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Measurements of the Electrical Incidence Angle Modifiers of an Asymmetrical Photovoltaic/Thermal Compound Parabolic Concentrating-Collector

In English

Författare

Summary, in English

Reflector edges, sharp acceptance angles and by-pass diodes introduce large variations in the electrical performance of asymmetrical concentrating photovoltaic/thermal modules over a short incidence angle interval. It is therefore important to quantify these impacts precisely. The impact on the electrical performance of the optical properties of an asymmetrical photovoltaic/thermal CPC-collector was measured in Maputo, Mozambique. The measurements were carried out with the focus on attaining a high resolution incidence angle modifier in both the longitudinal and transversal directions, since large variations were expected over small angle intervals. A detailed analysis of the contribution of the diffuse radiation to the total output was also carried out. The solar cells have an electrical efficiency of 18% while the maximum measured electrical efficiency of the collector was 13.9 % per active glazed area and 20.9 % per active cell area, at 25 °C. Such data make it possible to quantify not only the electrical performance for different climatic and operating conditions but also to determine potential improvements to the collector design. The electrical output can be increased by a number of different measures, e.g. removing the outermost cells, turning the edge cells 90°, dividing each receiver side into three or four parts and directing the tracking, when used, along a north-south axis.

Publiceringsår

2013

Språk

Engelska

Sidor

37-43

Publikation/Tidskrift/Serie

Engineering

Volym

5

Issue

1B

Dokumenttyp

Artikel i tidskrift

Förlag

Scientific Research Publishing (SCIRP)

Ämne

  • Building Technologies

Nyckelord

  • PVT hybrid
  • CPC-collector
  • incidence angle modifier
  • asymmetric collector
  • electrical efficiency

Status

Published

Projekt

  • International Energy Agency. Solar Heating and Cooling Programme

Forskningsgrupp

  • Energy and Building Design

ISBN/ISSN/Övrigt

  • ISSN: 1947-394X