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Phase change energy storage material for heat preservation at night and preparation method

A technology of phase-change energy storage materials and nucleating agents, which is applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of high melting temperature of phase-change materials, inability to melt, and narrow solidification temperature range of phase-change materials. Achieve the effects of wide adjustable range, improved stability, and low melting temperature

Inactive Publication Date: 2013-07-17
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

[0004] Existing room temperature phase change energy storage materials cannot meet the following application requirements:
[0005] (1) The melting temperature of the phase change material is too high, and generally cannot be melted at a lower temperature (about 20°C);
[0006] (2) The solidification temperature range of phase change materials is too narrow to crystallize and solidify at nighttime temperatures in different seasons or regions;
[0007] (3) The melting temperature and solidification temperature of the phase-change energy storage materials reported in the above patents are very close, which cannot achieve the effect of high-temperature energy storage and low-temperature heat release, so it is difficult to be practically applied;
[0008] ⑷ The common phase separation and supercooling phenomena of inorganic phase change energy storage materials cannot be effectively solved

Method used

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  • Phase change energy storage material for heat preservation at night and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 A phase change energy storage material that can be used for night heat preservation, the medium is composed of CaCl 2 -MgCl 2 -H 2 O water salt system and 1.0g nucleating agent borax.

[0031] Among them: CaCl 2 -MgCl 2 -H 2 The O water salt system consists of 95.0g calcium chloride hexahydrate, 1.3g magnesium chloride hexahydrate, and 3.7g deionized water.

[0032] The preparation method of the phase change energy storage material comprises the following steps:

[0033] (1) Weigh each raw material according to the ratio;

[0034] (2) Heating the recrystallized and purified calcium chloride hexahydrate in a constant temperature water bath at 40-50°C until completely melted to obtain a calcium chloride hexahydrate solution;

[0035] (3) Put the calcium chloride hexahydrate solution into a container, add magnesium chloride hexahydrate and deionized water under the condition of magnetic stirring with a rotating speed of 500~800r / min, and heat during th...

Embodiment 2

[0039] Example 2 A phase change energy storage material that can be used for night heat preservation, the medium is composed of CaCl 2 -MgCl 2 -H 2 O water salt system and 1.0g nucleating agent borax.

[0040] Among them: CaCl 2 -MgCl 2 -H 2 The O water salt system consists of 92.2g calcium chloride hexahydrate, 2.3g magnesium chloride hexahydrate, and 5.5g deionized water.

[0041] The preparation method of the phase change energy storage material is the same as Example 1 .

[0042] The obtained phase change material was tested by T-history method, and its melting temperature was 23.5-24.5°C, and its solidification temperature was 17.3°C.

Embodiment 3

[0043] Example 3 A phase change energy storage material that can be used for night heat preservation, the medium is composed of CaCl 2 -MgCl 2 -H 2 O water salt system and 1.0g nucleating agent strontium chloride hexahydrate composed.

[0044] Among them: CaCl 2 -MgCl 2 -H 2 The O water salt system consists of 90.7g calcium chloride hexahydrate, 2.8g magnesium chloride hexahydrate, and 6.5g deionized water.

[0045] The preparation method of the phase change energy storage material is the same as Example 1 .

[0046] The obtained phase change material was tested by T-history method, and its melting temperature was 23.0-23.5°C, and its solidification temperature was 14.4°C.

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Abstract

The invention relates to a phase change energy storage material for heat preservation at night. The medium consists of a CaC12-MgCl2-H2O water salt system and a nucleating agent; the CaC12-MgCl2-H2O water salt system consists of 80-95 % of calcium chloride hexahydrate, 1-7 % of magnesium chloride hexahydrate and 3-15 % of deionized water by mass; and the content of the nucleating agent is 0.5-2.0 % of the total amount of the CaC12-MgCl2-H2O water salt system. The phase change energy storage material has the advantages of high phase change latent heat, relatively low melting temperature and adjustable solidification temperature, can be used for avoiding the phase separation phenomenon, and can be applied to different seasons and different regions.

Description

technical field [0001] The invention relates to a phase-change energy storage material and a preparation method, in particular to a phase-change energy storage material and a preparation method that can be used for night heat preservation. Background technique [0002] At present, a major problem encountered in the development and utilization of clean energy such as solar energy is the storage of energy. A high-efficiency energy storage material can solve this problem to a certain extent, and energy storage materials are used in the "power supply system" It has broad application prospects in fields such as "moving peaks and filling valleys", recycling industrial waste heat and energy-saving materials for civil buildings. The phase change temperature of low-temperature phase change materials is close to room temperature, and has broad application prospects in the fields of building materials, heating equipment, and agricultural greenhouses. At present, there are not many type...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 赵有璟时历杰王敏张大义康为清
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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