Regional applicability of thermochromic windows based on dynamic radiation spectrum

作者：Shen, Yi; Xue, Peng^*; Luo, Tao^*; Zhang, Yanyun; Tso, Chi Yan; Zhang, Nan; Sun, Yuying; Xie, Jingchao; Liu, Jiaping

来源：RENEWABLE ENERGY, 2022, 196: 15-27.

DOI：10.1016/j.renene.2022.06.135

• Solar spectrum
• Thermochromic window
• Energy consumption
• Thermal comfort
• UDI
• Color shift

Thermochromic (TC) window has been developed as an effective approach to realize building energy saving by regulating solar transmittance according to temperature stimuli; however, the non-uniform transmission and absorption of the solar spectrum result in a significant color shift and temperature increase. This study investigates the radiometric, photometric and colorimetric performances of four different TC windows with an experiment-verified model. The simulation and calculation are conducted under measured spectrum conditions in Beijing; subsequently, a comprehensive evaluation method for daylight-thermal environment method is conducted. The results show that all selected TC windows possess an energy efficiency between 3.0% and 7.9%, improve daylight availability from 2.8% to 18.8%, and reduce discomfort hours by up to 111 h. Two hydrogel TC windows improve the quality of dynamic transmitted daylight by nearly 7% considering correlated color temperature and color rendering index; the HETS hydrogel TC window is found to be the most suitable for Beijing. Finally, to increase the application potential of TC windows in Beijing, several material properties are desired, including high transition temperature with high solar modulation capability, high and uniform visible light trans-mittance, and low emissivity. This process for the optimization of climate-responsive material can be further adopted in other areas.

• 单位
  北京工业大学; 中国建筑科学研究院