Experimental investigation on heat transfer to supercritical CO2 in a microtube up to 30 MPa for application in the NET Power cycle

Producción Científica

Detalles Bibliográficos
Autores: Velázquez Palencia, Iván, Cantero Sposetti, Danilo Alberto, Demeyer, Frederiek, Reyes Serrano, Miriam
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2026
País:España
Institución:Universidad de Valladolid
Repositorio:UVaDOC. Repositorio Documental de la Universidad de Valladolid
OAI Identifier:oai:uvadoc.uva.es:10324/80694
Acceso en línea:https://doi.org/10.1016/j.applthermaleng.2025.129206
https://uvadoc.uva.es/handle/10324/80694
Access Level:acceso abierto
Palabra clave:NET power cycle
Oxy-combustion
Compact heat exchangers
Neural network
Heat transfer
Supercritical carbon dioxide
Microtube heat exchanger
33 Ciencias Tecnológicas
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spelling Experimental investigation on heat transfer to supercritical CO2 in a microtube up to 30 MPa for application in the NET Power cycleVelázquez Palencia, IvánCantero Sposetti, Danilo AlbertoDemeyer, FrederiekReyes Serrano, MiriamNET power cycleOxy-combustionCompact heat exchangersNeural networkHeat transferSupercritical carbon dioxideMicrotube heat exchanger33 Ciencias TecnológicasProducción CientíficaMicrotube heat exchangers represent a high-performance alternative to conventional printed circuit designs for the thermal recuperator of the innovative oxy-combustion NET Power cycle, offering potential improvements in both system efficiency and compactness. To support this technology transition, this study presents an experi- mental investigation of heat transfer in CO2 at supercritical pressures up to 30 MPa. Experiments were conducted using a 1700 mm long, 0.88 mm inner diameter, uniformly heated horizontal microtube designed to replicate the operating conditions of a microtube heat exchanger. An experimental setup was built to measure local heat transfer coefficients of CO2, with a parametric analysis performed to evaluate the influence of mass flux, heat flux, inlet temperature, buoyancy, and flow acceleration. Tests were conducted at pressures of 10, 15, 20, 25 and 30 MPa. Results show that the heat transfer improves with increasing mass flux. At 10 MPa, the heat transfer coefficient exhibits a peak near the pseudo-critical temperature, followed by a deterioration and subsequent recovery. With increasing thermal input, the peak is attenuated, while heat transfer performance improves at higher pressures. Raising inlet temperatures enhances heat transfer in the thermal inflow region, reduces the peak value at 10 MPa, and causes the heat transfer coefficients to converge across different pressures. Buoyancy effects are most pronounced at 10 MPa and become weaker as pressure increases. Moreover, a new deep neural network model was developed to predict heat transfer coefficients, demonstrating an average deviation of 6.34 %. The present study substantially expands the existing experimental database, provides new physical in- terpretations of key phenomena, and translates these findings into a predictive tool applicable to engineering designElsevier2026info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://doi.org/10.1016/j.applthermaleng.2025.129206https://uvadoc.uva.es/handle/10324/80694reponame:UVaDOC. Repositorio Documental de la Universidad de Valladolidinstname:Universidad de ValladolidIngléshttps://www.sciencedirect.com/science/article/pii/S1359431125037986info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/oai:uvadoc.uva.es:10324/806942026-06-13T12:44:47Z
dc.title.none.fl_str_mv Experimental investigation on heat transfer to supercritical CO2 in a microtube up to 30 MPa for application in the NET Power cycle
title Experimental investigation on heat transfer to supercritical CO2 in a microtube up to 30 MPa for application in the NET Power cycle
spellingShingle Experimental investigation on heat transfer to supercritical CO2 in a microtube up to 30 MPa for application in the NET Power cycle
Velázquez Palencia, Iván
NET power cycle
Oxy-combustion
Compact heat exchangers
Neural network
Heat transfer
Supercritical carbon dioxide
Microtube heat exchanger
33 Ciencias Tecnológicas
title_short Experimental investigation on heat transfer to supercritical CO2 in a microtube up to 30 MPa for application in the NET Power cycle
title_full Experimental investigation on heat transfer to supercritical CO2 in a microtube up to 30 MPa for application in the NET Power cycle
title_fullStr Experimental investigation on heat transfer to supercritical CO2 in a microtube up to 30 MPa for application in the NET Power cycle
title_full_unstemmed Experimental investigation on heat transfer to supercritical CO2 in a microtube up to 30 MPa for application in the NET Power cycle
title_sort Experimental investigation on heat transfer to supercritical CO2 in a microtube up to 30 MPa for application in the NET Power cycle
dc.creator.none.fl_str_mv Velázquez Palencia, Iván
Cantero Sposetti, Danilo Alberto
Demeyer, Frederiek
Reyes Serrano, Miriam
author Velázquez Palencia, Iván
author_facet Velázquez Palencia, Iván
Cantero Sposetti, Danilo Alberto
Demeyer, Frederiek
Reyes Serrano, Miriam
author_role author
author2 Cantero Sposetti, Danilo Alberto
Demeyer, Frederiek
Reyes Serrano, Miriam
author2_role author
author
author
dc.subject.none.fl_str_mv NET power cycle
Oxy-combustion
Compact heat exchangers
Neural network
Heat transfer
Supercritical carbon dioxide
Microtube heat exchanger
33 Ciencias Tecnológicas
topic NET power cycle
Oxy-combustion
Compact heat exchangers
Neural network
Heat transfer
Supercritical carbon dioxide
Microtube heat exchanger
33 Ciencias Tecnológicas
description Producción Científica
publishDate 2026
dc.date.none.fl_str_mv 2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://doi.org/10.1016/j.applthermaleng.2025.129206
https://uvadoc.uva.es/handle/10324/80694
url https://doi.org/10.1016/j.applthermaleng.2025.129206
https://uvadoc.uva.es/handle/10324/80694
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://www.sciencedirect.com/science/article/pii/S1359431125037986
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/4.0/
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:UVaDOC. Repositorio Documental de la Universidad de Valladolid
instname:Universidad de Valladolid
instname_str Universidad de Valladolid
reponame_str UVaDOC. Repositorio Documental de la Universidad de Valladolid
collection UVaDOC. Repositorio Documental de la Universidad de Valladolid
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812429

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