| Description |
1 online resource (11 pages) : color illustrations. |
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text txt rdacontent |
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computer c rdamedia |
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online resource cr rdacarrier |
| Series |
NREL/CP ; 5500-74753 |
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Conference paper (National Renewable Energy Laboratory (U.S.)) ; 5500-74753.
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| Note |
Presented at the 2019 Solar Power and Chemical Energy Systems Conference (SolarPACES), 1-4 October 2019, Daegu, South Korea. |
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"September 2019." |
| Bibliography |
Includes bibliographical references. |
| Funding |
Contract No. DE-AC36-08GO28308. |
| Note |
Description based on online resource; title from PDF title page (NREL, viewed on July 30, 2020). |
| Summary |
Pumped Thermal Electricity Storage (PTES) is an energy storage device that uses grid electricity to drive a heat pump to generate hot and cold storage reservoirs. This thermal potential is later used to power a heat engine and return electricity to the grid. In this article, a PTES variant that uses supercritical carbon dioxide (sCO2) as the working fluid is introduced. sCO2-PTES cycles have higher work ratios and power densities than the systems based on ideal gases that have been investigated to date. Furthermore, sCO2-PTES cycles may achieve higher round-trip efficiencies for a given hot storage temperature (up to 78% at 560 degrees C). The sensitivity of PTES cycles to loss factors such as isentropic efficiencies and temperature differences between the power cycle and storage fluid is investigated. A second concept whereby an sCO2-PTES cycle is integrated with concentrating solar power (CSP) is introduced. This concept 'time-shifts' the recompression of an sCO2 recompression cycle to a period of lower electricity prices and stores the heat. When solar heat is dispatched, the recompressor may be avoided as the required heat is obtained from storage, thereby leading to increased heat engine efficiencies. The net work output of this integrated system is 10-18% greater than the conventional recompression cycle. Combining PTES with a CSP power cycle is therefore shown to improve the dispatch of solar heat as well as providing electricity storage services. |
| Subject |
Energy storage.
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Atmospheric carbon dioxide.
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Énergie -- Stockage.
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Gaz carbonique atmosphérique.
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Atmospheric carbon dioxide (OCoLC)fst00820368
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Energy storage (OCoLC)fst00910245
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| Indexed Term |
concentrating |
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electricity |
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power |
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PTES |
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pumped |
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SCO2 |
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solar |
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storage |
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thermal |
| Added Author |
McTigue, Joshua, author.
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National Renewable Energy Laboratory (U.S.), issuing body.
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| Standard No. |
1570183 OSTI ID |
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0000-0003-3736-2788 |
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0000-0003-1507-3563 |
| Gpo Item No. |
0430-P-04 (online) |
| Sudoc No. |
E 9.17:NREL/CP 5500-74753 |
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