Potential building energy savings by passive strategies combining daytime radiative coolers and thermochromic smart windows

• Published in: Case studies in thermal engineering 2021-12, Vol.28, p.101517, Article 101517
• Main Authors: Lin, Kaixin, Chao, Luke, Lee, Hau Him, Xin, Ren, Liu, Sai, Ho, Tsz Chung, Huang, Baoling, Yu, Kin Man, Tso, Chi Yan
• Format: Article
• Language: English
• Subjects: Building design; Energy saving; Field investigation; Passive daytime radiative cooling; Thermochromic smart windows
• ISSN: 2214-157X; 2214-157X
• DOI: 10.1016/j.csite.2021.101517

Reducing the energy consumed by space cooling and providing outstanding thermally insulated windows are essential requirements for a smart green building. In this study, a new building design concept for envelope/façade is proposed and demonstrated, providing a solution for thermal management in buildings. This new design for the envelope/façade of buildings comprises two major passive and energy-free technologies, a daytime radiative cooler and a thermochromic smart window. The PDMS-silica-silver daytime passive radiative cooler can provide a cooling effect to the indoor environment without energy input, meanwhile the thermochromic smart window using PNIPAm hydrogel can passively modulate the solar irradiance entering buildings through windows. Hence, the energy needed for indoor heating, cooling and lighting can be reduced significantly. To evaluate the energy-saving performance, model houses are built, one of which is assembled using the proposed building design. The orientation effect on the indoor air temperature of the model houses is investigated. Under intensive solar irradiance, a maximum reduction of 4.8 °C of the indoor air temperature is achieved in the model house constructed using the proposed building design. An energy saving of about 17% of air-conditioning systems in buildings constructed with this new design is expected during daytime operation. [Display omitted]