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Composite phase change energy storage material and preparation method thereof

A technology of energy storage materials and composite phase change, applied in the field of energy storage materials, can solve problems such as unstable heat transfer, and achieve the effects of increasing overall stability, eliminating crystal deposition, and prolonging heat release time.

Inactive Publication Date: 2017-12-08
北京华厚能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The phase transition temperature of sodium acetate is suitable for household use, but due to its unstable heat transfer, at the set temperature, sodium acetate will form from solid to solid-liquid mixed state of sodium acetate and from molten state to solid state. Life cycle solids that are irreversibly stored at the bottom of the PCM container

Method used

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  • Composite phase change energy storage material and preparation method thereof
  • Composite phase change energy storage material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Weigh 100kg of sodium acetate trihydrate and 1.5kg of zinc acetate, heat and melt until the solution maintains a temperature of 65°C, then stir in the reaction vessel at a rate of 2500rpm, and add 1.11kg with a density of 1.4-1.5g / cm 3 The pre-mixture of foamed copper powder, 1.11kg carboxymethyl cellulose and 0.33kg of hydrophilic fumed silica was added in about half an hour, continued to stir for 1 hour, placed in a heat exchanger, left to cool, and obtained Mixed homogeneous phase change energy storage materials. The measured enthalpy value of a composite phase change energy storage material is 312kJ / kg, and the thermal conductivity is 0.7W / m·K.

Embodiment 2

[0028] Weigh 100kg of sodium acetate trihydrate and 1.67kg of zinc acetate, heat and melt until the solution maintains a temperature of 65°C, then stir in the reaction vessel at a rate of 2000rpm, and add 2.22kg with a density of 14-1.5g / cm 3 The pre-mixture of foamed copper powder, 1.11kg carboxymethyl cellulose and 0.55kg of hydrophilic fumed silica was added in about half an hour, continued to stir for 1 hour, placed in a heat exchanger, left to cool, and obtained Mixed homogeneous phase change energy storage materials. The measured enthalpy value of a composite phase change energy storage material is 292kJ / kg, and the thermal conductivity is 0.9W / m·K.

Embodiment 3

[0030] Weigh 100kg of sodium acetate trihydrate and 2.22kg of zinc acetate, heat and melt until the solution maintains a temperature of 65°C, and then stir in the reaction vessel at a rate of 3000rpm, while adding 3.33kg with a density of 1.4-1.5g / cm 3 The pre-mixture of foamed copper powder, 0.85kg carboxymethyl cellulose and 0.33kg of hydrophilic fumed silica was added in about half an hour, continued to stir for 1 hour, placed in a heat exchanger, and left to cool to obtain Mixed homogeneous phase change energy storage materials. The measured enthalpy value of a composite phase change energy storage material is 286kJ / kg, and the thermal conductivity is 1.2W / m·K.

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Abstract

The invention discloses a composite phase change energy storage material and a preparation method thereof. The composite phase change energy storage material comprises the following components in percentage by mass: 86-95.5% of a main body material, 2.5-9% of a suspending agent, 1-2% of a nucleating agent and 1-5% of a heat-conducting enhancer. By selecting the proper material and aid proportion, the phase separation and supercooling degree degrees of the material are effectively reduced, and the material is applicable to various heat exchangers. Particularly, the heat-conducting enhancer is added into the system, so that the heat-conducting property of the material is improved by 3-4 times, the heat-conducting property of the system is realized, the stability of the system is realized, and the composite phase change energy storage material has the advantages of rich raw materials, low price, high energy storage density, low in corrosive property and the like.

Description

technical field [0001] The invention relates to the field of energy storage materials, more specifically, to a composite phase change energy storage material and a preparation method thereof. Background technique [0002] In recent years, heat storage energy storage technology has been widely used in the fields of renewable energy utilization and energy saving and consumption reduction. Energy storage technology has become a strategic issue for energy security and sustainable development. Among many energy storage methods, the latent heat energy storage method of solid-liquid phase change materials is widely used in air conditioning energy saving, solar energy utilization, thermal design of electronic equipment, and building energy saving due to its high latent heat, high density and relatively constant phase transition temperature. and other fields. [0003] There are many heating and cooling systems on the market, many of which rely on fossil fuels. With the growing supp...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 贾维孟帅
Owner 北京华厚能源科技有限公司
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