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Phase-change cold storage compound and preparation method thereof

A phase change cold storage and composite technology, applied in chemical instruments and methods, heat exchange materials, etc., can solve the problems of phase separation, phase change temperature control, insufficient stability and thermal conductivity, and shorten the cold storage and cooling time. , The effect of reducing product supercooling and high stability

Inactive Publication Date: 2020-06-23
内蒙古信敏惠纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although to Na 2 SO 4 10H 2 There are many studies on O phase change cold storage materials, but there are still deficiencies in terms of phase separation, phase change temperature control, stability and thermal conductivity of materials, and there is still a need for improvement

Method used

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  • Phase-change cold storage compound and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 100g of sodium sulfate decahydrate, 0.5g of borax, 2g of potassium chloride, 16g of ammonium chloride, 1g of ammonium sulfate, and 2g of sodium dihydrogen phosphate and mix them evenly, add them to the reaction vessel, and set the temperature of the reactor to 40-60 ℃. After the mixed material was completely melted, the reactor was started to stir, and 1 g of sodium carboxymethyl cellulose and 3 g of graphene nanosheets were added in sequence, and the stirring was continued for 30 min, and then cooled to obtain a phase change cold storage composite.

[0032] The supercooling degree of the phase change cold storage composite in this example is 3°C, and the average phase transition temperature is 5.3°C; the time required for the composite to cool down from room temperature to -5°C is 44 minutes. The latent heat of phase change is 160J / g, and there is no obvious stratification phenomenon.

Embodiment 2

[0034] Weigh 100g of sodium sulfate decahydrate, 1.5g of borax, 2g of potassium chloride, 16g of ammonium chloride, 1g of ammonium sulfate, and 2g of sodium dihydrogen phosphate and mix them evenly, add them to the reaction vessel, and set the temperature of the reactor to 40-60 ℃. After the mixed material was completely melted, the reactor was started to stir, and 1 g of sodium carboxymethyl cellulose and 3 g of graphene nanosheets were added in sequence, and the stirring was continued for 30 min, and then cooled to obtain a phase change cold storage composite.

[0035] The degree of supercooling of the phase-change cold storage composite in this embodiment is 0.3°C, and the average phase transition temperature is 5.1°C; the time required for the composite to cool from room temperature to -5°C is 43min (such as figure 1 shown). The latent heat of phase change is 162J / g, and there is no obvious stratification phenomenon; after 10 cold storage and cooling experiments on the co...

Embodiment 3

[0037]Weigh 100g of sodium sulfate decahydrate, 5g of borax, 2g of potassium chloride, 16g of ammonium chloride, 1g of ammonium sulfate, and 2g of sodium dihydrogen phosphate and mix them evenly. . After the mixed material was completely melted, the reactor was started to stir, and 1 g of sodium carboxymethyl cellulose and 3 g of graphene nanosheets were added in sequence, and the stirring was continued for 30 min, and then cooled to obtain a phase change cold storage composite.

[0038] The supercooling degree of the phase change cold storage composite in this example is 0.2°C, and the average phase transition temperature is 5.5°C; the time required for the composite to cool down from room temperature to -5°C is 47 minutes. The latent heat of phase change is 140J / g, and there is no obvious stratification phenomenon.

[0039] Examples 1-3 show that within a certain range, with the increase of the amount of borax added, the degree of supercooling of the phase-change cold stora...

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Abstract

The invention relates to a phase-change cold storage compound and a preparation method thereof. The phase-change cold storage compound comprises sodium sulfate decahydrate, a nucleating agent, a thickening agent and a temperature regulator. Wherein based on 100 parts by mass of the sodium sulfate decahydrate, the mass parts of the nucleating agent, the thickening agent and the temperature regulator are respectively 0.5-5 parts, 0.5-5 parts and 10-20 parts; wherein the phase-change cold storage compound further comprises a carbon nano material, and based on 100 parts by mass of the sodium sulfate decahydrate, the mass part of the carbon nano material is 1-5 parts. By optimizing the formula design of the phase-change cold storage composite material, the composite material has the characteristics of safety, no toxicity, low production cost, small degree of supercooling, high cold storage density and good material stability, and can be applied to use scenes needing 4-8 DEG C, such as a phase-change cold storage system of an air conditioner.

Description

technical field [0001] The invention belongs to the field of phase-change cold storage materials, and in particular relates to a phase-change cold storage compound and a preparation method thereof. Background technique [0002] With the development of the economy and the improvement of people's living standards, my country's power supply is increasingly tense, and the contradiction between supply and demand of urban power grids is particularly prominent in summer. As an important technical means of power load management strategy, cold storage technology is applied to air conditioning system, which can shift peaks and valleys and balance power loads. Currently commonly used cold storage media include water, ice, eutectic salts, and gas hydrates. For the water storage system, it takes up a huge space; the ice storage system decreases the ice production efficiency due to the decrease of the evaporation temperature; the gas hydrate is still far away from the practicality of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/066Y02E60/14
Inventor 张小诗张建祥刘学永李金来
Owner 内蒙古信敏惠纳米科技有限公司
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