Zewei Shao, Aibin Huang, Cuicui Cao, Xiaowei Ji, Wei Hu, Hongjie Luo, John Bell, Ping Jin, Ronggui Yang, Xun Cao
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Tri-band electrochromic smart window for energy savings in buildings
Electrochromic windows provide a sustainable solution for use in energy-efficient buildings as their varying optical properties in changing weather conditions allow the optimization of solar radiation heat gain and indoor thermal comfort. However, as the wavelength range of sunlight that can be used remains limited, broader implementation of this technology is hampered. Here we present an electrochromic design that combines radiative cooling of mid-infrared light and maximized utilization of both visible and near-infrared light. Our electrochromic window takes advantage of a WO3/VO2 film structure that, with a controllable lithium-ion intercalation depth, affords three active optical states to control visible and near-infrared transmittance independently. Moreover, the use of electrodes with preferred emissivity at both surfaces serves to optimize the radiative heat exchange between the indoor and outdoor environments. Field experiments and simulations show that our device exhibits higher energy savings than a commercial low-emissivity glass in most climate zones around the world. Our findings suggest ample opportunities for energy-saving window designs that can help achieve global carbon neutrality and sustainability. Buildings account for a large proportion of the global energy consumption. Here the electrochromic smart window realizes year-round energy savings by managing visible, near-infrared and mid-infrared light.
期刊介绍:
Nature Sustainability aims to facilitate cross-disciplinary dialogues and bring together research fields that contribute to understanding how we organize our lives in a finite world and the impacts of our actions.
Nature Sustainability will not only publish fundamental research but also significant investigations into policies and solutions for ensuring human well-being now and in the future.Its ultimate goal is to address the greatest challenges of our time.