Composite phase change material for clean heating and preparation method thereof

A composite phase change material and heating technology, applied in the field of phase change material and its preparation, can solve the problems of high thermal conductivity, restricting application, losing the value of heat storage, etc.

Inactive Publication Date: 2020-11-24
SHAANXI NORTHWEST POWER GENERATION CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Too cold so that it can no longer release the stored latent heat in the required temperature range and lose the value of heat storage
Phase separation makes the system repeat the heating-cooling thermal cycle, and more and more sediments are deposited at the bottom, resulting in less and less effective heat storage medium, and finally makes the heat storage capacity of the system worse and worse
[0004] The phase transition temperature of magnesium nitrate hexahydrate is 89.3°C, and the crystallization water begins to be removed at 50°C. As a single phase change material, the heat of fusion is large, the thermal conductivity is high, the phase transition volume is small, and the price is cheap, but it is prone to supercooling and phase separation phenomenon, and has defects such as corrosion and easy leakage, which limits the application of magnesium nitrate hexahydrate
[0005] Sodium salts of organic acids such as sodium acetate (CH3COONa 3H 2 O, SAT) belongs to the medium and low temperature phase change energy storage material, its melting point is 58 ℃, it has the advantages of high melting heat, good thermal conductivity, non-toxic, low price and wide source, but its supercooling and phase separation phenomenon Obviously, it seriously restricts the application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) The raw materials are based on the mass ratio of Mg(NO 3 ) 2 ·6H 2 O accounts for 85 parts, CH 3 COONa·3H 2 O accounts for 10 parts, nucleating agent Na 2 SiO 3 9H 2 O accounted for 5 parts mixed, grinded in a mortar and mixed evenly;

[0017] (2) Heat and melt the mixture in step (1) in a constant temperature bath at 80-100°C, 500r. min -1 Stir magnetically for 2 hours to obtain a clear and transparent molten composite phase change material;

[0018] (3) Cool to room temperature to obtain magnesium nitrate hexahydrate-sodium acetate composite phase change material.

Embodiment 2

[0020] (1) The raw materials are based on the mass ratio of Mg(NO 3 ) 2 ·6H 2 O accounts for 90 parts, CH 3 CH 2 COONa·H 2 O accounts for 8 parts, the nucleating agent Na 2 SiO 3 9H 2 O accounted for 2 parts mixed, grinded in a mortar and mixed evenly;

[0021] (2) Heat and melt the mixture in step (1) in a constant temperature bath at 90°C, 800r. min -1 Stir magnetically for 2.5 hours to obtain a clear and transparent molten composite phase change material;

[0022] (3) Cool to room temperature to obtain magnesium nitrate hexahydrate-sodium propionate composite phase change material.

Embodiment 3

[0024] (1) The raw materials are based on the mass ratio of Mg(NO 3 ) 2 ·6H 2 O accounts for 85 parts, CH 3 COONa·3H 2 O accounts for 10 parts, nucleating agent Na 2 HPO 4 12H 2 O accounted for 5 parts mixed, grinded in a mortar and mixed evenly;

[0025] (2) Heat and melt the mixture in step (1) in a constant temperature bath at 98°C, 500r. min -1 Stir magnetically for 2 hours to obtain a clear and transparent molten composite phase change material;

[0026] (3) Cool to room temperature to obtain magnesium nitrate hexahydrate-sodium acetate composite phase change material.

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Abstract

The invention relates to the field of phase change energy storage, and particularly provides a composite phase change material for clean heating and a preparation method thereof. The heat storage material comprises the following raw materials in parts by mass: 70-90 parts of magnesium nitrate hexahydrate, 3-20 parts of an organic acid sodium salt and 3-10 parts of a nucleating agent. The compositephase change material provided by the invention has the advantages of small supercooling degree, large latent heat of phase change, high stability, no phase separation, simplicity in preparation, andconvenience in packaging and industrial production.

Description

technical field [0001] The invention belongs to the technical field of heat storage of composite materials, and in particular relates to a composite phase change material based on magnesium nitrate hexahydrate-organic acid sodium salt and a preparation method thereof. Background technique [0002] Phase change materials store and release latent heat by changing the state of matter with temperature changes. Using the characteristics of constant temperature during the phase change process, the temperature can be controlled within a specific range. It is a heat storage material with excellent performance and is gradually being widely used in aviation. Aerospace thermal control, building energy saving, automotive heat dissipation, clothing intelligent temperature regulation, power battery thermal management, medical and health care, electronic device cooling and military camouflage and other fields. [0003] There are many kinds of inorganic phase change materials, and crystalli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 李晓倩杜晓
Owner SHAANXI NORTHWEST POWER GENERATION CORP
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