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Phase change material for solar energy storage

A phase change energy storage material and solar energy technology, which is applied in the field of phase change energy storage materials, can solve the problems of reducing heat transfer and enthalpy value of thickener, system deterioration, and heat storage capacity, etc., so as to improve thermal conductivity and enthalpy. The effect of small value change and strong thermal stability

Active Publication Date: 2016-09-21
河北昊宇新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The addition of thickener not only reduces the heat transfer and enthalpy of the system, but also leads to the gradual deterioration of the system and the rapid decline in heat storage capacity as the number of cycles increases.

Method used

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  • Phase change material for solar energy storage
  • Phase change material for solar energy storage
  • Phase change material for solar energy storage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] With 800g of sodium acetate trihydrate as the main raw material, after heating and melting at 70°C, add 80g of nucleating agent (64g of ethanol, 16g of potassium fluoroborate), after stirring, add 200g of 300-mesh expanded graphite, after stirring evenly, The phase change material obtained by cooling is 58.6°C, and after 5000 cycles, the enthalpy value is 258.1J / g (see figure 2 ) and blank test results 264J / g ( figure 1 ) compared to the attenuation of 2.2%.

Embodiment 2

[0028] Use 850g of sodium acetate trihydrate as the main raw material, heat and melt at 70°C, add 50g of nucleating agent (45g of ethanol, 5g of potassium fluorosilicate), after stirring, add 70g of 100-mesh expanded graphite, stir evenly , the phase change material obtained by cooling is 58.6°C, and after 5000 cycles, the enthalpy value is 253.2J / g (see image 3 ), and the blank test result 264J / g ( figure 1 ) compared to attenuation of 4%.

Embodiment 3

[0030] Use 820g of sodium acetate trihydrate as the main raw material, heat and melt at 70°C, add 60g of nucleating agent (51g of ethanol, 9g of potassium fluoroaluminate), stir and add 120g of 200-mesh expanded graphite, stir well , the phase change material obtained by cooling is 58.63°C, and after 5000 cycles, the enthalpy value is 248.4J / g (see Figure 4 ). And blank test result 264J / g ( figure 1 ) compared to 5.9% attenuation.

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Abstract

The invention relates to a phase change material for solar energy storage. The material is composed of 80-85% of sodium acetate trihydrate, 5-8% of nucleating agent and 7-15% of sizing carrier, wherein the nucleating agent is a mixture of ethyl alcohol and fluoric acid kali salt, and the sizing carrier is expanded graphite. The problems of condensate depression and phase separation when sodium acetate trihydrate is used as a solar energy storage material can be solved. According to the phase change material, crystal form nucleation is conducted by means of fluoric acid kali salt, and nucleation is achieved quickly by means of surface tension of a phase interface formed when ethyl alcohol makes contact with the phase change material. The combination of the two nucleation modes generates a mutual induction effect, and failure of a single nucleation mode caused by ultrahigh transient temperature in practical use is avoided.

Description

technical field [0001] The invention relates to the technical field of phase change energy storage materials, in particular to a phase change energy storage material used for solar heat storage. Background technique [0002] The application of solar energy technology has been very mature, and all countries are doing more research on the effective use of solar energy and the broadening of application fields. In daily life, vacuum heat collecting tubes are often used to store heat in the water tank for use during the day or at night. However, this vacuum tube type solar water heater has the disadvantages of fouling, unstable outlet water temperature, and stagnant water quality for top water exchange. The application of phase-change energy storage materials can just make up for the disadvantages of traditional solar water heaters. It can not only inhibit the scaling caused by excessive temperature, but also has the advantages of high heat storage density, secondary heat exchan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 杜兔平李智威贾蓉蓉崔宇飞
Owner 河北昊宇新能源科技有限公司
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