Experience on the behavior of different BiPV solution: electrical and thermal performance of roof and façade mounted micromorph.

Frontini, Francesco and Friesen, Gabi and Friesen, Thomas and Polo Lopez, Cristina Silvia (2013) Experience on the behavior of different BiPV solution: electrical and thermal performance of roof and façade mounted micromorph. In: 28th EU PVSEC, September 2013, Paris.

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Abstract

When installing Photovoltaic on Building, the mounting system significantly affects the heat-exchange between the module and the building envelope and the operating temperatures of the PV modules that strongly influence the energy yield of the PV system. For this reason it is important to be able to simulate and evaluate in advance the behavior and the possible advantages of a certain type of installation. This study aims to quantify the gains or losses in performance which are obtained by different levels or types of integration. Two outdoor measurement test stands were used to reproduce a realistic BIPV module integration: one of them without any ventilation in roof-top position (6° from the horizontal) and the other one in vertical façade position, ventilated and not. Some free-standing (ventilated) modules with 45° and 6° inclination are used for inter-comparison. The module packages consisted in different insulating materials and air cavities with always the same micromorph module technology at the top. Amorphous silicon (a-Si) based modules have the special characteristic to be able to temporarily recover part of the so called initial Staebler–Wronski degradation through thermal annealing. The study demonstrated that for a moderate climate as Lugano the gain in performance due to thermal annealing at higher operating temperatures compensates most of the losses, given by the negative Pmax temperature coefficient. The energy output of the integrated modules is almost the same as for the ventilated modules

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