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Electrical and thermal performance evaluation of symmetric truncated C-PVT trough solar collectors with vertical bifacial receivers
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Energy system.ORCID iD: 0000-0002-0539-3291
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Energy system.
2018 (English)In: Solar Energy, ISSN 0038-092X, E-ISSN 1471-1257, Vol. 174, p. 683-690Article in journal (Refereed) Published
Abstract [en]

One way to reduce solar collectors’ production costs is to use concentrators that increase the output per photovoltaic cell. Concentrating collectors re-direct solar radiation that passes through an aperture into an absorber/receiver. Symmetrical truncated non-tracking C-PVT trough collectors based on a parabola and compound parabolic concentrator (CPC) geometries have been developed. The collector type has a central vertical bifacial (fin) receiver and it was optimized for lower latitudes. In this paper, the electrical and thermal performance of symmetric truncated non-tracking low concentrator PVT solar collectors with vertical bifacial receivers is analysed, through a numerical ray-tracing model software and a multi-paradigm numerical computing environment. A thermal (quasi-dynamic testing method for liquid heating collectors described in the international standard for solar thermal collectors ISO 9806:2013) and electrical performance models were implemented to evaluate the design concepts. The evaluation was made for heating Domestic Hot Water for a Single Family House in Fayoum (Egypt), where CPC geometries with a concentration factor of 1.6 achieved 8 to 13%rel higher energy yields (in kWh/m2/year) than the Pure Parabola geometries.

Place, publisher, year, edition, pages
Elsevier Ltd , 2018. Vol. 174, p. 683-690
Keywords [en]
Bifacial receiver, Electrical and thermal yield evaluation, Ray-tracing, Symmetric C-PVT collector
National Category
Energy Systems
Research subject
Sustainable Urban Development
Identifiers
URN: urn:nbn:se:hig:diva-28322DOI: 10.1016/j.solener.2018.09.045ISI: 000451499500065Scopus ID: 2-s2.0-85053808056OAI: oai:DiVA.org:hig-28322DiVA, id: diva2:1255908
Available from: 2018-10-15 Created: 2018-10-15 Last updated: 2021-11-18Bibliographically approved
In thesis
1. Reflector Optimization for Low Concentration Photovoltaic-Thermal Solar Collectors
Open this publication in new window or tab >>Reflector Optimization for Low Concentration Photovoltaic-Thermal Solar Collectors
2022 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The alarming new global warming and increasing awareness related to climate change (mainly due to the high emissions of carbon dioxide) in recent decades linked all nations into a common cause, which requires ambitious efforts to combat climate change by adapting energy systems to its effects.

The knowledge gain presented in this dissertation establishes the foundations for the development of a more efficient concentrating photovoltaic-thermal (PVT) solar collector. The presented work provides decision-makers with a broader, more detailed performance assessment of concentrating PVT solar collectors.

A critical issue for concentrating PVT solar collectors lies in the respective reflector shape, which will determine, to some extent, the overall performance of the CPVT collector. Therefore, several symmetrical reflector design concepts were designed and optimized through Monte Carlo ray-tracing software. With the support of a MATLAB script, a simulation test methodology has been developed and optimized, allowing a more thorough analysis of the results regarding the viability of the different reflector shapes, which established the compound parabolic collector (CPC) to be the most appropriate reflector geometry for PVT solar collectors.

Moreover, CPC-PVT solar collectors (based on the findings described above) were designed, built and outdoor tested (under steady-state method guidelines) for their thermal and electrical peak efficiencies, heat losses and incidence angle modifier (IAM) coefficients.

The developments achieved in this dissertation significantly enhanced the annual performance of CPC-CPVT solar collectors, which closes the efficiency/performance gap between mature technologies such as PV modules or ST collectors.

Abstract [sv]

Den alarmerande globala uppvärmningen och den ökande medvetenheten i samband med klimatförändringar på grund av de höga utsläppen av koldioxid har samlat alla nationer till den gemensama uppgiften, att bekämpa klimatförändringarna och effekterna av dem genom anpassning av energisystemen.

Den kunskapsökning som presenteras i denna avhandling utgör grunden för utvecklingen av effektivare koncentrerande solcellsmoduler. Det presenterade arbetet möjliggör en bredare och mer detaljerad analys av prestandan hos koncentrerande PVT-moduler.

En kritisk fråga för den koncentrerande PVT solfångarens prestanda är reflektorns geometri, som i hög grad påverkar verkningsgraden. Därför designades och optimerades flera symmetriska reflektorgeometrier. Med hjälp av en Monte Carlo ray-tracing programvara. Med stöd av ett MATLAB-skript har en simuleringstestmetodik utvecklats vilken möjliggör en mer ingående analys av funktionen hos de olika reflektorformerna. Den visade att compound parabolic collector (CPC) är den mest lämpliga reflektorgeometrin för ej solföljande koncentrerande PVT-solfångare.

Dessutom konstruerades, byggdes och testades CPC-PVT-solfångare, baserat på de resultat som beskrivs ovan, enligt steady-state-metoden, för att få termiska och elektriska verkningsgrader värmeförluster och infallsvinkelberoende.

Den utveckling som uppnåtts i denna avhandling förbättrar den årliga prestanda hos CPVT-solfångare avsevärt, vilket minskar effektivitetsgapet till mognare tekniker som solcellsmoduler och termiska solfångare.

Place, publisher, year, edition, pages
Gävle: Gävle University Press, 2022. p. 153
Series
Doctoral thesis ; 26
Keywords
Photovoltaic-thermal collector, experimental assessment, collector performance assessment, optical efficiency, concentrating PVT solar collector, ray tracing, Fotovoltaisk-termisk kollektor, experimentell utvärdering, prestandautvärdering, optisk effektivitet, koncentrerande PVT-solfångare, strålgångsanalys
National Category
Energy Systems
Identifiers
urn:nbn:se:hig:diva-37391 (URN)978-91-88145-81-9 (ISBN)978-91-88145-82-6 (ISBN)
Public defence
2022-01-28, 13:302, Gävle, 09:00 (English)
Opponent
Supervisors
Available from: 2022-01-04 Created: 2021-11-18 Last updated: 2024-07-02Bibliographically approved

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Cabral, DiogoKarlsson, Björn O.

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