The role of insert devices on enhancing heat transfer in a flat-plate solar water collector
This work presents a comparative experimental study of heat transfer enhancement in a flat-plate solar water collector using insert devices. Three wire-coils and three twisted-tapes were selected with representative geometrical characteristics typically employed in industrial applications. Isotherma...
| Autores: | , , , |
|---|---|
| Formato: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2018 |
| País: | España |
| Recursos: | Universidad Politécnica de Cartagena(UPCT) |
| Repositorio: | Repositorio Digital UPCT |
| OAI Identifier: | oai:repositorio.upct.es:10317/13343 |
| Acesso em linha: | http://hdl.handle.net/10317/13343 https://www.sciencedirect.com/science/article/pii/S1359431117360891 |
| Access Level: | acceso abierto |
| Palavra-chave: | Flat-plate solar collector Heat transfer enhancement Wire-coil inserts Twisted tape inserts Ingeniería Mecánica |
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The role of insert devices on enhancing heat transfer in a flat-plate solar water collectorGarcía Pinar, AlbertoHerrero Martín, RuthSolano Fernández, Juan PedroPérez García, JoséFlat-plate solar collectorHeat transfer enhancementWire-coil insertsTwisted tape insertsIngeniería MecánicaThis work presents a comparative experimental study of heat transfer enhancement in a flat-plate solar water collector using insert devices. Three wire-coils and three twisted-tapes were selected with representative geometrical characteristics typically employed in industrial applications. Isothermal pressure drop tests were carried out to obtain the fully-developed Fanning friction factor for a range of Reynolds numbers Re = [80–9000]. The increase in friction factor in comparison to smooth tube was computed for all the devices. Depending on Reynolds number and insert geometry fi/fs values ranged from 1.3 to 79.8. Furthermore, detailed temperature profiles were obtained for different sections along the absorber plate and the risers for five different mass flow rates covering the Reynolds range from [400–2500]. The increase of the inner heat transfer coefficient by the inserts caused an important decrease of the absorber temperature. At increasing mass flow rates (from Re ≈ 1000), all the inserts showed a very similar thermal performance which make them suitable for inserting within harp-type solar collectors, where pressure drop is not a constraint. The best inserts TT03, WC01 and WC02 gave at Re ≈ 1500 maximum absorber temperature decreases (insert vs smooth tube) of 5.05 °C, 5.40 °C and 5.34 °C. In serpentine-type solar collectors, due to pressure drop constraints, the wire coil WC01 with a moderate pitch to wire-diameter ratio (p/d = 1.5 and e/d = 0.07), is the best specimen to insert. WC01 presents a moderate pressure drop increase (fi/fs = 2.8 at Re ≈ 1000), an early promotion of turbulent flow (at Re ≈ 700), and a significant reduction of the absorber temperature (decreasing 4.84 °C vs smooth tube at Re ≈ 1000).The authors gratefully acknowledge the “Agencia de Ciencia y Tecnología de la Región de Murcia” (Fundación Séneca: Project with Ref. 15297/PI/10) and the Spanish Ministry of Science (Project with Ref. ENE2011-28571-C02-01) for supporting this research.ElsevierFundación SénecaMinisterio de Ciencia e Innovación202420242018info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfapplication/pdfhttp://hdl.handle.net/10317/13343https://www.sciencedirect.com/science/article/pii/S1359431117360891reponame:Repositorio Digital UPCTinstname:Universidad Politécnica de Cartagena(UPCT)InglésENE2011-28571-C02-0115297/PI/10Atribución-NoComercial-SinDerivadas 3.0 EspañaAtribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:repositorio.upct.es:10317/133432026-05-15T06:39:02Z |
| dc.title.none.fl_str_mv |
The role of insert devices on enhancing heat transfer in a flat-plate solar water collector |
| title |
The role of insert devices on enhancing heat transfer in a flat-plate solar water collector |
| spellingShingle |
The role of insert devices on enhancing heat transfer in a flat-plate solar water collector García Pinar, Alberto Flat-plate solar collector Heat transfer enhancement Wire-coil inserts Twisted tape inserts Ingeniería Mecánica |
| title_short |
The role of insert devices on enhancing heat transfer in a flat-plate solar water collector |
| title_full |
The role of insert devices on enhancing heat transfer in a flat-plate solar water collector |
