Systematic testing of hybrid PV-thermal (PVT) solar collectors in steady-state and dynamic outdoor conditions

Hybrid photovoltaic-thermal (PVT) collectors have been proposed for the combined generation of electricity and heat from the same area. In order to predict accurately the electrical and thermal energy generation from hybrid PVT systems, it is necessary that both the steady-state and dynamic performa...

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Autores: Guarracino, Ilaria, Freeman, James, Ramos Cabal, Alba|||0000-0002-3841-3260, Markides, Christos
Tipo de recurso: artículo
Fecha de publicación:2019
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/134928
Acceso en línea:https://hdl.handle.net/2117/134928
https://dx.doi.org/10.1016/j.apenergy.2018.12.049
Access Level:acceso abierto
Palabra clave:Solar energy
Hybrid PVT collectors
Solar collectors
Collector performance analysis
Experimental characterisation of solar collectors
Dynamic modelling
Energia solar
Captadors solars
Àrees temàtiques de la UPC::Energies
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spelling Systematic testing of hybrid PV-thermal (PVT) solar collectors in steady-state and dynamic outdoor conditionsGuarracino, IlariaFreeman, JamesRamos Cabal, Alba|||0000-0002-3841-3260Markides, ChristosSolar energyHybrid PVT collectorsSolar collectorsCollector performance analysisExperimental characterisation of solar collectorsDynamic modellingEnergia solarCaptadors solarsÀrees temàtiques de la UPC::EnergiesHybrid photovoltaic-thermal (PVT) collectors have been proposed for the combined generation of electricity and heat from the same area. In order to predict accurately the electrical and thermal energy generation from hybrid PVT systems, it is necessary that both the steady-state and dynamic performance of the collectors is considered. This work focuses on the performance characterisation of non-concentrating PVT collectors under outdoor conditions. A novel aspect concerns the application of existing methods, adapted from relevant international standards for flat plate and evacuated tube solar-thermal collectors, to PVT collectors for which there is no formally established testing methodology at present. Three different types of PVT collector are tested, with a focus on the design parameters that affect their electrical and thermal performance during operation. Among other results, we show that a PVT collector suffers a 10% decrease in thermal efficiency when the electricity conversion is close to the maximum power point compared to open-circuit mode, and that a poor thermal contact between the PV laminate and the copper absorber can lead to a significant deterioration in thermal performance. The addition of a glass cover improves the thermal efficiency, but causes electrical performance losses that vary with the glass transmittance and the solar incidence angle. The reduction in electrical efficiency at large incidence angles is more significant than that due to elevated temperatures representative of water-heating applications. Dynamic performance is characterised by imposing a step change in irradiance in order to quantify the collector time constant and effective heat capacity. This paper demonstrates that PVT collectors are characterised by a slow thermal response in comparison to ordinary flat plate solar-thermal collectors, due to the additional thermal mass of the PV layer. A time constant of 8¿min is measured for a commercial PVT module, compared to 2¿min for a flat plate solar-thermal collector. It is also concluded that the use of a lumped, first-order dynamic model to represent the thermal mass of the PVT collector is not appropriate under certain irradiation regimes and may lead to inaccurate predictions of the system performance. This paper outlines a procedure for the testing and characterisation of solar collectors, provides valuable steady-state and dynamic performance characterisation data for various PVT collector designs, and also provides a framework for the application of this data in a system model to provide annual performance predictions in a range of geographical settings.Peer Reviewed20192019-04-1920192019-06-21journal articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/134928https://dx.doi.org/10.1016/j.apenergy.2018.12.049reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivs 3.0 Spainhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/1349282026-05-27T15:37:01Z
dc.title.none.fl_str_mv Systematic testing of hybrid PV-thermal (PVT) solar collectors in steady-state and dynamic outdoor conditions
title Systematic testing of hybrid PV-thermal (PVT) solar collectors in steady-state and dynamic outdoor conditions
spellingShingle Systematic testing of hybrid PV-thermal (PVT) solar collectors in steady-state and dynamic outdoor conditions
