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Preparation method of hydrated salt-porous wood compound phase change energy storage materials

A technology of composite phase change and energy storage materials, applied in the field of preparation of hydrated salt-porous wood composite phase change energy storage materials, can solve the problem of poor stability of composite phase change materials, poor stability of composite phase change materials, and porous carbonized wood machinery. Low strength and other problems, to achieve the effects of good wetting performance, good phase transition stability, high encapsulation capacity and heat storage capacity

Inactive Publication Date: 2019-07-26
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires carbonization under a high-temperature inert atmosphere, and the preparation process is complicated
The mechanical strength of the prepared porous carbonized wood is low, and the stability of the composite phase change material prepared due to easy leakage after encapsulation of lauric acid is poor, and the wettability of lauric acid and porous carbonized wood is poor, which is closely related to the poor stability of the composite phase change material. relevant
[0007] Although the composite phase change energy storage materials made of hydrated salts and porous carbon, sepiolite, expanded graphite and other substrates in the above literatures exhibit excellent thermal properties, they also have poor stability, low heat storage capacity, complex preparation process and cost. High disadvantage

Method used

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  • Preparation method of hydrated salt-porous wood compound phase change energy storage materials

Examples

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Effect test

Embodiment 1

[0029] Example 1 A method for preparing a hydrated salt-porous wood composite phase change energy storage material. The method refers to first delignifying Pine sylvestris sylvestris logs by alkali solution reaction, and then freeze-drying them at -20°C for 12 hours to obtain porous Wood base material. Heat and melt the hydrated salt Na at 50~60 ℃ 2 SO 4 10H 2 O and the porous wood matrix material are placed in a vacuum device, and vacuumized, and the hydrated salt is encapsulated by vacuum impregnation to obtain the hydrated salt-porous wood composite phase change energy storage material.

[0030] After DSC analysis of the energy storage material, the latent heat of phase change in the melting process of the packaged composite phase change energy storage material is 150.8 J / g, and the phase change latent heat in the solidification process is 120.3 J / g (see figure 2 ).

[0031] Among them: delignification treatment refers to adding NaOH and NaOH to 70 times its mass 2 SO ...

Embodiment 2

[0033] Example 2 A preparation method of a hydrated salt-porous wood composite phase change energy storage material, the method refers to the process of delignification of sycamore logs by alkali solution reaction, and then freeze-drying at -30 ℃ for 18 hours to obtain porous wood Matrix material. Heat and melt the hydrated salt Na at 50~60 ℃ 2 CO 3 10H 2 O and the porous wood matrix material are placed in a vacuum device, and vacuumized, and the hydrated salt is encapsulated by vacuum impregnation to obtain the hydrated salt-porous wood composite phase change energy storage material.

[0034] After DSC analysis of the energy storage material, the latent heat of phase change in the melting process of the packaged composite phase change energy storage material is 114.7 J / g, and the phase change latent heat in the solidification process is 95.9 J / g (see image 3 ).

[0035] Among them: delignification treatment refers to adding sycamore wood logs to 73 times its mass of NaOH...

Embodiment 3

[0037] Example 3 A method for preparing a hydrated salt-porous wood composite phase change energy storage material. The method refers to first delignifying basswood logs by alkali solution reaction, and then freeze-drying at -40°C for 24 hours to obtain porous wood Matrix material. Heat and melt the hydrated salt CH at 70~80 ℃ 3 COONa·3H 2 O and the porous wood matrix material are placed in a vacuum device, and vacuumized, and the hydrated salt is encapsulated by vacuum impregnation to obtain the hydrated salt-porous wood composite phase change energy storage material.

[0038] After DSC analysis of the energy storage material, the latent heat of phase change in the melting process of the packaged composite phase change energy storage material is 192.7 J / g, and the phase change latent heat in the solidification process is 164.9 J / g (see Figure 4 ).

[0039] Among them: delignification treatment refers to adding basswood logs to 75 times its mass of NaOH and Na 2 SO 3 Pla...

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Abstract

The invention relates to a preparation method of hydrated salt-porous wood compound phase change energy storage materials. According to the method, delignification treatment of a log is implemented byalkali dissolution reaction, freeze drying of the log is implemented to obtain a porous wood base material, hydrated salt is sealed in the porous wood base material by a vacuum impregnation method toobtain the hydrated salt-porous wood compound phase change energy storage materials. The preparation method is simple and low in cost, and the acquired energy storage materials have excellent morphological stability and higher sealing amount and heat storage capacity and are applicable to the fields of furniture, decoration industry, building intelligent temperature control and the like.

Description

technical field [0001] The invention relates to the field of heat transfer, heat exchange or heat storage materials, in particular to a preparation method of a hydrated salt-porous wood composite phase change energy storage material. Background technique [0002] Salt hydrate is a common inorganic phase-change energy storage material. It has the advantages of high heat storage density, wide phase-change temperature range, and large latent heat. However, there is a problem of poor phase-change stability during application, and it needs to be packaged and shaped. Hydrated salts are easy to be encapsulated and confined in the pores of porous media by capillary action and surface tension, so as to maintain good stability, so they have attracted much attention. [0003] Publication number CN108676550A discloses an inorganic hydrated salt porous carbon composite phase change material and its preparation method. It first prepares activated biomass-based porous carbon, and weighs th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 李金洪杨志伟邓勇
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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