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

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...

Examples

Embodiment 1

[0056] Weigh 470g of anhydrous calcium chloride, add it into 470g of water under constant stirring, until it is completely dissolved to form a uniform and transparent solution, add 45g of strontium chloride hexahydrate and stir for 5min, after it is completely dissolved, add 15g of silica airgel to continue Stir for 1 hour to obtain a uniformly dispersed liquid compound 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 178 kJ / kg; after 2000 cycles, the phase change latent heat decays less than 5%.

[0058] Replace the nucleating agent in this example with barium sulfate, replace the phase separation inhibitor with diatomite, attapulgite, sepiolite or zeolite, and keep other preparation conditions unchanged, the phase change of the obtained composite energy storage material The temperature is between 27-29°C, and the phase change enthalpy is between 140-180kJ / kg...

Embodiment 2

[0060] Weigh 400g of anhydrous calcium chloride, add it into 400g of water under constant stirring, until it is completely 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 silicon dioxide Airgel + 49.5g sepiolite powder + 50g diatomite powder + 50g attapulgite powder were continuously stirred for 1 hour 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 phase change latent heat is 143 kJ / kg; after 2000 cycles, the phase change latent heat decays less than 5%.

[0062] The phase separation inhibitor in this example was replaced by a combination of silica airgel, diatomaceous earth, attapulgite, sepiolite and the other four components of zeolite, and the other preparation conditions remained unchanged, and the obtained com...

Embodiment 3

[0064] Weigh 450g of anhydrous calcium chloride, add it into 450g of water under constant stirring, until it is completely dissolved to form a uniform and transparent solution, add 5g of strontium chloride hexahydrate and stir for 5min, after it is completely dissolved, add 95g of diatomite powder and continue stirring After 0.5h, a uniformly dispersed liquid compound salt phase change material was obtained.

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

[0066] In this example, the nucleating agent is replaced by barium sulfate, the phase separation inhibitor is replaced by silica airgel, attapulgite, sepiolite or zeolite, and other preparation conditions remain unchanged, and the obtained composite energy storage material The phase change temperature is between 27-29°C, and the phase change enthalpy is b...

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...

Examples

Embodiment 1

[0056] Weigh 470g of anhydrous calcium chloride, add it into 470g of water under constant stirring, until it is completely dissolved to form a uniform and transparent solution, add 45g of strontium chloride hexahydrate and stir for 5min, after it is completely dissolved, add 15g of silica airgel to continue Stir for 1 hour to obtain a uniformly dispersed liquid compound 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 178 kJ / kg; after 2000 cycles, the phase change latent heat decays less than 5%.

[0058] Replace the nucleating agent in this example with barium sulfate, replace the phase separation inhibitor with diatomite, attapulgite, sepiolite or zeolite, and keep other preparation conditions unchanged, the phase change of the obtained composite energy storage material The temperature is between 27-29°C, and the phase change enthalpy is between 140-180kJ / kg...

Embodiment 2

[0060] Weigh 400g of anhydrous calcium chloride, add it into 400g of water under constant stirring, until it is completely 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 silicon dioxide Airgel + 49.5g sepiolite powder + 50g diatomite powder + 50g attapulgite powder were continuously stirred for 1 hour 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 phase change latent heat is 143 kJ / kg; after 2000 cycles, the phase change latent heat decays less than 5%.

[0062] The phase separation inhibitor in this example was replaced by a combination of silica airgel, diatomaceous earth, attapulgite, sepiolite and the other four components of zeolite, and the other preparation conditions remained unchanged, and the obtained com...

Embodiment 3

[0064] Weigh 450g of anhydrous calcium chloride, add it into 450g of water under constant stirring, until it is completely dissolved to form a uniform and transparent solution, add 5g of strontium chloride hexahydrate and stir for 5min, after it is completely dissolved, add 95g of diatomite powder and continue stirring After 0.5h, a uniformly dispersed liquid compound salt phase change material was obtained.

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

[0066] In this example, the nucleating agent is replaced by barium sulfate, the phase separation inhibitor is replaced by silica airgel, attapulgite, sepiolite or zeolite, and other preparation conditions remain unchanged, and the obtained composite energy storage material The phase change temperature is between 27-29°C, and the phase change enthalpy is b...

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