Guarracino, Ilaria
Solar energy
Hybrid PVT collectors
Solar collectors
Collector performance analysis
Experimental characterisation of solar collectors
Dynamic modelling
Energia solar
Captadors solars
Àrees temàtiques de la UPC::Energies
title_short Systematic testing of hybrid PV-thermal (PVT) solar collectors in steady-state and dynamic outdoor conditions
title_full Systematic testing of hybrid PV-thermal (PVT) solar collectors in steady-state and dynamic outdoor conditions
title_fullStr Systematic testing of hybrid PV-thermal (PVT) solar collectors in steady-state and dynamic outdoor conditions
title_full_unstemmed Systematic testing of hybrid PV-thermal (PVT) solar collectors in steady-state and dynamic outdoor conditions
title_sort Systematic testing of hybrid PV-thermal (PVT) solar collectors in steady-state and dynamic outdoor conditions
dc.creator.none.fl_str_mv Guarracino, Ilaria
Freeman, James
Ramos Cabal, Alba|||0000-0002-3841-3260
Markides, Christos
author Guarracino, Ilaria
author_facet Guarracino, Ilaria
Freeman, James
Ramos Cabal, Alba|||0000-0002-3841-3260
Markides, Christos
author_role author
author2 Freeman, James
Ramos Cabal, Alba|||0000-0002-3841-3260
Markides, Christos
author2_role author
author
author
dc.subject.none.fl_str_mv Solar energy
Hybrid PVT collectors
Solar collectors
Collector performance analysis
Experimental characterisation of solar collectors
Dynamic modelling
Energia solar
Captadors solars
Àrees temàtiques de la UPC::Energies
topic Solar energy
Hybrid PVT collectors
Solar collectors
Collector performance analysis
Experimental characterisation of solar collectors
Dynamic modelling
Energia solar
Captadors solars
Àrees temàtiques de la UPC::Energies
description Hybrid photovoltaic-thermal (PVT) collectors have been proposed for the combined generation of electricity and heat from the same area. In order to predict accurately the electrical and thermal energy generation from hybrid PVT systems, it is necessary that both the steady-state and dynamic performance of the collectors is considered. This work focuses on the performance characterisation of non-concentrating PVT collectors under outdoor conditions. A novel aspect concerns the application of existing methods, adapted from relevant international standards for flat plate and evacuated tube solar-thermal collectors, to PVT collectors for which there is no formally established testing methodology at present. Three different types of PVT collector are tested, with a focus on the design parameters that affect their electrical and thermal performance during operation. Among other results, we show that a PVT collector suffers a 10% decrease in thermal efficiency when the electricity conversion is close to the maximum power point compared to open-circuit mode, and that a poor thermal contact between the PV laminate and the copper absorber can lead to a significant deterioration in thermal performance. The addition of a glass cover improves the thermal efficiency, but causes electrical performance losses that vary with the glass transmittance and the solar incidence angle. The reduction in electrical efficiency at large incidence angles is more significant than that due to elevated temperatures representative of water-heating applications. Dynamic performance is characterised by imposing a step change in irradiance in order to quantify the collector time constant and effective heat capacity. This paper demonstrates that PVT collectors are characterised by a slow thermal response in comparison to ordinary flat plate solar-thermal collectors, due to the additional thermal mass of the PV layer. A time constant of 8¿min is measured for a commercial PVT module, compared to 2¿min for a flat plate solar-thermal collector. It is also concluded that the use of a lumped, first-order dynamic model to represent the thermal mass of the PVT collector is not appropriate under certain irradiation regimes and may lead to inaccurate predictions of the system performance. This paper outlines a procedure for the testing and characterisation of solar collectors, provides valuable steady-state and dynamic performance characterisation data for various PVT collector designs, and also provides a framework for the application of this data in a system model to provide annual performance predictions in a range of geographical settings.
publishDate 2019
dc.date.none.fl_str_mv 2019
2019-04-19
2019
2019-06-21
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/134928
https://dx.doi.org/10.1016/j.apenergy.2018.12.049
url https://hdl.handle.net/2117/134928
https://dx.doi.org/10.1016/j.apenergy.2018.12.049
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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