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Low-temperature inorganic phase-change heat storage material and preparation method thereof

A heat storage material, inorganic phase change technology, applied in heat exchange materials, chemical instruments and methods, etc., can solve problems such as the inability to meet production requirements, and achieve the effects of suitable phase change temperature, stable performance and low price

Inactive Publication Date: 2014-08-27
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This obviously does not meet production requirements

Method used

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  • Low-temperature inorganic phase-change heat storage material and preparation method thereof

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preparation example Construction

[0020] The preparation method of the above-mentioned low-temperature inorganic phase-change thermal storage material comprises the following steps:

[0021] 1) Put the test tube containing disodium hydrogen phosphate dodecahydrate into hot water at a constant temperature of 50°C, and stir until completely melted;

[0022] 2) then add the Potassium Chloride of recipe amount in dodecahydrate disodium hydrogen phosphate, melt, obtain dodecahydrate disodium hydrogen phosphate and potassium chloride mixture, the dodecahydrate disodium hydrogen phosphate and potassium chloride mixture The phase transition temperature drops to 26.5°C, and the supercooling degree is 10.7°C;

[0023] 3) Add nucleating agent graphite and thickener sodium metasilicate nonahydrate to the mixture of disodium hydrogen phosphate dodecahydrate and potassium chloride, heat and melt to prepare a phase transition temperature of about 25°C, and a phase transition latent heat value of 170J / g or so, supercooling ...

Embodiment 1

[0029] The low-temperature phase-change heat storage material prepared in this embodiment is composed of the following raw materials in mass percentage: Na 2 HPO 4 12H 2 O: 86.2%; Potassium chloride: 6.9%; Graphite: 1.7%; Sodium metasilicate nonahydrate: 5.2%.

[0030] Tested by the applicant, the low-temperature inorganic phase change heat storage material prepared in this example has a latent heat value of 166 J / g, a melting temperature of 24.7°C, an undercooling degree of less than 0.5°C, no phase separation, and stable performance. The endothermic and exothermic performances are stable after 3000 cycles.

Embodiment 2

[0032] The low-temperature phase-change heat storage material prepared in this embodiment is composed of the following raw materials in mass percentage: Na 2 HPO 4 12H 2 O: 86.6%; Potassium chloride: 6.8%; Graphite: 1.3%; Sodium metasilicate nonahydrate: 5.3%.

[0033] Tested by the applicant, the low-temperature inorganic phase change heat storage material prepared in this example has a latent heat value of 169 J / g, a melting temperature of 25.3°C, an undercooling degree of less than 0.5°C, no phase separation, and stable performance. The endothermic and exothermic performances are stable after 3000 cycles.

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Abstract

The invention discloses a low-temperature inorganic phase-change heat storage material and a preparation method thereof. The low-temperature inorganic phase-change heat storage material is prepared from the following raw materials in percentage by mass: 85-90% of disodium hydrogen phosphate dodecahydrate, 5-10% of potassium chloride, 5-8% of sodium metasilicate nonahydrate and 1-5% of graphite, totaling 100%. The phase-change temperature of the inorganic phase-change heat storage material is 25 DEG C or so, the phase-change latent heat value is 170J / g or so, and the degree of supercooling is 0-0.5 DEG C; and the inorganic phase-change heat storage material does not have the phenomenon of phase separation after long-term usage, is suitable for agricultural production greenhouses and agricultural buildings, and can be used for other heat storage and cold storage systems.

Description

technical field [0001] The invention relates to a phase-change thermal storage material, in particular to a low-temperature inorganic phase-change thermal storage material and a preparation method thereof. Background technique [0002] The suitable temperature for the growth of greenhouse crops is 10°C to 30°C. Disodium hydrogen phosphate dodecahydrate (Na 2 HPO 4 12H 2 The phase transition temperature of O) is 35.7°C, and the phase transition temperature has exceeded the upper limit temperature of crop growth. This means that only when the greenhouse temperature reaches 35°C and above, the phase change material disodium hydrogen phosphate dodecahydrate (Na 2 HPO 4 12H 2 O) began to melt heat storage. However, the temperature in the actual greenhouse is lower than this temperature in most periods of time, which will lead to two results: one is that the temperature in the actual greenhouse is relatively low, and the phase change heat storage only works at relatively hi...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 李凯王宏丽
Owner NORTHWEST A & F UNIV
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