| title_fullStr |
The role of insert devices on enhancing heat transfer in a flat-plate solar water collector |
| title_full_unstemmed |
The role of insert devices on enhancing heat transfer in a flat-plate solar water collector |
| title_sort |
The role of insert devices on enhancing heat transfer in a flat-plate solar water collector |
| dc.creator.none.fl_str_mv |
García Pinar, Alberto Herrero Martín, Ruth Solano Fernández, Juan Pedro Pérez García, José |
| author |
García Pinar, Alberto |
| author_facet |
García Pinar, Alberto Herrero Martín, Ruth Solano Fernández, Juan Pedro Pérez García, José |
| author_role |
author |
| author2 |
Herrero Martín, Ruth Solano Fernández, Juan Pedro Pérez García, José |
| author2_role |
author author author |
| dc.contributor.none.fl_str_mv |
Fundación Séneca Ministerio de Ciencia e Innovación |
| dc.subject.none.fl_str_mv |
Flat-plate solar collector Heat transfer enhancement Wire-coil inserts Twisted tape inserts Ingeniería Mecánica |
| topic |
Flat-plate solar collector Heat transfer enhancement Wire-coil inserts Twisted tape inserts Ingeniería Mecánica |
| description |
This work presents a comparative experimental study of heat transfer enhancement in a flat-plate solar water collector using insert devices. Three wire-coils and three twisted-tapes were selected with representative geometrical characteristics typically employed in industrial applications. Isothermal pressure drop tests were carried out to obtain the fully-developed Fanning friction factor for a range of Reynolds numbers Re = [80–9000]. The increase in friction factor in comparison to smooth tube was computed for all the devices. Depending on Reynolds number and insert geometry fi/fs values ranged from 1.3 to 79.8. Furthermore, detailed temperature profiles were obtained for different sections along the absorber plate and the risers for five different mass flow rates covering the Reynolds range from [400–2500]. The increase of the inner heat transfer coefficient by the inserts caused an important decrease of the absorber temperature. At increasing mass flow rates (from Re ≈ 1000), all the inserts showed a very similar thermal performance which make them suitable for inserting within harp-type solar collectors, where pressure drop is not a constraint. The best inserts TT03, WC01 and WC02 gave at Re ≈ 1500 maximum absorber temperature decreases (insert vs smooth tube) of 5.05 °C, 5.40 °C and 5.34 °C. In serpentine-type solar collectors, due to pressure drop constraints, the wire coil WC01 with a moderate pitch to wire-diameter ratio (p/d = 1.5 and e/d = 0.07), is the best specimen to insert. WC01 presents a moderate pressure drop increase (fi/fs = 2.8 at Re ≈ 1000), an early promotion of turbulent flow (at Re ≈ 700), and a significant reduction of the absorber temperature (decreasing 4.84 °C vs smooth tube at Re ≈ 1000). |
| publishDate |
2018 |
| dc.date.none.fl_str_mv |
2018 2024 2024 |
| 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 |
http://hdl.handle.net/10317/13343 https://www.sciencedirect.com/science/article/pii/S1359431117360891 |
| url |
http://hdl.handle.net/10317/13343 https://www.sciencedirect.com/science/article/pii/S1359431117360891 |
| dc.language.none.fl_str_mv |
Inglés |
| language_invalid_str_mv |
Inglés |
| dc.relation.none.fl_str_mv |
ENE2011-28571-C02-01 15297/PI/10 |
| dc.rights.none.fl_str_mv |
Atribución-NoComercial-SinDerivadas 3.0 España Atribución-NoComercial-SinDerivadas 3.0 España http://creativecommons.org/licenses/by-nc-nd/3.0/es/ info:eu-repo/semantics/openAccess |
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Atribución-NoComercial-SinDerivadas 3.0 España http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
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openAccess |
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application/pdf application/pdf |
| dc.publisher.none.fl_str_mv |
Elsevier |
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Elsevier |
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reponame:Repositorio Digital UPCT instname:Universidad Politécnica de Cartagena(UPCT) |
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Universidad Politécnica de Cartagena(UPCT) |
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Repositorio Digital UPCT |
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Repositorio Digital UPCT |
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1869420894168809472 |
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15,301603 |