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Evaluation of energy efficiency and visual comfort of integrated semi-transparent PV in shading devices

Stamatakis Antonios

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Summary

Shading devices (SDs) play an important role in the energy efficiency of office buildings by adjusting solar influx radiation. Influenced by the shape of the SD, this leads in ranging results regarding heating, cooling, artificial lighting demands or visual comfort. As part of BIPV technologies, SDs can integrate semi-transparent photovoltaics (STPV) in order to produce electricity as well as exploit PV modules transparency, thus improving the performance of simple SDs. This paper presents a combined study of building energy consumption, electricity production and visual comfort of STPV system integrated into SDs. The aim is to investigate space‘s energy needs for heating and cooling energy and the energy that is used for artificial lighting, along with the energy that the STPV can produce. Moreover, quality of the visual interior environment is under investigation. Fourteen south-facing configurations of fixed SDs have been studied and categorized for a single office room, located in Mediterranean coastal city of Chania, Crete, Greece. A PV efficiency and visual transparency of 6% and 10% were attributed respectively to STPV systems mounted on SDs. Each model is incorporated into Energy Plus to carry out overall energy consumption, PV electricity production and visual comfort analyses.The results reveal that in overall energy performance, the SD ―Brise soleil full façade‖ contributes to the best energy performance, reducing overall energy demand by 128,16% according to ―Simple window‖. By contrast, the SD ―Horizontal louvers inwards inclined‖ contributes to the worst energy performance, reducing overall energy demand by 50,32% according to ―Simple window‖. The study also shows that all SDs with integrated south facing PV systems can efficiently produce PV electricity (178,25kWh/year up to 970,60kWh/year) which may be used for artificial lighting needs (6,48kWh/year up to 258,10kWh/year). Annual daylight levels seem to be lower than ― Simple window‘s‖ levels (896,80lux), ranging from 89,29lux to 727,98lux, as well as they appear a downward trend during summer time regardless of the abundant sky‘s daylight. According to glare, all SDs seem to provide values greater than office‘s threshold of 22.

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