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Thermoelectric energy storage system and method for storing thermoelectric energy

A storage system, electric energy technology, applied in thermal storage heaters, fluid heaters, lighting and heating equipment, etc., can solve the problems of high capital cost and impracticality

Active Publication Date: 2011-07-20
ABB (SCHWEIZ) AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem is that these technical solutions lead to high capital costs and are therefore generally impractical

Method used

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  • Thermoelectric energy storage system and method for storing thermoelectric energy
  • Thermoelectric energy storage system and method for storing thermoelectric energy
  • Thermoelectric energy storage system and method for storing thermoelectric energy

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Embodiment Construction

[0033] figure 2 and 3 A charge cycle system and a discharge cycle system of the TEES system according to an embodiment of the present invention are schematically depicted, respectively.

[0034] exist figure 2 The charging cycle system 22 shown in FIG. 2 includes a work recovery expander 24 , an evaporator 26 , a compressor 28 and a heat exchanger 30 . working fluid such as figure 2The solid lines with arrows in , cycle through these components indicatively. Additionally, a cold fluid storage tank 32 and a hot fluid storage tank 34 containing a fluid thermal storage medium are coupled together by a heat exchanger.

[0035] In operation, the charging cycle system 22 performs a transcritical cycle and the working fluid flows around the TEES system in the following manner. The working fluid in the evaporator 26 absorbs heat from the environment or from cold storage and evaporates. The vaporized working fluid is circulated to the compressor 28 and the excess electrical en...

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PUM

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Abstract

A system and method for thermoelectric energy storage is described. A thermoelectric energy storage system (22, 36) having a heat exchanger (30) which contains a thermal storage medium, and a working fluid circuit for circulating a working fluid through the heat exchanger (30) for heat transfer with the thermal storage medium. The working fluid undergoes transcritical cooling during the charging and transcritical heating during the discharging cycle as it exchanges heat with the thermal storage medium. Improved roundtrip efficiency is achieved through minimising the maximum temperature difference (delta Tmax) between the working fluid and the thermal storage medium during operating cycles.

Description

technical field [0001] The present invention generally relates to storage of electrical energy. It particularly relates to systems and methods for storing electrical energy in the form of thermal energy in a thermal energy store. Background technique [0002] Base load generators, such as nuclear power plants, and generators of random, intermittent energy sources, such as wind turbines and solar panels, generate excess power during periods of low power demand. Large scale electrical energy storage systems are devices that divert this excess energy to peak demand periods and balance overall generation and consumption. [0003] In an earlier patent application EP1577548, the applicant described the idea of ​​a thermoelectric energy storage (TEES) system. TEES convert excess electricity into heat during a charging cycle, store the heat, and convert the heat back into electricity when necessary during a discharging cycle. Such energy storage systems are durable, compact, site...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01K3/12F01K11/04F24H7/02F01K3/00
CPCF01K3/12F01K3/006
Inventor J·赫姆尔勒M·默坎戈茨C·奥勒
Owner ABB (SCHWEIZ) AG