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Thermoelectric energy storage system having an internal heat exchanger and method for storing thermoelectric energy

An energy storage system and heat exchanger technology, applied in the field of electrical energy storage, can solve problems such as lowering the temperature level and reducing the ability to do thermal work, and achieve the effect of maximizing cycle efficiency and high cycle efficiency

Inactive Publication Date: 2012-07-11
ABB RES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This situation inevitably reduces the temperature level and thus the ability of heat to do work

Method used

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  • Thermoelectric energy storage system having an internal heat exchanger and method for storing thermoelectric energy
  • Thermoelectric energy storage system having an internal heat exchanger and method for storing thermoelectric energy
  • Thermoelectric energy storage system having an internal heat exchanger and method for storing thermoelectric energy

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Embodiment Construction

[0042] figure 2 and 3 The filling circulation system and the discharge circulation system of the TEES system according to an embodiment of the present invention are schematically depicted respectively.

[0043] figure 2 The charging cycle system 10 shown in FIG. 2 includes a power recovery expander 12 , an evaporator 14 , a compressor 16 , a high temperature heat exchanger 18 and an internal heat exchanger 20 . The working fluid is circulated through these components, as by figure 2 Indicated by the solid line with the arrow. Notably, both the output from the evaporator 14 and the output from the high temperature heat exchanger 18 pass through the internal heat exchanger 20 . Furthermore, a cold storage tank 22 and a hot storage tank 24 containing a liquid heat storage medium are coupled together through a heat exchanger 18 . Thermal storage liquid flows between the cold storage tank 22 and the hot storage tank 24, as indicated by the dashed arrowed lines.

[0044] In...

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Abstract

A thermoelectric energy storage system (TEES) and method for converting electrical energy into thermal energy to be stored and converted back to electrical energy with an improved round-trip efficiency are disclosed. The TEES comprises a working fluid circuit for circulating a working fluid through a first heat exchanger (18) and a second heat exchanger (20), a thermal storage medium circuit for circulating a thermal storage medium, the thermal storage medium circuit having at least one hot storage tank (24) coupled to a cold storage tank (22) via the first heat exchanger (18). The arrangement maximises the work performed by the cycle during charging and discharging for a given maximum pressure and maximum temperature of the working fluid. Advantageously, this maximises the round-trip efficiency of the system.

Description

technical field [0001] The present invention generally relates to storage of electrical energy. It relates in particular to a system and method for storing electrical energy in the form of heat in a thermal energy store. Background technique [0002] Base load generators such as nuclear power plants and generators with random intermittent energy sources such as wind turbines and solar panels generate excess electrical power during times of low power demand. Large scale electrical energy storage systems are the way to divert this excess energy to times of peak demand, and balance overall power generation and consumption. [0003] In an earlier patent application EP1577548 the applicant has described the idea of ​​a thermoelectric energy storage (TEES) system. TEES converts excess electricity into heat during the filling cycle, stores that heat, and converts that heat back to electricity when needed during the discharge cycle. This energy storage system is robust, compact, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01K3/12F01K11/04F24H7/02F01K3/00
CPCF01K3/12F01K11/04F01K3/006
Inventor M·默坎格茨J·黑姆尔勒L·考夫曼
Owner ABB RES LTD
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