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Air-conditioning cold storage phase change material and preparation method thereof

A technology of phase change materials and inorganic phase change materials, which is applied in the field of air-conditioning cold storage phase change materials and its preparation, can solve the problems of phase change material phase change energy storage function disappearing, low cold storage density, and inability to completely absorb water, etc., to achieve a solution Phase separation problem, effect of improving heat storage and cold storage performance

Inactive Publication Date: 2019-04-12
SHANDONG IND TECH RES INST OF ZHEJIANG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

There are many disadvantages in water cold storage: the cold storage density is low, and the water storage tank is bulky; the water of different temperatures in the cold storage tank is easy to mix, which affects the stored cold capacity in the cold storage tank.
During the crystallization process, small particles are formed in the two-phase region. Due to the action of gravity, they settle and precipitate in the liquid hydrated salt, and form high-density small particles at the bottom. These small particles cannot completely absorb water, so the peritectic process cannot be completed. As a result, phase separation occurs, which will cause the disappearance of the phase change energy storage function of the phase change material

Method used

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  • Air-conditioning cold storage phase change material and preparation method thereof
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preparation example Construction

[0044] The preparation method of the phase change material is:

[0045] In the first step, calcium chloride hexahydrate and a small amount of deionized water are added to the reaction vessel, and heated at 75°C for 2-3 hours;

[0046] In the second step, in the reaction vessel of the first step, add hydroxylated carbon nanotubes and porous thin-layer graphene in proportion, stir evenly, place it in the refrigerator for 12 hours, take it out and place it in the air for 20 hours, and obtain the inorganic phase variable material;

[0047] In the third step, paraffin is used to coat the inorganic phase change material. Specifically, the paraffin is added to n-hexane, completely dissolved, and then the phase change material obtained in the second step is added, and stirred at room temperature for 5 hours at a stirring speed of 400 rpm. Then filter and dry the filter cake to obtain the paraffin-coated inorganic phase change material.

[0048] The present invention also provides a ...

Embodiment 1

[0057] Add calcium chloride hexahydrate and a small amount of deionized water into the reaction vessel, and heat at 75°C for 3 hours to obtain a hydrated salt, according to the mass ratio of hydrated salt: hydroxylated carbon nanotubes: porous thin-layer graphene = 1: 1:0.4, further add hydroxylated carbon nanotubes and porous thin-layer graphene to the container for preparing the hydrated salt, stir evenly, place it in the refrigerator for 12 hours, take it out and place it in the air for 20 hours, and obtain an inorganic phase change material. Add paraffin into n-hexane, dissolve completely, then add the inorganic phase change material obtained above, stir at room temperature for 5 hours at a stirring speed of 400 rpm, then filter, and dry the filter cake to obtain a paraffin-coated inorganic phase change material.

Embodiment 2

[0069] Compared with Example 1, hydrated salt: hydroxylated carbon nanotubes: porous thin-layer graphene = 1:1:0.3.

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Abstract

The invention relates to the technical field of air conditioners, in particular to an air-conditioning cold storage phase change material and a preparation method thereof. The air-conditioning cold storage phase change material comprises hydrated salts, hydroxylated carbon nanotubes and porous thin-layer graphene. The characteristics of excellent thermal conductivity, self-lubricating performanceand high bonding performance of graphene are utilized fully, and graphene is designed into a porous shape, so that the problem of phase separation of phase change energy storage materials is solved, and the thermal storage and cold storage performance of the phase change material are further improved.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to an air conditioner cold storage phase change material and a preparation method thereof. Background technique [0002] In order to save energy and reduce consumption, and ease the tension in power supply and the imbalance between power supply and demand, my country has adopted a series of control measures, such as vigorously promoting the peak-valley time-of-use electricity price system. Cold storage air conditioners can realize the "peak shifting and valley filling" of electricity and effectively reduce the capacity of the power grid. It is one of the energy-saving measures vigorously promoted by the country. [0003] At present, there are three main types of air-conditioning cold storage materials: water, ice and phase change materials. Water storage uses the sensible heat of water between 4°C and 7°C for cold storage, and conventional refrigeration units can be used t...

Claims

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Application Information

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IPC IPC(8): C09K5/06C09K5/14
CPCC09K5/063C09K5/066C09K5/14Y02E60/14
Inventor 陈威周明新
Owner SHANDONG IND TECH RES INST OF ZHEJIANG UNIV
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