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Modified wood fibre phase change energy storage material and preparation method thereof

A phase change energy storage material and wood fiber technology are applied in the field of modified wood fiber phase change energy storage materials and their preparation, and can solve the problem of phase change material leakage, phase change enthalpy, low phase change latent heat and melting of phase change energy storage materials. Easy to leak, reduce service life and other problems, to achieve the effect of increasing porosity, preventing leakage and improving performance

Inactive Publication Date: 2018-02-27
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after 800 consecutive heat storage and release cycles, the decay rates of the phase change enthalpy of the two were as high as 26.0% and 9.9%, respectively, that is, after 800 cycles, the leakage of the phase change material caused the phase change enthalpy to decrease, reducing the its service life
[0009] Therefore, the defects of low phase change latent heat and easy leakage during melting of phase change energy storage materials in the prior art have become technical problems to be solved urgently.

Method used

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  • Modified wood fibre phase change energy storage material and preparation method thereof
  • Modified wood fibre phase change energy storage material and preparation method thereof
  • Modified wood fibre phase change energy storage material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0061] Embodiment 1 prepares double salt solution

[0062] Preparation of double salt solution I: Weigh 10g of sodium nitrate, 6g of sodium chloride, and 4g of sodium sulfate according to the mass ratio, put them into a beaker, pour 80mL of distilled water into it, and stir on a magnetic stirrer at 60°C until Dissolve completely and cool at room temperature to obtain double salt solution Ⅰ.

[0063] The preparation of double salt solution II: according to the mass ratio of sodium chloride: sodium nitrate = 4:6 ratio, weigh 6g of sodium chloride and 9g of sodium nitrate, put them into a beaker, add 60mL of distilled water, and put them under a magnetic field at 60°C Stir on a stirrer until completely dissolved, and cool at room temperature to obtain double salt solution II.

Embodiment 2

[0064] The preparation of embodiment 2 modified wood fibers

[0065] Preparation of modified wood fiber I: Weigh 20 g of wood fiber (purchased from Xuzhou Pucheng Wood Industry Co., Ltd.) that has been dried at 105°C for 24 hours, put it into a beaker, and slowly add 100 mL of the compound obtained in Example 1. The salt solution I was stirred evenly with a glass rod, and the double salt solution I was mixed with the wood fiber at a mass ratio of 5:1, and then immediately treated with ultrasonic waves for 1 hour (power 280W, frequency 47KHz), and the pretreated modified wood fiber Bake in a vacuum drying oven at 170°C for 2 hours, then wash with deionized water and pour it into a Buchner funnel for suction filtration. This process is cycled 10 times to obtain water-washed modified wood fibers, and the obtained filter residue is stored in a blast drying oven at 105°C. Dry in medium temperature, then pulverize with a high-speed universal pulverizer, dry in a vacuum oven at 80°C ...

Embodiment 3

[0072] Embodiment 3 Preparation of Phase Change Energy Storage Material

[0073] (1) Preparation of lauric acid-myristic acid dibasic fatty acid minimum eutectic mixture

[0074]The lowest eutectic temperature of the eutectic mixture is obtained by calculating the mass ratio (proportion) between the fatty acid phase change materials by Schroeder's formula. The mass ratio of lauric acid to palmitic acid was calculated to be 67.66:32.34. Take by weighing 6.766g of lauric acid and 3.234g of myristic acid and add them to a beaker, stir while heating on a magnetic stirrer at 60°C for 6 hours, and cool naturally at room temperature to obtain the lauric acid-myristic acid Minimal eutectic mixture of dibasic fatty acids.

[0075] image 3 It is a flow chart for the preparation of the lowest eutectic mixture of dibasic fatty acids, a is a single fatty acid, b is another fatty acid, c is a beaker, d is a magnetic stirrer, and e is the lowest eutectic mixture of dibasic fatty acids. ...

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Abstract

The invention discloses a modified wood fibre phase change energy storage material and a preparation method thereof. According to the modified wood fibre phase change energy storage material and the preparation method thereof, the pore diameters of wood fibres can be adjusted and controlled effectively, besides, porous structures of the wood fibres are improved, and the compatibility of the wood fibres and a phase change material is improved. The modified wood fibres are taken as a loading matrix of the phase change energy storage material; more phase change materials can be remained through the actions of hydrogen bonds, capillary force, intermolecular force and the like of the modified wood fibres, so that the enthalpy of phase change is improved; the modified wood fibres are combined with a fatty acid eutectic mixture, so that the requirement on low-temperature energy storage can be met; moreover, the phase change material prepared by the preparation method is degraded without heatin a phase change temperature range, which shows that the thermal stability of the modified wood fibre phase change energy storage material is high; and after 100 times of thermal cycle, the phase change material does not leak, which shows that the thermal reliability is high, and the thermal energy storage efficiency is high. The preparation method disclosed by the invention is simple in process;the wood fibres serving as the raw material are wide in source and low in cost; the raw materials do not need to be subjected to chemical treatment, and are environment-friendly and energy-saving, and the modified wood fibre phase change energy storage material has a wide application prospect in the field of solar energy utilization, building energy conservation and the like.

Description

technical field [0001] The invention belongs to the technical field of phase change energy storage materials, in particular to a modified wood fiber phase change energy storage material and a preparation method thereof. Background technique [0002] With the rapid development of the global industry, the problem of energy shortage is increasingly manifested, so we urgently need a new method to recycle the wasted energy or to develop and utilize new energy such as solar energy. Phase change energy storage is particularly attractive in terms of energy utilization due to its high energy storage density, large heat capacity, and small volume and mass. [0003] As a fatty acid phase change material, it has high phase change enthalpy, wide phase change temperature range, long service life, no overcooling, non-toxic, non-corrosive, small volume change, and compatibility with building materials Well, it has many advantages such as no degradation after repeated cold and heat cycles, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H8/00C09K5/06
Inventor 李丽萍麻丽云王清文郭垂根
Owner SOUTH CHINA AGRI UNIV
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