Light and Thermal Performances of Thermochromic Windows Based on Dynamic Radiation Spectrum
Thermochromic(TC)windows are an effective technology to achieve energy saving in buildings by adjusting the transmittance of solar radiation through temperature stimulation.However,the uneven transmission and absorption of the solar spectrum by glass will have an impact on building energy consumption and indoor light and heat environment.In this study,the energy consumption,thermal comfort and dynamic daylighting performances of three different TC windows in Beijing were studied based on the daytime dynamic radiation spectrum through experiments and simulations.The results show that the energy saving rate of the TC window can reach 8％,the effective lighting illuminance can be increased by 15.9％,and thermal discomfort time can be reduced by more than 100 hours.The hydrogel glass material window with high heat storage capacity has the best energy saving potential and the highest applicability in the Beijing area.In order to continue to improve the regional application effect of TC windows,it was recommended to further improve the transition temperature and solar energy modulation capability of thermochromic materials,reduce the emissivity,and enhance the uniformity of visible light transmittance.This research process can be used for the evaluation and optimization of spectrally selective windows in different climatic regions.
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