A seasonal experimental study on a novel CdTe based multi-layer PV ventilated window system integrated with PCM under different operating modes

To expand the functions of building window and enhance its thermal performance, a novel CdTe multi-layer PV ventilated window system integrated with phase change material (PCM) was proposed. The novel window system was fabricated, constructed and installed on the south façade of a building room and several groups of seasonal experiments were conducted under different operating modes. Electrical, thermal and daylighting performance of the system were investigated. Main conclusions are: (1) For the heating season mode experiment, daily total electricity generation (EPV) and average electrical efficiency (ηe) were 0.383 kWh and 7.39 %. Room air temperature difference (ΔTroom) between the experimental room and reference room was in the range of 0.88 °C–7.04 °C. Effective functions of space heating and heat preservations were achieved; (2) For the cooling season mode, daily EPV and average ηe were 0.159 kWh and 6.33 %. ΔTroom was in the range of −4.26 °C to −1.26 °C. Effective functions of passive ventilation cooling was realized; (3) The novel window system can provide useful daylight illuminance (UDI) for most time during the working time; (4) Based on the experiment results on transition season, other alternative operating strategies were recommended for specific different ambient condition days.