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Method and apparatus for storing and releasing heat by means of a phase change material

A phase change material and heat storage technology, applied in heat storage equipment, heat storage heaters, fluid heaters, etc., can solve problems such as high costs, achieve the effect of eliminating temperature restrictions and reducing costs

Inactive Publication Date: 2012-11-28
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] It has proven disadvantageous in these known devices with immobile phase-change materials that, because commonly used phase-change materials are corrosive, a large amount of expensive material, such as stainless steel, is required for the construction of the heat exchanger and, as a result, expensive the cost of

Method used

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  • Method and apparatus for storing and releasing heat by means of a phase change material
  • Method and apparatus for storing and releasing heat by means of a phase change material

Examples

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Embodiment Construction

[0060] according to figure 1 The first embodiment of the device comprises a first storage tank 1 filled with a liquid thermal storage medium. The first storage tank 1 is thermally insulated so that only a slight heat exchange with the environment takes place. The heat storage medium is made of phase change material NaNO 3 constitute.

[0061] When the heat storage medium is accumulated in the storage tank 1, the temperature of the heat storage medium is higher than the melting point of the heat storage medium, that is, higher than 308° C. in this case.

[0062] figure 1 The shown arrangement also includes a first heat exchanger 2 which is in flow communication with the storage tank 1 via a line 2a. The heat exchanger 2 comprises a screw conveyor in which a rotatably mounted conveying screw driven by a motor is arranged in a cylindrical housing. The shaft of the conveying screw is in the form of a hollow cylinder and communicated with the heat transfer fluid circuit. Pipe...

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PUM

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Abstract

The invention relates to a method for storing and releasing heat by means of a phase change material. In said method, a phase change is caused in a first heat exchanging device (4) by supplying heat during a charging process in a storage medium comprising a phase change material in order to store the heat as latent heat in the storage medium, and a phase change is caused in the storage medium while heat is dissipated during a discharging process in the first or another heat exchanging device (2). The invention is characterized in that at least predominantly non-encapsulated phase change material is used as storage medium, the storage medium is fed to the first heat exchanging device (4) as a fluid stream or particle stream during the charging process and is discharged when the phase change has been completed, the storage medium is fed to the first or another heat exchanging device (2) as a fluid stream during the discharging process and is discharged from the heat exchanging device as a fluid stream or particle stream when the phase change has been completed, the storage medium is temporarily stored in a first storage tank (1) following the charging process and / or in the first or another storage tank (3) following the discharging process,; and the storage medium is actively conveyed and heat is exchanged during the phase change as the charging process and / or the discharging process take / s place. The invention further relates to an apparatus for storing and releasing heat by means of a phase change material.

Description

technical field [0001] The invention relates to a method of heat storage and release using phase change materials according to the preamble of claim 1 and such a device according to the preamble of claim 11 . Background technique [0002] Thermal storage is necessary or advantageous for many technical applications. This relates, for example, to the use of renewable energy in solar power plants and to cyclical processes, where the efficiency obtained by accumulating waste heat in one cycle is increased for use in the next cycle. [0003] Heat accumulators are particularly suitable for efficient heat or cold storage, the heat accumulators contain a phase change material (Phase change Material, PCM) as heat storage medium. Such a latent heat accumulator has the following advantage over other accumulators: it can store a large amount of heat within a narrow temperature range. Compared to conventional sensible heat accumulators, latent heat accumulators can be used to achieve h...

Claims

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Application Information

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IPC IPC(8): F28D20/02
CPCF28D2020/006Y02E60/145F28D15/0266F28D20/02F24H7/00Y02E60/14
Inventor 安顿·诺伊豪斯尔皮特·尼茨沃纳·普拉策尔
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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