A thermo-economic methodology to select sCO2 power cycles for CSP applications

The interest in Supercritical Carbon Dioxide (sCO2) power cycles has grown exponentially in the last decade, thanks to distinctive features like the possibility to achieve high thermal efficiencies at intermediate temperature, small footprint and adaptability to a wide variety of energy sources. In...

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Autores: Crespi, Francesco Maria, Sánchez Martínez, David Tomás, Rodríguez, José María, Gavagnin, Giacomo
Formato: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2020
País:España
Recursos:Universidad de Sevilla (US)
Repositorio:idUS. Depósito de Investigación de la Universidad de Sevilla
OAI Identifier:oai:idus.us.es:11441/183240
Acesso em linha:https://hdl.handle.net/11441/183240
https://doi.org/10.1016/j.renene.2018.08.023
Access Level:acceso abierto
Palavra-chave:sCO2 power cycle
Thermo-economic analysis
CSP power plant
Thermal Energy Storage
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spelling A thermo-economic methodology to select sCO2 power cycles for CSP applicationsCrespi, Francesco MariaSánchez Martínez, David TomásRodríguez, José MaríaGavagnin, GiacomosCO2 power cycleThermo-economic analysisCSP power plantThermal Energy StorageThe interest in Supercritical Carbon Dioxide (sCO2) power cycles has grown exponentially in the last decade, thanks to distinctive features like the possibility to achieve high thermal efficiencies at intermediate temperature, small footprint and adaptability to a wide variety of energy sources. In the present work, the potential of this technology is studied for Concentrated Solar Power applications, in particular Solar Tower systems with Thermal Energy Storage. Further to a previous thorough sensitivity analysis of twelve sCO2 cycles assessing the impact of turbine inlet temperature and pressure ratio on thermal efficiency, specific work, solar share and temperature rise across the solar receiver, the present paper investigates the features of two of these cycles in more detail. The most important conclusions of this section are that: a) the peak values of these thermodynamic figures of merit are obtained at different pressure ratios; b) specific work and temperature rise across the receiver seem to follow parallel trends whilst this is not the case for thermal efficiency; c) for a given turbine inlet temperature, higher pressure ratios increase the temperature rise across the receiver strongly, but the effect on thermal efficiency is uncertain as this can either increase or decrease, depending on the cycle considered. A deeper analysis of thermal efficiency and receiver temperature rise is therefore mandatory, given that these parameters have a very strong effect on the capital cost of CSP power plants. On one hand, a higher thermal efficiency implies a smaller solar field, the largest contributor to the plant capital cost; on the other, the temperature rise across the receiver is inversely proportional to the size of the thermal energy storage systems, as it is also the case for state of the art steam turbine based CSP plants. In order to quantify these trends, an economic analysis is developed using an in-house code and the open-source software System Advisor Model to evaluate the trade-offs between these two effects. As a result, the Overnight Capital Cost is estimated at some 5000 $/kW, with the individual contributions of solar field, thermal energy storage and power block being given in the paper.ElsevierIngeniería Energética2020info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfapplication/pdfhttps://hdl.handle.net/11441/183240https://doi.org/10.1016/j.renene.2018.08.023reponame:idUS. Depósito de Investigación de la Universidad de Sevillainstname:Universidad de Sevilla (US)InglésRenewable Energy, 147, Part 3, 2905-2912.https://www.sciencedirect.com/science/article/abs/pii/S0960148118309741info:eu-repo/semantics/openAccessoai:idus.us.es:11441/1832402026-06-17T12:51:07Z
dc.title.none.fl_str_mv A thermo-economic methodology to select sCO2 power cycles for CSP applications
title A thermo-economic methodology to select sCO2 power cycles for CSP applications
spellingShingle A thermo-economic methodology to select sCO2 power cycles for CSP applications
Crespi, Francesco Maria
sCO2 power cycle
Thermo-economic analysis
CSP power plant
Thermal Energy Storage
title_short A thermo-economic methodology to select sCO2 power cycles for CSP applications
title_full A thermo-economic methodology to select sCO2 power cycles for CSP applications
title_fullStr A thermo-economic methodology to select sCO2 power cycles for CSP applications
title_full_unstemmed A thermo-economic methodology to select sCO2 power cycles for CSP applications
title_sort A thermo-economic methodology to select sCO2 power cycles for CSP applications
dc.creator.none.fl_str_mv Crespi, Francesco Maria
Sánchez Martínez, David Tomás
Rodríguez, José María
Gavagnin, Giacomo
author Crespi, Francesco Maria
author_facet Crespi, Francesco Maria
Sánchez Martínez, David Tomás
Rodríguez, José María
Gavagnin, Giacomo
author_role author
author2 Sánchez Martínez, David Tomás
Rodríguez, José María
Gavagnin, Giacomo
author2_role author
author
author
dc.contributor.none.fl_str_mv Ingeniería Energética
dc.subject.none.fl_str_mv sCO2 power cycle
Thermo-economic analysis
CSP power plant
Thermal Energy Storage
topic sCO2 power cycle
Thermo-economic analysis
CSP power plant
Thermal Energy Storage
description The interest in Supercritical Carbon Dioxide (sCO2) power cycles has grown exponentially in the last decade, thanks to distinctive features like the possibility to achieve high thermal efficiencies at intermediate temperature, small footprint and adaptability to a wide variety of energy sources. In the present work, the potential of this technology is studied for Concentrated Solar Power applications, in particular Solar Tower systems with Thermal Energy Storage. Further to a previous thorough sensitivity analysis of twelve sCO2 cycles assessing the impact of turbine inlet temperature and pressure ratio on thermal efficiency, specific work, solar share and temperature rise across the solar receiver, the present paper investigates the features of two of these cycles in more detail. The most important conclusions of this section are that: a) the peak values of these thermodynamic figures of merit are obtained at different pressure ratios; b) specific work and temperature rise across the receiver seem to follow parallel trends whilst this is not the case for thermal efficiency; c) for a given turbine inlet temperature, higher pressure ratios increase the temperature rise across the receiver strongly, but the effect on thermal efficiency is uncertain as this can either increase or decrease, depending on the cycle considered. A deeper analysis of thermal efficiency and receiver temperature rise is therefore mandatory, given that these parameters have a very strong effect on the capital cost of CSP power plants. On one hand, a higher thermal efficiency implies a smaller solar field, the largest contributor to the plant capital cost; on the other, the temperature rise across the receiver is inversely proportional to the size of the thermal energy storage systems, as it is also the case for state of the art steam turbine based CSP plants. In order to quantify these trends, an economic analysis is developed using an in-house code and the open-source software System Advisor Model to evaluate the trade-offs between these two effects. As a result, the Overnight Capital Cost is estimated at some 5000 $/kW, with the individual contributions of solar field, thermal energy storage and power block being given in the paper.
publishDate 2020
dc.date.none.fl_str_mv 2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/11441/183240
https://doi.org/10.1016/j.renene.2018.08.023
url https://hdl.handle.net/11441/183240
https://doi.org/10.1016/j.renene.2018.08.023
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Renewable Energy, 147, Part 3, 2905-2912.
https://www.sciencedirect.com/science/article/abs/pii/S0960148118309741
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:idUS. Depósito de Investigación de la Universidad de Sevilla
instname:Universidad de Sevilla (US)
instname_str Universidad de Sevilla (US)
reponame_str idUS. Depósito de Investigación de la Universidad de Sevilla
collection idUS. Depósito de Investigación de la Universidad de Sevilla
repository.name.fl_str_mv
repository.mail.fl_str_mv
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