Latent heat storage material and preparation method of the latent heat storage material

A technology of latent heat storage and phase change materials, applied in heat exchange materials, chemical instruments and methods, lighting and heating equipment, etc., can solve problems such as impossible storage of solar heat

Inactive Publication Date: 2008-10-22
SGL CARBON SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is impossible to store solar heat

Method used

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  • Latent heat storage material and preparation method of the latent heat storage material
  • Latent heat storage material and preparation method of the latent heat storage material
  • Latent heat storage material and preparation method of the latent heat storage material

Examples

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Embodiment 1

[0033] In one embodiment, sodium acetate trihydrate (melting temperature 58° C.) in powder form is mixed with expanded graphite foil by pulverizing at a mixing ratio of about 85 wt. % to about 15 wt. Graphite powder prepared with 500 micron particles (GFG500). Afterwards, the resulting powder mixture was infiltrated with molten paraffin (RT52) with a melting point of 52° C. supplied by Rubitherm, Hamburg, Germany, and tempered at about 60° C. as image 3 Differential scanning calorimetry (DSC) of the phase change material (PCM) graphite mixture indicated a melting region between the melting point of the paraffin (51.4°C) and that of sodium acetate trihydrate (59.44°C), as shown. The harvested latent heat storage material had a graphite content of about 8.5% by weight.

Embodiment 2

[0034] In another embodiment, the same material as in Example 1 was mixed in a mixing ratio of about 75% by weight to about 25% by weight and impregnated with molten paraffin (RT52). In this embodiment, the harvested latent heat storage material has a graphite content of about 7.7% by weight. Figure 4 Results are shown for two separate melting steps over several heating / cooling cycles.

Embodiment 3

[0035] For comparison with the previously described examples, in this embodiment a mixture of expanded graphite (20% by weight) and two miscible salts, potassium nitrate (KNO 3 ) (43% by weight) and sodium nitrate (NaNO 3 ) (37% by weight) mixture to produce latent heat storage composites. KNO 3 has a melting point of 337°C and NaNO 3 The melting point is 307°C. In a laboratory mixer, mix the expanded graphite with solid NaNO 3 powder. In expanded graphite and NaNO 3 The powder mixture was cast on molten KNO at a temperature of about 345 °C 3 . The salt-graphite mixture was cooled to room temperature and the melting temperature of the resulting composite was determined by DSC. This latent heat storage composite has a unique melting point of 220°C rather than phase transitioning over a temperature range as demonstrated in Example 1 using a phase change material that is immiscible.

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Abstract

The invention relates to a latent heat storage material comprising a first phase change material, at least one second phase change material different from the first phase change material, and an expanded graphite material wherein the first phase change material and the at least one second phase change material are intermixed and the latent heat storage material exhibits a phase transition over a range of temperatures. The invention also relates to a process for the preparation of a latent heat storage material comprising combining a mixture of an expanded graphite material and a first phase change material with at least one different second phase change material.

Description

technical field [0001] A latent heat storage material and a preparation method of the latent heat storage material. More specifically, a mixture of expanded graphite material and a first phase change material is treated with at least one second phase change material, wherein the first and second phase change materials are mutually immiscible, thereby forming a latent heat storage material. Background technique [0002] Phase change materials (PCMs) store thermal energy in the form of latent heat. When heat is applied or removed, this material undergoes a phase transition, such as from solid to liquid (melting) or from liquid to solid (hardening), or between low and high temperature modification or hydration and dehydration modification. between properties or between different liquid modifications. If heat is applied or removed from a phase change material, once the phase change point is reached, the temperature remains constant until the material is completely transformed....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063Y10T428/30F25D2303/085
Inventor M·克里斯特O·厄廷格J·巴赫尔
Owner SGL CARBON SE
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