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Composite solid-solid phase change heat storage material and preparation method thereof

A phase change heat storage material and mixture technology, which is applied in the energy field, can solve the problems of poor thermal stability and long-term thermal stability, large phase change temperature range, phase separation, etc., and achieves narrow inorganic phase change temperature range. Scientific and reasonable, overcome the effect of low thermal conductivity

Inactive Publication Date: 2018-03-23
TIANJIN RUIKUN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, they have disadvantages such as low thermal conductivity, leakage, phase separation and supercooling, and the phase transition temperature range of the material is relatively large, thermal stability and long-term thermal stability are poor, so it is necessary to provide a new composite solid-solid phase transition Heat storage material to solve the above technical problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0015] Further, the present invention also provides a method for preparing the above-mentioned composite solid-solid phase change heat storage material, the method comprising the following steps:

[0016] (1) Combine expanded graphite, Ba(OH) 2 ·8H 2 O and KH 2 PO 4 Weigh and mix uniformly according to the weight ratio to obtain a mixture, and put the mixture into a reaction container;

[0017] (2) Add distilled water that is 1.5 to 1.8 times the weight of expanded graphite into the above reaction vessel, continue vacuuming during the reaction process, stir and adsorb at 83 to 86°C for 3 to 4 hours, and shake vigorously every half an hour during the adsorption process The container lasts for 40-50 seconds; after the adsorption is completed, pour out the reaction product, and obtain the final product after natural cooling.

[0018] The present invention uses expanded graphite as the anti-phase separation material, which can also reduce the volume change in the phase change ...

Embodiment 1

[0021] The composite solid-solid phase change heat storage material is prepared by the following method, which includes the following steps:

[0022] (1) 6g of expanded graphite, Ba(OH) 2 ·8H 2 O 93g and KH 2 PO 4 1g is weighed and mixed uniformly to obtain a mixture, and the mixture is packed into a reaction vessel;

[0023] (2) Add distilled water that is 1.5 times the weight of expanded graphite to the above reaction vessel, continue vacuuming during the reaction process, stir and adsorb at 85°C for 3 hours, and shake the reaction vessel vigorously for 45 seconds every half an hour during the adsorption process; after the adsorption is completed , The reaction product was poured out, and the final product was obtained after natural cooling.

[0024] After testing, the phase transition temperature of the composite solid-solid phase change heat storage material obtained in this example is 79.4°C, and the latent heat of phase change is 267kJ / kg; compared with the pure sub...

Embodiment 2

[0026] The composite solid-solid phase change heat storage material is prepared by the following method, which includes the following steps:

[0027] (1) 5g of expanded graphite, Ba(OH) 2 ·8H 2 O 94g and KH 2 PO 4 1g is weighed and mixed uniformly to obtain a mixture, and the mixture is packed into a reaction vessel;

[0028] (2) Add distilled water that is 1.6 times the weight of expanded graphite to the above reaction vessel, continue vacuuming during the reaction process, stir and adsorb at a temperature of 84°C for 3.5h, and shake the reaction vessel vigorously for 50s every half an hour during the adsorption process; the adsorption is completed Finally, the reaction product was poured out, and the final product was obtained after natural cooling.

[0029] After testing, the phase transition temperature of the composite solid-solid phase change heat storage material obtained in this example is 78.1°C, and the latent heat of phase change is 253kJ / kg; compared with the ...

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Abstract

The invention relates to a phase change heat storage material, and particularly discloses a composite solid-solid phase change heat storage material and a preparation method thereof. The phase changeheat storage material is prepared from the following components in parts by weight: 90-95 parts of Ba(OH)2.8H2O, 5-8 parts of expanded graphite and 1-2 parts of KH2PO4. The components of the materialare blended scientifically and reasonably, an inorganic phase change temperature ranges from 78 DEG C to 80 DEG C, latent heat of phase change ranges from 230 kJ / kg to 270 kJ / kg, and the shortcomingsof low heat conduction, leakage, phase separation, excessive cold and the like of a single phase change material can be overcome effectively; and the thermal stability and long-time stability of the material are good. Compared with pure substances, the phase change heat storage material has the advantages that the heat storage time can be shortened by 42.6-45.5%, the heat release time can be shortened by 52.4-55.1%, and liquid is not generated in a phase change process.

Description

technical field [0001] The invention belongs to the field of energy technology, and relates to a phase change heat storage material, in particular to a composite solid-solid phase change heat storage material and a preparation method thereof. Background technique [0002] Due to the rise in energy prices and the risk of fossil energy depletion, it is imperative to develop renewable resources and strengthen the recovery of waste heat. However, most of these resources have low energy flow density and are unstable, such as solar energy and wind energy. Therefore, it is necessary to store energy, store temporarily unused energy, and release it when needed. Various energy storage methods: sensible heat energy storage, chemical energy storage and phase change energy storage have also emerged as the times require. Among them, phase change energy storage has been favored by researches due to its advantages of high energy storage density, economy and applicability, and constant temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/02
CPCC09K5/02
Inventor 唐华
Owner TIANJIN RUIKUN TECH
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