Algorithm for sizing parabolic-trough solar collectors
Main Author: | |
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Publication Date: | 2021 |
Other Authors: | , |
Format: | Article |
Language: | eng |
Source: | Repositório Institucional da UNESP |
Download full: | http://dx.doi.org/10.1016/j.tsep.2021.100932 http://hdl.handle.net/11449/207677 |
Summary: | This work aims at developing a working algorithm to evaluate the necessary parabolic-trough solar collectors (PTCs) sizing for any application, basically, as a function of the thermal load and the demanded operating temperature. Energy balance and heat transfer accurate estimations were applied to the PTC parts resulting in a set of non-linear equations, which were solved by a commercial software. Result analyses showed that a maximum relative error of 5.9% in PTCs lengthwise sizing and 6.1% in the thermal efficiency were achieved when compared to available data in the literature (experimental and theoretical ones), demonstrating that the algorithm is suitable for dimensioning both evacuated and not evacuated PTCs. Also, the PTC geometry and thermal efficiency sensitivity were analyzed as a function of relevant parameters, showing the required PTC length increased and the thermal efficiency decreased as either the following parameters were reduced: the direct solar irradiation, the PTC width, the receiver absorptivity and the heat transfer fluid (HTF) mass flow rate (in laminar and transitional flow regime) or the following parameters were increased: the receiver emissivity, the useful heat and the HTF outlet temperature. Also, three commercial thermal fluids were analyzed along with pressurized water. It was shown that water had a superior performance up to an outlet temperature of 300 °C. For temperatures above 400 °C, the required PTC length increased rapidly. The use of an evacuated receiver can reduce the PTC length between 9% up to 160% depending on the analyzed variable. |
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Algorithm for sizing parabolic-trough solar collectorsAlgorithmParabolic trough collectorSizingSolar energyThis work aims at developing a working algorithm to evaluate the necessary parabolic-trough solar collectors (PTCs) sizing for any application, basically, as a function of the thermal load and the demanded operating temperature. Energy balance and heat transfer accurate estimations were applied to the PTC parts resulting in a set of non-linear equations, which were solved by a commercial software. Result analyses showed that a maximum relative error of 5.9% in PTCs lengthwise sizing and 6.1% in the thermal efficiency were achieved when compared to available data in the literature (experimental and theoretical ones), demonstrating that the algorithm is suitable for dimensioning both evacuated and not evacuated PTCs. Also, the PTC geometry and thermal efficiency sensitivity were analyzed as a function of relevant parameters, showing the required PTC length increased and the thermal efficiency decreased as either the following parameters were reduced: the direct solar irradiation, the PTC width, the receiver absorptivity and the heat transfer fluid (HTF) mass flow rate (in laminar and transitional flow regime) or the following parameters were increased: the receiver emissivity, the useful heat and the HTF outlet temperature. Also, three commercial thermal fluids were analyzed along with pressurized water. It was shown that water had a superior performance up to an outlet temperature of 300 °C. For temperatures above 400 °C, the required PTC length increased rapidly. The use of an evacuated receiver can reduce the PTC length between 9% up to 160% depending on the analyzed variable.São Paulo State University (Unesp), Campus of ItapevaSISEA Renewable and Alternative Energy Systems Lab. Escola Politécnica at University of São PauloSão Paulo State University (Unesp), Campus of ItapevaUniversidade Estadual Paulista (Unesp)Universidade de São Paulo (USP)Nascimento, Fernanda I. [UNESP]Zavaleta-Aguilar, Elí W. [UNESP]Simões-Moreira, José R.2021-06-25T10:59:12Z2021-06-25T10:59:12Z2021-08-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.tsep.2021.100932Thermal Science and Engineering Progress, v. 24.2451-9049http://hdl.handle.net/11449/20767710.1016/j.tsep.2021.1009322-s2.0-85105100510Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengThermal Science and Engineering Progressinfo:eu-repo/semantics/openAccess2021-10-23T17:45:50Zoai:repositorio.unesp.br:11449/207677Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-23T17:45:50Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Algorithm for sizing parabolic-trough solar collectors |
title |
Algorithm for sizing parabolic-trough solar collectors |
spellingShingle |
Algorithm for sizing parabolic-trough solar collectors Nascimento, Fernanda I. [UNESP] Algorithm Parabolic trough collector Sizing Solar energy |
title_short |
Algorithm for sizing parabolic-trough solar collectors |
title_full |
Algorithm for sizing parabolic-trough solar collectors |
title_fullStr |
Algorithm for sizing parabolic-trough solar collectors |
title_full_unstemmed |
Algorithm for sizing parabolic-trough solar collectors |
title_sort |
Algorithm for sizing parabolic-trough solar collectors |
author |
Nascimento, Fernanda I. [UNESP] |
author_facet |
Nascimento, Fernanda I. [UNESP] Zavaleta-Aguilar, Elí W. [UNESP] Simões-Moreira, José R. |
author_role |
author |
author2 |
Zavaleta-Aguilar, Elí W. [UNESP] Simões-Moreira, José R. |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Universidade de São Paulo (USP) |
dc.contributor.author.fl_str_mv |
Nascimento, Fernanda I. [UNESP] Zavaleta-Aguilar, Elí W. [UNESP] Simões-Moreira, José R. |
dc.subject.por.fl_str_mv |
Algorithm Parabolic trough collector Sizing Solar energy |
topic |
Algorithm Parabolic trough collector Sizing Solar energy |
description |
This work aims at developing a working algorithm to evaluate the necessary parabolic-trough solar collectors (PTCs) sizing for any application, basically, as a function of the thermal load and the demanded operating temperature. Energy balance and heat transfer accurate estimations were applied to the PTC parts resulting in a set of non-linear equations, which were solved by a commercial software. Result analyses showed that a maximum relative error of 5.9% in PTCs lengthwise sizing and 6.1% in the thermal efficiency were achieved when compared to available data in the literature (experimental and theoretical ones), demonstrating that the algorithm is suitable for dimensioning both evacuated and not evacuated PTCs. Also, the PTC geometry and thermal efficiency sensitivity were analyzed as a function of relevant parameters, showing the required PTC length increased and the thermal efficiency decreased as either the following parameters were reduced: the direct solar irradiation, the PTC width, the receiver absorptivity and the heat transfer fluid (HTF) mass flow rate (in laminar and transitional flow regime) or the following parameters were increased: the receiver emissivity, the useful heat and the HTF outlet temperature. Also, three commercial thermal fluids were analyzed along with pressurized water. It was shown that water had a superior performance up to an outlet temperature of 300 °C. For temperatures above 400 °C, the required PTC length increased rapidly. The use of an evacuated receiver can reduce the PTC length between 9% up to 160% depending on the analyzed variable. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-06-25T10:59:12Z 2021-06-25T10:59:12Z 2021-08-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.tsep.2021.100932 Thermal Science and Engineering Progress, v. 24. 2451-9049 http://hdl.handle.net/11449/207677 10.1016/j.tsep.2021.100932 2-s2.0-85105100510 |
url |
http://dx.doi.org/10.1016/j.tsep.2021.100932 http://hdl.handle.net/11449/207677 |
identifier_str_mv |
Thermal Science and Engineering Progress, v. 24. 2451-9049 10.1016/j.tsep.2021.100932 2-s2.0-85105100510 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Thermal Science and Engineering Progress |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
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1799964650503143424 |