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Nano solid-liquid phase change energy storage composite material

A nanocomposite, solid-liquid phase change technology, applied in the field of phase change energy storage, can solve the problems of large subcooling and application limitations, and achieve the effects of eliminating supercooling, good heat transfer performance, and increasing viscosity

Inactive Publication Date: 2011-03-02
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hydrated inorganic salt phase change materials have the disadvantages of large undercooling and easy precipitation of inorganic salt crystals and phase separation, which greatly restricts its application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 92 parts of sodium acetate hydrate, 4 parts of nano-aluminum nitride powder, and 4 parts of thickener sodium carboxymethyl cellulose. After mixing the three, fully grind and mix them in a solid state, fill them into a container for compaction, and heat Packaged after melting. The nanocomposite hydrated sodium acetate phase-change material obtained with the above proportion has a phase-change latent heat of more than 200kJ / kg, a phase-change temperature of more than 50°C, and an undercooling degree of less than 2°C.

Embodiment 2

[0026] Weigh 91 parts of sodium acetate hydrate, 5 parts of nano-aluminum nitride powder, and 4 parts of thickener sodium carboxymethyl cellulose. After mixing the three, fully grind and mix them in a solid state, fill them into a container for compaction, and heat Packaged after melting. The nanocomposite hydrated sodium acetate phase change material obtained with the above proportion has a phase change latent heat greater than 200kJ / kg, a phase change temperature higher than 50°C, and no supercooling.

Embodiment 3

[0028] Weigh 92 parts of sodium sulfate hydrate, 5 parts of nano aluminum nitride powder, 3 parts of thickener sodium carboxymethyl cellulose, heat and melt sodium sulfate hydrate, add nano aluminum nitride powder, fully stir and oscillate, and disperse evenly Finally, the thickener sodium carboxymethyl cellulose is added, mixed evenly, and finally filled into a container for packaging. The nanocomposite hydrated sodium sulfate phase change material obtained with the above proportion has a phase change latent heat greater than 200kJ / kg, a phase change temperature of about 30°C, and an undercooling degree of less than 2°C.

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PUM

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Abstract

The invention relates to a nano solid-liquid phase change energy storage composite material, belonging to a phase change energy storage technology. The composite material comprises the following components in parts by weight: 88 to 98 parts of hydrated salt, 1 to 7 parts of a nano material and 1 to 5 parts of thickener. With regard to the nano solid-liquid phase change energy storage composite material, the hydrated salt is taken as a main body for phase change energy storage, thus having higher energy storage density and good heat transfer performance; the nano material is taken as nucleating agent, thereby reducing and even eliminating the degree of supercooling of the hydrated salt and having stable property and corrosion resistance; and a proper amount of the thickener is added to increase the viscosity of liquid hydrated salt, thereby preventing the phase separation of the hydrated salt and simultaneously strengthening the suspension stability of the nano material. The nano solid-liquid phase change energy storage composite material of the invention can be widely applied to the fields of solar thermal utilization, industrial waste heat recovery, air conditioning energy storage and the like.

Description

technical field [0001] The invention belongs to the phase change energy storage technology, in particular to a solid-liquid phase change energy storage material. Background technique [0002] Energy storage technology has a very wide range of applications. For example, in solar thermal utilization, the received solar energy can be stored for use at night or in rainy weather, so as to improve the instability of solar energy and make the energy supply system run stably; in distributed energy systems, energy storage technology can be used to The waste heat of the gas turbine is stored to provide users with hot water or a driving heat source for the absorption air-conditioning system to adjust the matching between the energy supply system and the user's energy load; in the air-conditioning system, energy storage technology can be used to convert cold or heat energy It is stored during low power consumption periods, and then supplied to users during peak power consumption times,...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 胡芃卢大杰张谦
Owner UNIV OF SCI & TECH OF CHINA
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