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Composite phase change material

A technology of composite phase-change materials and heat-conducting materials, which is applied in the field of composite phase-change materials, can solve problems such as serious phase separation, and achieve the effects of improving heat exchange efficiency, long service life, and low degree of supercooling

Active Publication Date: 2020-03-13
SHAANXI NORTHWEST POWER GENERATION ENG
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Problems solved by technology

[0005] In the above prior art, the inorganic eutectic in the phase change material will gradually separate out with the increase of the number of cycles, and there will be a serious problem of phase separation.

Method used

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preparation example Construction

[0029] The preparation equipment involved in this embodiment includes a reactor with stirring and heating.

[0030] The preparation method of the composite phase change material comprises:

[0031] Step a1: 25g of calcium chloride hexahydrate is added to the reactor,

[0032] Step a2: stirring at a heating temperature of 50°C until the calcium chloride hexahydrate completely becomes liquid and homogeneous;

[0033] Step a3: add 56g of hexanediol;

[0034] Step a4: stirring until the system becomes homogeneous;

[0035] Step a5: adding 20g of expanded graphite;

[0036] Step a6: keep constant temperature and stir.

[0037] In this embodiment, a uniform composite phase change material can be produced through the above-mentioned preparation method. An example of the temperature change difference of the composite phase change material may be 13.4°C.

[0038] Such as figure 1 As shown, after 1000 cycles of the obtained composite phase change material, there is no phase separ...

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Abstract

The embodiments of the invention provide a composite phase change material, which comprises, by mass, 20-50% of calcium chloride hexahydrate, 30-70% of hexanediol and 8-25% of a heat conduction material. According to the composite phase change material provided by the embodiment of the invention, no phase separation phenomenon can be ensured without adding of a thickening agent, the technical effect of low supercooling degree can be achieved without adding of a nucleating agent, supercooling is basically avoided, and the heat exchange efficiency between the system applied by the composite phase change material and the outside can be improved by adding the heat conduction material; and the composite phase change material provided by the embodiment of the invention is long in service life, can be applied to cold accumulation, and particularly can be used as a cold accumulation medium of 10-20 DEG C, for example, the composite phase change material can be used for off-peak electricity cold accumulation, food preservation and the like.

Description

technical field [0001] The invention relates to the technical field of cold storage, in particular to a composite phase change material. Background technique [0002] The sustainable development of the environment is the primary basis for people to pursue a high-quality life. To solve the sustainable development of the environment, we can start from two aspects. One is to reduce energy consumption or improve the efficiency of energy use; the other is to develop and use new energy sources. Such as solar energy, wind energy, etc. In the current social development, the use of cooling capacity has been widely used in summer building cooling, food preservation, vaccine transportation and other fields, especially in summer building cooling mostly adopts air conditioners. This has caused the widening of the peak-to-valley difference of the power grid. There are also a small number of buildings that use ice storage for cooling, using off-peak electricity at night to store cold, an...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/066Y02E60/14
Inventor 李智威杜晓蒋镇兵
Owner SHAANXI NORTHWEST POWER GENERATION ENG
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