Composite phase-change energy storage material, and preparation method and application thereof

A composite phase transition and phase separation technology, applied in heat exchange materials, chemical instruments and methods, etc., can solve problems such as increasing fire prevention, mildew and decay, and achieve long service life, increase service life, and improve the effect of energy storage.

Active Publication Date: 2017-05-10
CHINA BUILDING MATERIALS ACAD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the actual effect of these organic thickeners is often limited by conditions such as thickener type, concentration, sy

Method used

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  • Composite phase-change energy storage material, and preparation method and application thereof
  • Composite phase-change energy storage material, and preparation method and application thereof
  • Composite phase-change energy storage material, and preparation method and application thereof

Examples

Experimental program
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Example Embodiment

[0055] Example one

[0056] Weigh 470g of anhydrous calcium chloride, add it to 470g of water under constant stirring, until all is dissolved to form a uniform and transparent solution, add 45g of strontium chloride hexahydrate and stir for 5min, when all is dissolved, add 15g of silica aerogel for continuous Stir for 1 hour to obtain a uniformly dispersed liquid composite salt phase change material.

[0057] The phase change temperature of the prepared phase change energy storage material is 28.5°C, and the phase change latent heat is 178kJ / kg; after 2000 cycles, the phase change latent heat attenuation is less than 5%.

[0058] Replace the nucleating agent in this example with barium sulfate, and replace the phase separation inhibitor with diatomaceous earth, attapulgite, sepiolite or zeolite, and other preparation conditions remain unchanged. The phase transition of the obtained composite energy storage material The temperature is between 27-29°C, and the phase change enthalpy is...

Example Embodiment

[0059] Example two

[0060] Weigh 400g of anhydrous calcium chloride, add to 400g of water under constant stirring, until all is dissolved to form a uniform and transparent solution, add 25g of strontium chloride hexahydrate + 25g of barium sulfate and stir for 10min to form a suspension, add 0.5g of silica Aerogel+49.5g sepiolite powder+50g diatomite powder+50g attapulgite powder is continuously stirred for 1h to obtain a uniformly dispersed liquid composite salt phase change material.

[0061] The phase change temperature of the prepared phase change energy storage material is 27.8°C, and the latent heat of phase change is 143kJ / kg; after 2000 cycles, the attenuation of the latent heat of phase change is less than 5%.

[0062] Replace the phase separation inhibitor in this example with a combination of the other four components of silica aerogel, diatomaceous earth, attapulgite, sepiolite and zeolite, and other preparation conditions remain unchanged, and the obtained composite Th...

Example Embodiment

[0063] Example three

[0064] Weigh 450g of anhydrous calcium chloride, add it to 450g of water under constant stirring, until all is dissolved to form a uniform and transparent solution, add 5g of strontium chloride hexahydrate and stir for 5min, when all is dissolved, add 95g of diatomaceous earth powder and continue stirring 0.5h to obtain a uniformly dispersed liquid composite salt phase change material.

[0065] The phase change temperature of the prepared phase change energy storage material is 28.1°C, and the phase change latent heat is 162kJ / kg; after 2000 cycles, the phase change latent heat attenuation is less than 5%.

[0066] The nucleating agent in this example was replaced with barium sulfate, and the phase separation inhibitor was replaced with silica aerogel, attapulgite, sepiolite or zeolite, and other preparation conditions were unchanged. The obtained composite energy storage material The phase change temperature is between 27-29°C, and the phase change enthalpy i...

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Abstract

The invention relates to a composite phase-change energy storage material and a preparation method thereof. The composite phase-change energy storage material is composed of the following components in percentage by mass: 80-95% of calcium chloride hexahydrate, 1.5-15% of phase separation inhibitor and 0-5% of nucleator. The preparation method of the composite phase-change energy storage material comprises the following steps: weighing equal mass of anhydrous calcium chloride and water, and stirring until the anhydrous calcium chloride is completely dissolved, thereby obtaining a first solution; adding the nucleator into the first solution, and stirring to obtain a second solution; and adding the phase separation inhibitor into the second solution, and stirring to obtain the liquid composite phase-change energy storage material. By using the calcium chloride hexahydrate as the phase-change material, the energy storage material has low degree of supercooling, can still keep the phase change complete after repeated circulations, has high energy storage rate, and is more suitable for practical application.

Description

technical field [0001] The invention relates to a phase change material, in particular to an inorganic composite phase change energy storage material and its preparation method and application. Background technique [0002] Building energy consumption accounts for about 1 / 3 of my country's total energy consumption. How to increase the application proportion of renewable energy in buildings, rationally utilize energy, and improve efficiency are prominent issues facing building energy conservation. The National Medium- and Long-term Science and Technology Development Plan (2006-2020) also clearly pointed out that energy is a key development field, and it is necessary to actively develop building energy-saving technologies, develop solar energy and other renewable energy utilization technologies, and develop energy-saving utilization technologies. [0003] At present, my country is still dominated by thermal power generation, which consumes a large amount of fossil energy resou...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 冀志江王晓燕王静李海建曹延鑫冯喆
Owner CHINA BUILDING MATERIALS ACAD
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