Latent heat storage material, latent heat storage unit containing the material, processes for producing the material and the unit and processes for using the material
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United States of America Patent
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Jun 26, 2007
Grant Date -
Nov 24, 2005
app pub date -
May 12, 2005
filing date -
May 18, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A latent heat storage material is in the form of a composite material formed of a phase-change material to store latent heat and graphite flakes incorporated therein to improve thermal conductivity. The graphite flakes are distinguished by a high aspect ratio and a high anisotropy of thermal conductivity. The volume content of graphite flakes in the latent heat storage material is between 10 and 40%. The composite material can be obtained by mixing the components or infiltrating a bed containing graphite flakes with a liquid phase-change material. The graphite flakes are preferably aligned during mixing with the phase-change material by shaking or tamping, etc., so that the thermal conductivity in the direction that is advantageous for the individual application is maximized. A latent heat storage unit containing the material and processes for producing the material and the unit and processes for using the material, are also provided.
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