Modelling of Thermo-optical Properties of Amorphous and Microcrystalline Silicon Semitransparent PV Layer

Abstract

Nowadays, one of the most promising renewable energy technology is based on photovoltaic conversion of solar energy. Application of PV systems integrated with building envelope allows electricity to be utilized on site for any functional needs. Building integrated photovoltaic (BIPV) is commonly used in representative, office buildings usually occupied during the day. The large surface area of external walls or roofs is covered with PV panels instead of traditional building materials. In highly glazed buildings, transparent elements are more often being equipped with PV cells placed between two sheets of glass. Moreover, brand new technologies focus currently on homogenous, transparent glass with different transparency.The main aim of the presented study was to analyse transparent PV (TPV) integrated with office windows. The following 10%, 20% or 30% of transparency degree were considered, depending on the required illuminance inside the room. The optical properties were obtained on the basis of literature review and manufactured data. Different types of TPV were defined for the purpose of building energy performance analysis. Numerical model was developed using control volume method. The properties of TPV glass layer were estimated considering thermo- electrical solar energy conversion, taking into account the sun beam angle and temperature of thepanel.The model of single office room with TPV windowpane was analysed numerically. Results obtained for different TPV panels were compared with traditional clear float double glazing. The following two building energy performance parameters were obtained from numerical analysis: electricity produced by TPV and solar heat gains. Based on simulation results, the overall yearly energy performance was presented and compared.