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Phase transformation heat accumulating material

A technology of phase change heat storage and raw materials, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of overcooling, low phase change heat, precipitation, etc., and achieve stable performance, low corrosion, and abundant sources Effect

Active Publication Date: 2008-05-28
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic phase change thermal storage materials are stable in properties, but have low phase change heat; inorganic crystalline hydrated salt phase change materials have large phase change heat, but have defects of supercooling and precipitation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The phase-change heat storage material is composed of the following raw materials in mass ratio: sodium acetate trihydrate, 96.8 parts; carboxymethyl cellulose, 1.7 parts; magnesium chloride hexahydrate, 1.0 parts; sodium carboxymethyl cellulose, 0.5 parts; Nano carbon powder, 3ppm parts.

[0023] Grind all ingredients thoroughly in a mortar. The phase change temperature of the obtained phase change heat storage material is 54.7°C, the degree of supercooling is 3°C, and the heat of phase change is 316MJ / m 3 , The thermal conductivity is 1.0W / m·k.

Embodiment 2

[0025] The composition of the phase change heat storage material is basically the same as in Example 1, except that the amount of the nano-carbon powder in the raw material is doubled, that is, 6 ppm, and the other compositions are unchanged, and the obtained phase change heat storage material has a phase The transition temperature is 56.5°C, the degree of supercooling is 4°C, the heat of phase transition is 304MJ / m3, and the thermal conductivity is 1.2W / m·k.

Embodiment 3

[0027] Phase change heat storage material, which consists of the following compounds in mass ratio:

[0028] Sodium acetate trihydrate, 95.0 parts; Carboxymethyl cellulose, 1.4 parts; Magnesium chloride hexahydrate, 2.8 parts; Sodium carboxymethyl cellulose, 0.8 parts. Grind all ingredients thoroughly in a mortar. The obtained phase change material has a phase transition temperature of 58.1°C, an undercooling degree of 5°C, and a phase transition heat of 290MJ / m 3 , The thermal conductivity is 0.82W / m·k.

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Abstract

The invention discloses a phase change thermal storage material which is composed of substance according to mass ratio of 85-98 parts of trihydrate sodium acetate, 1-10 parts of carboxymethyl cellulose, 0.5-3.5 parts of hexahydrate magnesium chloride, 0.1-2.5 parts of sodium carboxymethyl cellulose, and 0-10ppm parts of nanophase powdered carbon. Raw materials of the phase change thermal storage material have rich supply and low cost. The phase change thermal storage is large (larger than 280MJ / m3), the thermal coefficient is large (larger than 0.8W / m,k),and the phase change temperature is 54-60 DEG C, thereby favoring recycle of condenser heat of air conditioners and other waste heat recovery field. The condenser depression is relatively small (3 DEG C-5 DEG C), which greatly favors releasing of required heat.

Description

technical field [0001] The invention belongs to heat storage technology, in particular to a phase change heat storage material. Background technique [0002] Heat storage technology is widely used. It can not only adjust energy supply and demand, shift peaks and fill valleys, balance energy systems, but also reduce energy consumption, save operating costs, and achieve efficient and reasonable use of energy. [0003] At present, air conditioners are widely used, but they also consume a lot of power. If the heat of the air-conditioning condenser can be recycled, the energy efficiency ratio of the air-conditioning system will be greatly improved. Through energy storage, the overall energy consumption of the air conditioner can be reduced. Moreover, for domestic, commercial and industrial air conditioner users, this can greatly reduce the energy required to produce hot water, thereby achieving a high degree of energy saving. [0004] One of the most effective ways to use the ...

Claims

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Application Information

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IPC IPC(8): C09K5/02
Inventor 梁德青石海民李栋梁杨向阳
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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