Abstract

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.

Highlights

  • The electrical part of an asymmetric compound parabolic concentrating (CPC) photovoltaic/thermal hybrid (PV/T), collector has been investigated

  • 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

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Summary

Introduction

The electrical part of an asymmetric compound parabolic concentrating (CPC) photovoltaic/thermal hybrid (PV/T), collector has been investigated. The radiation is concentrated onto an aluminium thermal absorber on which PV cells have been laminated. Even though the concentration factor of the collector is low, equal to 1.5, the PV cells can still reach high temperatures. This will reduce the electric production and cooling is required in order to maintain electrical efficiency. This is carried out by running water inside the thermal absorber.

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