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
First Claim
1. A latent heat storage material, comprising:
- a phase-change material having incorporated particles of graphite;
at least a part of said graphite being made up of flakes having a high anisotropy of thermal conductivity and a high aspect ratio and being formed of at least one material selected from the group consisting of natural graphite and anisotropic synthetic graphite, said graphite flakes having a volume content in the latent heat storage material of between 10 and 40%.
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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.
26 Citations
23 Claims
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1. A latent heat storage material, comprising:
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a phase-change material having incorporated particles of graphite; at least a part of said graphite being made up of flakes having a high anisotropy of thermal conductivity and a high aspect ratio and being formed of at least one material selected from the group consisting of natural graphite and anisotropic synthetic graphite, said graphite flakes having a volume content in the latent heat storage material of between 10 and 40%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification