Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Energy-Saving Potential of Thermochromic Glazing in a Cold Climate
Windows are considered the least-efficient components in the thermal envelope driven by their low thermal resistance and static transmittance to solar gains. Thermochromic coatings are promising to address the latter. Nevertheless, current building energy simulation (BES) tools were not originally developed for the performance assessment of adaptive facades. Hence, in this paper, a previously developed 1-D transient heat transfer model was utilized to evaluate the annual heating and cooling energy performance of two thermochromic glazing systems, including commercial Ligand-Exchange (LET) and industrial Vanadium Dioxide (VO2) thermochromic coatings, and compare their performance to reference low-E coated glazing in the cold climate of Toronto, ON. Contrary to current BES, the model accounts for spectral-selectivity, gradual transmittance change, hysteresis, and switching time of thermochromic coatings. A representative room’s annual energy performance was evaluated for different glazing configurations and several exposures. The results show that the VO2 thermochromic glazing is the most energy-efficient configuration in Toronto, driven by low solar transmittance and increased near-infrared reflectance at higher coating temperatures. Furthermore, increasing the switching time and hysteresis width have less significant effects for VO2 glazing.
Energy-Saving Potential of Thermochromic Glazing in a Cold Climate
Windows are considered the least-efficient components in the thermal envelope driven by their low thermal resistance and static transmittance to solar gains. Thermochromic coatings are promising to address the latter. Nevertheless, current building energy simulation (BES) tools were not originally developed for the performance assessment of adaptive facades. Hence, in this paper, a previously developed 1-D transient heat transfer model was utilized to evaluate the annual heating and cooling energy performance of two thermochromic glazing systems, including commercial Ligand-Exchange (LET) and industrial Vanadium Dioxide (VO2) thermochromic coatings, and compare their performance to reference low-E coated glazing in the cold climate of Toronto, ON. Contrary to current BES, the model accounts for spectral-selectivity, gradual transmittance change, hysteresis, and switching time of thermochromic coatings. A representative room’s annual energy performance was evaluated for different glazing configurations and several exposures. The results show that the VO2 thermochromic glazing is the most energy-efficient configuration in Toronto, driven by low solar transmittance and increased near-infrared reflectance at higher coating temperatures. Furthermore, increasing the switching time and hysteresis width have less significant effects for VO2 glazing.
Energy-Saving Potential of Thermochromic Glazing in a Cold Climate
Environ Sci Eng
Wang, Liangzhu Leon (Herausgeber:in) / Ge, Hua (Herausgeber:in) / Zhai, Zhiqiang John (Herausgeber:in) / Qi, Dahai (Herausgeber:in) / Ouf, Mohamed (Herausgeber:in) / Sun, Chanjuan (Herausgeber:in) / Wang, Dengjia (Herausgeber:in) / Khaled, Khaled (Autor:in) / Berardi, Umberto (Autor:in) / Liao, Zaiyi (Autor:in)
International Conference on Building Energy and Environment ; 2022
Proceedings of the 5th International Conference on Building Energy and Environment ; Kapitel: 9 ; 71-80
05.09.2023
10 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Energy simulation , Energy efficiency , Climate-responsive facades , Adaptive glazing , Thermochromic coatings , Solar modulation Engineering , Building Physics, HVAC , Fire Science, Hazard Control, Building Safety , Sustainable Architecture/Green Buildings , Renewable and Green Energy , Environment, general
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