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Preparation method of disodium hydrogen phosphate heat storage system suitable for greenhouses

A disodium hydrogen phosphate heat storage technology, which is applied in the field of agricultural engineering, can solve the problems affecting the production of greenhouse crops and the safe overwintering of greenhouse vegetables, and achieves the effects of low price, high latent heat density, and simple and convenient preparation

Inactive Publication Date: 2016-06-22
XINJIANG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the heat storage and release capacity of the heat storage material directly affects whether the greenhouse vegetables can survive the winter safely, thus directly affecting the greenhouse crop yield.

Method used

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  • Preparation method of disodium hydrogen phosphate heat storage system suitable for greenhouses
  • Preparation method of disodium hydrogen phosphate heat storage system suitable for greenhouses
  • Preparation method of disodium hydrogen phosphate heat storage system suitable for greenhouses

Examples

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Embodiment 1

[0014] Embodiment 1: the raw material that this embodiment adopts is Na 2 HPO 4 12H 2 O crystal (DisodiumHydrogenPhosphate), molecular weight 358.14, relative density 1.52, melting point 35.5°C, solid at room temperature, colorless transparent monoclinic prismatic crystal. Nucleating agent: graphite, stabilizer: sodium silicate nonahydrate. at 100 parts Na 2 HPO 4 12H 2 O Add 8 parts of KCl, 0.5~02 parts of graphite, and 6 parts of sodium silicate, mix well, heat to 60°C until completely melted, and stir evenly. The homogeneous solution was placed at room temperature to obtain a thermal storage material.

[0015] The calcium chloride hexahydrate heat storage material prepared above was passed through the melting-cooling cycle method, and the phase transition temperature was determined to be 25° C., no supercooling and phase separation occurred, and the performance was stable.

Embodiment 2

[0016] Embodiment 2: the raw material that this embodiment adopts is Na 2 HPO 4 12H 2 O crystal, same as example one. Nucleating agent: graphite; Stabilizer: sodium silicate nonahydrate. The difference from Example 1 is 100 parts of Na 2 HPO 4 12H 2 O Add 8 parts of KCl, 0.5~02 parts of graphite, and 8 parts of sodium silicate, mix well, heat to 60°C until completely melted, and stir evenly. The homogeneous solution was placed at room temperature to obtain a thermal storage material.

[0017] The calcium chloride hexahydrate heat storage material prepared above was passed through the melting-cooling cycle method, and the phase transition temperature was determined to be 25° C., no supercooling and phase separation occurred, and the performance was stable.

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Abstract

The invention discloses a preparation method of a disodium hydrogen phosphate heat storage system suitable for greenhouses. The pure disodium hydrogen phosphate dodecahydrate (Na2HPO4.12H2O), of which the melting point is 35.5 DEG C, can not be directly used for greenhouses as a heat storage material. The method comprises the following steps: by using Na2HPO4.12H2O as a heat storage medium, adding KCl to lower the melting point to 25 DEG C or so, and adding a nucleator graphite and a thickener sodium silicate into the heat storage matrix to prepare the phase-change heat storage material with stable performance. The phase-change temperature of the disodium hydrogen phosphate heat storage system is 22-25 DEG C or so, and the latent heat density is 180.2 J / g. The disodium hydrogen phosphate heat storage system has the characteristics of proper phase-change temperature, high phase-change latent heat value, small volume expansion rate, no degree of supercooling and the like, and is a favorable inorganic salt heat storage material for greenhouse production.

Description

technical field [0001] The invention belongs to the technical field of agricultural engineering, and relates to a disodium hydrogen phosphate heat storage system, in particular to reducing the phase transition temperature of disodium hydrogen phosphate by adding low-melting salt and cooling the heat storage matrix by adding a nucleating agent and a thickener method of elimination. Background technique [0002] The heat source in the energy-saving solar greenhouse mainly depends on solar radiation. During the day, the sunlight shines on the wall and the ground through the transparent covering material, and the air temperature and the ground temperature are raised due to the greenhouse effect. maintained at a relatively high temperature. It can be seen that the heat accumulator and heat release body in the greenhouse play a key role in maintaining the stability of the indoor temperature in the greenhouse at night. Therefore, the heat storage and release capacity of the heat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 许红军于辉张振国吴慧秦勇陈青云
Owner XINJIANG AGRI UNIV
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