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Phase change energy storage material and preparation method thereof

A phase change energy storage material, a technology of hydrated aluminum sulfate, which is applied in the field of phase change energy storage, can solve the problems of supercooling of inorganic hydrated salts, poor heat storage performance, application and promotion restrictions, etc., to avoid phase separation and phase change enthalpy. The effect of high value, green and safe raw materials

Active Publication Date: 2021-12-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, inorganic hydrated salts are prone to problems such as "supercooling", "phase separation", "liquid phase leakage", and "low thermal conductivity", and the heat storage performance will deteriorate with the increase in the number of cycles, so the application and promotion are limited. very restrictive

Method used

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  • Phase change energy storage material and preparation method thereof
  • Phase change energy storage material and preparation method thereof
  • Phase change energy storage material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of phase change energy storage material, its preparation method comprises the following steps:

[0039] 1) Add 19.5g of potassium aluminum sulfate dodecahydrate and 10.5g of erythritol into a sealed glass bottle, stir evenly, then heat up to 90°C and stir for 2 hours at a constant temperature, with the stirring speed controlled at 500r / min, to obtain a molten mixture;

[0040] 2) 4.5 g of expanded graphite with a particle size of 25 μm and an expansion rate of 99% was dried at 80°C for 6 hours, then added to the molten mixture, and stirred at a constant temperature of 90°C for 8 hours under vacuum conditions. The stirring method was intermittent mechanical stirring. After 5 minutes, stop stirring for 2 hours, control the stirring speed at 500 r / min, cool at room temperature, and obtain the phase change energy storage material.

[0041] Performance Testing:

[0042] 1) The one-way differential scanning calorimetry diagram of the phase-change energy storage materi...

Embodiment 2

[0046] A kind of phase change energy storage material, its preparation method comprises the following steps:

[0047] 1) Add 16.5g of potassium aluminum sulfate dodecahydrate and 13.5g of erythritol into a sealed glass bottle, stir evenly, then raise the temperature to 90°C and stir for 2 hours at a constant temperature, and control the stirring speed at 500r / min to obtain a molten mixture;

[0048] 2) 3.0 g of expanded graphite with a particle size of 25 μm and an expansion rate of 99% was dried at 80° C. for 6 hours, then added to the molten mixture, and stirred at a constant temperature of 90° C. for 8 hours under vacuum conditions. The stirring method was intermittent mechanical stirring, each stirring Stop stirring for 1 hour after 10 minutes, control the stirring speed at 500 r / min, cool at room temperature, and obtain the phase change energy storage material.

[0049] Performance Testing:

[0050] The one-way differential scanning calorimetry diagram of the phase chang...

Embodiment 3

[0053] A kind of phase change energy storage material, its preparation method comprises the following steps:

[0054] 1) Add 18.0g of potassium aluminum sulfate dodecahydrate and 12.0g of erythritol into a sealed glass bottle, stir evenly, then raise the temperature to 90°C and stir for 1.5h at a constant temperature, and control the stirring speed at 500r / min to obtain a molten mixture ;

[0055] 2) 6.0 g of expanded graphite with a particle size of 25 μm and an expansion rate of 99% was dried at 80°C for 6 hours, then added to the molten mixture, and stirred at a constant temperature of 90°C for 6 hours under vacuum conditions. The stirring method was intermittent mechanical stirring. After 5 minutes, stop stirring for 1.5 hours, control the stirring speed at 500 r / min, cool at room temperature, and obtain the phase change energy storage material.

[0056] Performance Testing:

[0057] The one-way differential scanning calorimetry diagram of the phase change energy storage...

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Abstract

The invention discloses a phase change energy storage material and a preparation method thereof. The phase change energy storage material comprises the following components in parts by mass: 50-65 parts of hydrated aluminum sulfate salt, 35-50 parts of erythritol, and 5-20 parts of expanded graphite, wherein the sum of the parts by weight of the hydrated aluminum sulfate salt and the erythritol is 100. The preparation method of the phase change energy storage material comprises the steps of 1) mixing hydrated aluminum sulfate salt and erythritol, and heating until the mixture is completely molten to obtain a molten mixture; and 2) adding expanded graphite into the molten mixture, and mixing to obtain the phase change energy storage material. The phase change energy storage material has the advantages of high phase change enthalpy value, small supercooling degree, no phase separation, high thermal conductivity and the like, is low in cost, green and safe in raw material, mild in preparation condition and simple to operate, and can be used in the fields of clean heating, industrial waste heat recovery, solar photo-thermal conversion and the like.

Description

technical field [0001] The invention relates to the technical field of phase change energy storage, in particular to a phase change energy storage material and a preparation method thereof. Background technique [0002] Latent heat energy storage, also known as phase change energy storage, is a high-tech energy storage technology that uses materials to absorb or release heat during phase change to store or release energy. Latent heat energy storage can solve the imbalance problem of energy supply and demand in time and space. It is one of the energy storage methods with great application prospects at this stage. It can be used in fields such as waste heat recovery and utilization. [0003] Phase change materials are the core of latent heat energy storage technology, and their performance is directly related to the efficiency of thermal energy utilization. In order to ensure efficient utilization of energy in practical applications, the phase change temperature of phase cha...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063Y02E60/14
Inventor 汪双凤丘文娟白羽陈伟程方玉堂
Owner SOUTH CHINA UNIV OF TECH
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