Abstract
PV windows can potentially produce electricity, reduce the air-conditioning load, and provide natural light. Cross-seasonal experimental tests for long period could eliminate the gap between real outdoor test and simulation estimation. In this research, the lighting-thermal-electricity performance of high-efficiency c-silicon PV windows was tested, and the improvement has been put forward according to the conditions. The long-term experiment was conducted cross different seasons, including summer, autumn, and winter seasons. The highest average power generation, 50W/m2, could be found in autumn. The average outside surface temperature of the PV window would reach 48 °C in sunny days in the autumn, which was higher than other seasons. Although the c-Si PV window maybe block the partial daylighting, the daylighting requirement still could be satisfied with the most days. Furthermore, the average Useful Daylight Illuminance was the highest in summer up to 0.79, and the average illumination uniform could be achieved at a high level in all seasons. For the improvement suggestions, some measures could be taken to reduce the indoor cooling load in summer. During winter, appropriate inner shading measures might be taken to prevent excessive illumination in the building, and allow the electricity and thermal performance of PV window.
Highlights
According to International Energy Outlook (2016) [1], building energy consumption is an important part of world energy consumption, which accounts for 39%
The results show that PVB-DSF can obtain higher solar heat gain coefficient (SHGC) and lower heat transfer coefficient under non-ventilated mode
Based on the data from Zhongli Talesun company, the rated conversion efficiency of the C-Si PV module was around 18%. This indicates that the innovation designed C-Si PV windows could work normally more than half of days were cloudy
Summary
According to International Energy Outlook (2016) [1], building energy consumption is an important part of world energy consumption, which accounts for 39%. PV windows in gain different seasonsenergy through simulation.InInwinter, summer, photovoltaic double-layer windows can effectively reduce indoor heat gain and cooling energy consumption. In winter, it reduces indoor heat gain, thereby increasing the indoor heating load by reducing the influx heat gain, thereby increasing the indoor heating load by reducing the influx of heat from outdoor to indoor. Chen Haifei et al [11] used different control strategies to discharge the heat from the hollow part of the air-cooled photovoltaic louver outdoors in summer and exchange heat with indoors in winter, so as to further enhance the reuse of photovoltaic window energy and improve the operation efficiency of photovoltaic windows. To analyze the performance of photovoltaic windows in different seasons, previous studies mostly used simulation, or only tested on typical days. In order to more accurately study the performance of photovoltaic windows across the seasons, a long-term experimental platform for photovoltaic windows was established, and a more accurate cross-seasonal analysis of the results was carried out, and the performance and optimization methods of photovoltaic windows during different periods of the year would be carried out
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