Organism/expansion graphite composite phase transformation heat storaging material and preparation process and heat storing apparatus thereof

A technology of expanded graphite and composite phase change, applied in heat exchange materials, chemical instruments and methods, cooling/ventilation/heating transformation, etc., to achieve the effects of insignificant volume change, high thermal conductivity, and fast heat transfer rate

Inactive Publication Date: 2007-07-18
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide an organic/expanded graphite composite phase change heat storage material with high heat storage density, high therm

Method used

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  • Organism/expansion graphite composite phase transformation heat storaging material and preparation process and heat storing apparatus thereof

Examples

Experimental program
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Example Embodiment

[0026] Example 1

[0027] Use linear alkanes C 40 H 82 It is a phase change material with a phase change temperature of 62°C, a phase change latent heat of 192kJ / kg, and a thermal conductivity of 0.23W / m.K.

[0028] The acidified graphite is placed in a muffle furnace at a temperature of 800° C. and expanded for 40 seconds to prepare expanded graphite. Put 4g of the above organic phase change heat storage material and 6g of expanded graphite in a 75℃ oven for blending and adsorption for 1 hour to prepare an organic matter / expanded graphite composite phase change heat storage material. The mass percentage of organic matter in the composite phase change heat storage material The content is 40%. The phase change temperature of the composite phase change heat storage material is 62° C., the phase change latent heat is 76.8 kJ / kg, and the thermal conductivity is 4.52 W / m.K.

[0029] As shown in Figure 1, a 200×150×100mm (length×width×height) copper plate (thickness 2mm) is processed in...

Example Embodiment

[0030] Example 2

[0031] Use linear alkanes C 30 H 62 It is a phase change material with a phase change temperature of 60°C, a phase change latent heat of 190kJ / kg, and a thermal conductivity of 0.24W / m.K.

[0032] The acidified graphite is placed in a muffle furnace at a temperature of 900° C. and expanded for 30 seconds to prepare expanded graphite. Put 6g of the above-mentioned organic phase change heat storage material and 4g of expanded graphite in an 85℃ oven for blending and adsorption for 2 hours to prepare an organic matter / expanded graphite composite phase change heat storage material. The mass percentage of organic matter in the composite phase change heat storage material The content is 60%. The phase change temperature of the composite phase change heat storage material is 60°C, the phase change latent heat is 114kJ / kg, and the thermal conductivity is 2.26W / m.K.

[0033] As shown in Figure 1, a 200×150×100mm (length×width×height) copper plate (thickness 2mm) is proce...

Example Embodiment

[0034] Example 3

[0035] Use straight chain alkanes as C 60 H 122 It is a phase change material with a phase change temperature of 71°C, a phase change latent heat of 200kJ / kg, and a thermal conductivity of 0.24W / m.K.

[0036] The acidified graphite is placed in a muffle furnace at a temperature of 1000° C. and expanded for 20 seconds to prepare expanded graphite. 9g of the above organic phase change heat storage material and 1g of expanded graphite were placed in an 85℃ oven for blending and adsorption for 4 hours to prepare an organic matter / expanded graphite composite phase change heat storage material. The mass percentage of organic matter in the composite phase change heat storage material The content is 90%. The phase change temperature of the composite phase change heat storage material is 71° C., the phase change latent heat is 180 kJ / kg, and the thermal conductivity is 1.24 W / m.K.

[0037] As shown in Figure 1, a 200×150×100mm (length×width×height) copper plate (thicknes...

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Abstract

The present invention discloses composite phase change heat storage organic matter/expandable graphite material and its preparation process and corresponding heat storage device. Of the composite material, the organic matter absorbed into the micropores of the expandable graphite accounts for 40-90 wt%, and is saturated fatty acid or linear paraffin as the phase change heat storage material with phase change temperature of 60-75 deg.c, phase change latent heat of 70-180 J/g and heat conductivity coefficient of 1.12-4.52 W/m.K. The heat storage device is one container, which is made of high heat conductivity metal material, has filled and sealed composite phase change heat storage organic matter/expandable graphite material, and is provided with metal fins. The device is used to cool electronic element fast.

Description

technical field [0001] The invention relates to a phase-change heat storage material, in particular to an organic matter / expanded graphite composite phase-change heat storage material and a preparation method thereof, and a phase-change heat storage device for heat dissipation and cooling of electronic devices. Background technique [0002] With the high integration and miniaturization of electronic components, the heating power per unit area continues to increase, and the temperature of electronic components also continues to rise. For most electronic components, the maximum allowable operating temperature is in the range of 100-120°C. Mithal's research results show that if the temperature of electronic components is reduced by 1°C, the failure rate can be reduced by 4%; if the temperature is increased by 10-20°C, the failure rate will increase by 100%. The survey report of the U.S. Air Force shows that more than 55% of failures are caused by overheating of electronic equi...

Claims

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Application Information

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IPC IPC(8): C09K5/06H05K7/20
Inventor 方晓明张正国高学农
Owner SOUTH CHINA UNIV OF TECH
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