) The obtained phase change energy storage material is poured into a container for packaging test.

[0048] Test Results:

[0049] The supercooling degree is 1.3°C;

[0050] The thermal conductivity is 0.743W / m K;

[0051] The latent heat value of phase change is 117.42J / g.

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PUM

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Abstract

The invention discloses an inorganic phase-change energy-storage material. The energy-storage material is prepared form 94-97 parts of energy-storage basis materials, 0.2-1.0 part of functional additive, 2.0-3.5 parts of nucleating agent and 0.8-1.5 parts of surfactant. The inorganic phase-change energy-storage material is stable in performance, low in price, rich in raw material, convenient to prepare, large in latent heat of phase change, nontoxic and high in heat conductivity, and the inorganic phase-change energy-storage material can be widely applied to multiple fields such as a solar low-temperature heat-storage system and a household daily heat preservation and household hot water storage system.

Description

technical field [0001] The invention belongs to the technical field of phase change energy storage, in particular, the invention relates to an inorganic phase change energy storage material and a preparation method thereof. Background technique [0002] In the field of phase change energy storage technology, phase change materials are the foundation. Therefore, it is first necessary to research and develop phase change materials with large latent heat of phase change, stable performance and high cost performance. There are many types of phase change materials. From the perspective of phase change methods, they can be divided into four categories: solid-solid, solid-liquid, liquid-gas and solid-gas phase change materials. Since solid-gas and liquid-gas phase change materials are The presence of a large amount of gas during the phase change process makes the volume of the material change greatly. Therefore, although they have a large latent heat of phase change, they are rarel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 李翔周园董欧阳任秀峰曾金波年洪恩申月海春喜孙艳霞张丽娟
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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