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Porous alumina composite shaped phase change material and preparation method thereof

A technology of porous alumina and phase change materials, applied in chemical instruments and methods, botanical equipment and methods, heat exchange materials, etc., can solve the problems of plant growth temperature, phase stratification, liquid phase leakage, and thermal conductivity. Large and other problems, to achieve the effect of enhanced heat storage and release function, high phase transition temperature, and large specific surface area

Active Publication Date: 2020-10-30
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Phase change heat storage material Na 2 SO 4 10H 2 O has a high phase change latent heat value and unit heat storage density. It is cheap, widely sourced, non-toxic, non-corrosive, and has a large thermal conductivity. It has been widely used in the field of medium and low temperature building walls, but phase stratification and liquid Problems such as phase leakage have been difficult to effectively solve
[0004] At the same time, the solar greenhouse requires the temperature required for plant growth to be 15-25°C, but Na 2 SO 4 10H 2 The phase transition temperature of O is higher (>30°C), and Na 2 SO 4 10H 2 O Applied to the production of solar greenhouse wall materials, it is difficult to ensure the growth temperature required by plants

Method used

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  • Porous alumina composite shaped phase change material and preparation method thereof
  • Porous alumina composite shaped phase change material and preparation method thereof
  • Porous alumina composite shaped phase change material and preparation method thereof

Examples

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example 1

[0049] Raw material ratio: Na 2 SO 4 10H 2 O 70wt%, porous alumina 30wt%; preparation steps are as follows ( Figure 4 ):

[0050] First, weigh 20g Na with an electronic balance 2 SO 4 10H 2 O, put it in a beaker, seal the beaker with plastic wrap, place it in a constant temperature water bath at 50°C and heat it for 1 hour to obtain a molten sample.

[0051] Then take out the beaker, uncover the plastic wrap, add porous alumina to the molten sample, cover the plastic wrap and continue to stir and mix at 50°C for 2 hours to make the raw materials evenly stirred. Finally, peel off the plastic wrap, put the beaker into a vacuum drying oven, use a vacuum pump to remove the air in the drying oven until the pressure of the vacuum drying oven is 40kpa, and vacuum physical adsorption for 4 hours at room temperature to prepare a porous alumina composite shaped phase transition Material( Image 6 ).

[0052] The step cooling curve (see image 3 ) and the DSC curve at a heatin...

example 2

[0054] Raw material ratio: Na 2 SO 4 10H 2 O 80wt%, porous alumina 20wt%; The preparation steps are as follows ( Figure 4 ):

[0055] First, weigh 20g Na with an electronic balance 2 SO 4 10H 2 O, put it in a beaker, seal the beaker with plastic wrap, place it in a constant temperature water bath at 50°C and heat it for 1 hour to obtain a molten sample.

[0056] Then take out the beaker, uncover the plastic wrap, add porous alumina to the molten sample, cover the plastic wrap and continue to stir and mix at 50°C for 2 hours to make the raw materials evenly stirred. Finally, peel off the plastic wrap, put the beaker into a vacuum drying oven, use a vacuum pump to remove the air in the drying oven until the pressure of the vacuum drying oven is 40kpa, and vacuum physical adsorption for 4 hours at room temperature to prepare a porous alumina composite shaped phase transition Material.

[0057] The step cooling curve of the obtained composite shaped phase change material ...

example 3

[0059] Raw material ratio: Na 2 SO 4 10H 2 O 90wt%, porous alumina 10wt%; preparation steps are as follows ( Figure 4 ):

[0060] First, weigh 20g Na with an electronic balance 2 SO 4 10H 2 O, put it in a beaker, seal the beaker with plastic wrap, place it in a constant temperature water bath at 50°C and heat it for 1 hour to obtain a molten sample.

[0061] Then take out the beaker, uncover the plastic wrap, add porous alumina to the molten sample, cover the plastic wrap and continue to stir and mix at 50°C for 2 hours to make the raw materials evenly stirred. Finally, peel off the plastic wrap, put the beaker in a vacuum drying oven, use a vacuum pump to remove the air in the drying oven until the pressure of the vacuum drying oven is 35kpa, and vacuum physical adsorption for 4 hours at room temperature to prepare a porous alumina composite shaped phase transition Material.

[0062] The step cooling curve of the obtained composite shaped phase change material at a c...

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Abstract

The invention discloses a porous alumina composite shaped phase change material and a preparation method thereof. The preparation method comprises the steps: putting Na2SO4.10H2O into a constant-temperature water bath kettle, and heating to a molten state; and then adding porous aluminum oxide according to the mass ratio of 10-30 wt%, uniformly stirring and mixing, and then putting the mixture into a vacuum drying oven for adsorption and fixation, so as to prepare the porous aluminum oxide composite shaped phase-change material. The porous alumina composite shaped phase-change material prepared by the method can effectively enhance the heat storage and release functions of a solar greenhouse wall body, thereby meeting the growth requirements of plants.

Description

technical field [0001] The invention relates to a modified phase change energy storage material, in particular to a phase change material prepared by vacuum physical adsorption of porous alumina. Background technique [0002] The solar greenhouse is an important agricultural facility for producing off-season crops, and has the advantages of low cost and high energy saving. The heat storage of a solar greenhouse has an important impact on crop growth, and the heat source mainly depends on the heat storage and release process of the wall. However, the external environment has a significant impact on the heat storage of the solar greenhouse: in sunny weather, the daytime temperature of the solar greenhouse can reach above 30°C, and the surplus heat is as high as 270-490MJ / d; in cloudy and rainy weather, the heat stored in the solar greenhouse is not enough To maintain the growth of crops, surplus heat and insufficient heat all affect the growth and development of crops. There...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06A01G9/14A01G9/24
CPCC09K5/063A01G9/14A01G9/243A01G9/24Y02A40/25
Inventor 衣雪梅张文杰张森景
Owner NORTHWEST A & F UNIV
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