Communication Dans Un Congrès Année : 2025

Production of photovoltaic modules with irradiation enhanced by flat metal reflectors

Résumé

Fixed plane reflectors are the simplest and most rustic way of increasing the photovoltaic output of a given surface area of flat modules. The gains from PV-reflector systems depend on climate, latitude and the geometry chosen. Theoretical and experimental studies [1] have shown that annual production gains of the order of 5 to 25% are easily achievable at mid-latitudes. What's more, the geometry makes it possible to select more or less the two periods in spring and autumn when yield is highest. The recent drop in the price of silicon modules means that by 2025, reflectors will no longer be an economically viable option if the sole aim is to generate electricity. However, they could play a role in reducing demand for rare materials in the future. In addition, installing them on flat roofs offers advantages in terms of building insulation, heat recovery heating in winter and limiting urban warming in summer. A system based on low LID PERC crystalline silicon modules with full or half cells and reflectors made of raw rolled aluminium or polished stainless steel was installed on the roof of the ‘École polytechnique novation centre’. Each module is equipped with an optimiser that allows it to operate at its optimal power independently of the other modules in its string. This study, benefits from the international standard meteorological measurements of the SIRTA - Palaiseau platform, a member of the BSRN which is based on Institut Polytechnique de Paris campus . This allows for a detailed analysis of the properties of this energy system. Measurements taken during the first two years showed that the gain due to the reflec- tors was highest in March and October and could reach 13%. Surface oxidation did not cause any measurable degradation in photo-voltaic production during these two years. Half-cells do not appear to offer any decisive advantage in this situation. Similarly, raw aluminium reflectors are not significantly less effective than polished stainless steel reflec- tors. A more in-depth four-year study should provide quantitative answers to questions concerning the efficiency of reflectors and modules and degradation. Metal reflectors have the advantage of being fully recyclable, but optical engineering could improve their reflective properties by increasing the solar radiation reflected in the active band of photovoltaic cells and reducing the infrared flux reflected towards the module. In this way, it may be possible to increase the photoelectric current and reduce cell overheating, which tends to reduce photovoltaic efficiency. The results obtained over four years with this experimental system, will be presented. [1] M. Pavlov, A. Migan-Dubois, V. Bourdin, M. Pons, M. Haeffelin, et al.. Experimental and Numerical Study of the Influence of String Mismatch on the Yield of PV Modules Augmented By Static Planar Reflectors. IEEE Journal of Photovoltaics, 5 (6), (2015) pp.1686 – 1691.

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Dates et versions

hal-05363465 , version 1 (13-11-2025)

Identifiants

  • HAL Id : hal-05363465 , version 1

Citer

Vincent Bourdin, Aguilar M. I. Torres, Badosa J., Parra J., Mekhaldi B., et al.. Production of photovoltaic modules with irradiation enhanced by flat metal reflectors. Journées nationales du photovoltaïque - Strasbourg (2025), FedPV, Nov 2025, Strasbourg, France. ⟨hal-05363465⟩
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