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Thermal energy storage and recovery with a heat exchanger arrangement having an extended thermal interaction region

a heat exchanger and thermal interaction technology, applied in the direction of indirect heat exchangers, machines/engines, lighting and heating apparatus, etc., can solve the problems of complex mechanical arrangement of system components and known system inflexibility, and achieve the effect of increasing the efficiency of the described thermal energy storage, efficient heat generation, and high efficiency of the heat generation arrangemen

Inactive Publication Date: 2013-05-02
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0042]According to an embodiment of the invention the heat generating arrangement comprises (a) a compressor for feeding the thermal energy storage and recovery device with compressed hot heat transfer medium and (b) a turbine for receiving from the thermal energy storage and recovery device cooled down heat transfer medium. This may provide the advantage that any gas such as for instance compressed air can be used as the heat transfer medium for loading the thermal energy storage and recovery device with thermal energy. Since the thermal energy storage and recovery device will cool down the air during its passage through the heat exchanger arrangement of the thermal energy storage and recovery device, the air pressure at the outlet of the thermal energy storage and recovery device will be smaller than the pressure of the compressed air at the input of the thermal energy storage and recovery device.
[0043]According to a further embodiment of the invention the heat generating arrangement further comprises a motor driving the compressor. Thereby, the turbine is mechanically connected to the motor. This may provide the advantage that a high efficiency of the heat generating arrangement can be achieved.
[0044]Specifically, if the hot heat transfer medium or fluid comprises a hot compressed air as an inlet to the heat exchanger arrangement in the thermal energy storage and recovery device then a cooled compressed air may be returned at the outlet of the heat exchanger arrangement, wherein the cooled compressed air may be fed into an air-turbine which may be mechanically connected to a shaft being common for the air-turbine

Problems solved by technology

One disadvantage of this wind-powered energy production and storing system is that there is a direct mechanical connection between the energy storage and recovery system and the wind turbine and that all th

Method used

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  • Thermal energy storage and recovery with a heat exchanger arrangement having an extended thermal interaction region
  • Thermal energy storage and recovery with a heat exchanger arrangement having an extended thermal interaction region
  • Thermal energy storage and recovery with a heat exchanger arrangement having an extended thermal interaction region

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first embodiment

[0089]FIG. 4 shows a schematic illustration of a thermal energy storage and recovery system 430 in accordance with the invention. To store energy within a thermal energy storage and recovery device 400 a heat generating arrangement 470 is used. To recover energy from the thermal energy storage and recovery device 400 a heat consumption arrangement 490 is used.

[0090]As can be seen from FIG. 4, the heat generating arrangement 470 comprises a compressor 472, which is driven be a motor 476. The compressor 472 comprises an air inlet 472a. The air in the air inlet 472a may have a temperature of e.g. 20 Celsius degrees and a pressure of e.g. 1 bar. During compression of the air the pressure may rise to e.g. 25 bar and the temperature may rise to e.g. 500 Celsius degrees. This heated up and compressed air is fed into an inlet of a heat exchanger arrangement 410 of the thermal energy storage and recovery device 400. The compressed air then returns via an outlet of the heat exchanger arrangem...

second embodiment

[0098]FIG. 5 shows a schematic illustration of a thermal energy storage and recovery system 530 in accordance with the invention. In this embodiment, a district heating installation or a thermal power generation plant 535 is connected to a utility grid 550 and to a thermal energy storage and recovery device 500. According to the embodiment described here the district heating installation or power generation plant 535 comprises a steam turbine 540 with a condenser (not shown) and a connected electrical power generator 545 and a compressor 572 with a built in motor. The compressor 572 may be replaced by an electrical boiler or may be supplemented by means of a heat pump system or other heating means.

[0099]The district heating installation or thermal power generation plant 535 is connected to the thermal energy storage and recovery device 500 both for energy storage and for recovering of stored energy. Also here a wind turbine 560 or other kind of alternative energy resources may be co...

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Abstract

A thermal energy storage and recovery device includes a heat exchanger arrangement for guiding a flow of a heat transfer medium between first and second ends thereof, and a heat storage material surrounding it, forming thermal interaction region between the heat transfer medium and the heat storage material. The heat exchanger arrangement transports the heat transfer medium from the first end to the second end when the heat storage material receives thermal energy from the heat transfer medium, and transports the heat transfer medium from the second end to the first end when the heat storage material releases thermal energy to the heat transfer medium. A controller operates the device such that that when storing or recovering thermal energy to or from the heat transfer medium within the device there exists a region where the inlet and outlet temperature of the heat transfer medium of this region is kept constant.

Description

FIELD OF INVENTION[0001]The present invention relates to the field of temporarily storing thermal energy. In particular, the present invention relates to a thermal energy storage and recovery device comprising a heat exchanger arrangement and a heat storage material. Further, the present invention relates to a thermal energy storage and recovery system comprising such a thermal energy storage and recovery device and to a method for storing and recovering thermal energy with such a thermal energy storage and recovery device.ART BACKGROUND[0002]The production of electric power from various types of alternative energy sources such as for instance wind turbines, solar power plants and wave energy plants is not continuous. The production may be dependent on environmental parameters such as for instance wind speed (for wind turbines), sunshine intensity (for solar power plant) and wave height and direction (for wave energy plants). There is very often little or no correlation between ener...

Claims

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Application Information

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IPC IPC(8): F28D17/04F01K3/00
CPCF02C6/14F05D2220/72F05D2220/76F28D20/00Y02E60/142F28F27/02F01K3/00F28D17/04Y02E20/14F28D20/0056Y02E60/14
Inventor STIESDAL, HENRIK
Owner SIEMENS AG
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