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https://www.eurekalert.org/news-releases/1144566
PRESS RELEASE: Windows are vital to buildings because they provide daylight, views, and a connection to the outdoors, but they are also weak points in the building envelope. They can cause significant unwanted heat gain or heat loss, increasing the demand for heating, ventilation, and air conditioning.
Thermochromic smart windows offer a passive solution. These windows use materials that change their optical properties in response to temperature. In cold conditions, they remain more transparent, allowing daylight and solar heat into the building. In hot conditions, they reduce solar transmission, especially in the near-infrared region, helping to limit overheating and lower cooling loads. Because the response is temperature-driven, they can operate without external power, sensors, or complex control systems.
A new review article published in Science Bulletin, titled “Thermochromic smart windows toward climate-resilient and energy efficient buildings: from lab to applications,” provides a comprehensive assessment of this technology. The study was conducted by Weiqiang Ma, Sai Liu, Junqi Wang, Fariborz Haghighat, and Shi-Jie Cao from Southeast University and Concordia University.
The review summarizes major thermochromic material systems, including vanadium dioxide, halide perovskites, hydrogels, liquid crystals, and ionic liquids. Each has advantages, such as near-infrared modulation, strong optical switching, or tunable transition temperatures. However, they also face challenges including high switching temperature, color change, haze, moisture sensitivity, mechanical fatigue, and long-term instability.
According to the authors, the key challenge is no longer only finding better materials, but translating material-level performance into reliable building-scale applications. Smart windows must balance visible transparency, solar modulation, thermal-infrared regulation, switching temperature, response speed, durability, and aesthetics. Their benefits also depend strongly on climate, façade orientation, building type, and glazing design. They may be especially useful in cooling-dominated regions, while in heating-dominated climates inappropriate switching could reduce useful winter solar gains.
The review calls for a shift from material-centered optimization to deployment-oriented design. Future thermochromic smart windows should be integrated with building energy management, HVAC, lighting, and shading systems. Rather than simply being “glass that changes color,” they could become dynamic components of climate-resilient, energy-efficient building envelopes.
PRESS RELEASE: Windows are vital to buildings because they provide daylight, views, and a connection to the outdoors, but they are also weak points in the building envelope. They can cause significant unwanted heat gain or heat loss, increasing the demand for heating, ventilation, and air conditioning.
Thermochromic smart windows offer a passive solution. These windows use materials that change their optical properties in response to temperature. In cold conditions, they remain more transparent, allowing daylight and solar heat into the building. In hot conditions, they reduce solar transmission, especially in the near-infrared region, helping to limit overheating and lower cooling loads. Because the response is temperature-driven, they can operate without external power, sensors, or complex control systems.
A new review article published in Science Bulletin, titled “Thermochromic smart windows toward climate-resilient and energy efficient buildings: from lab to applications,” provides a comprehensive assessment of this technology. The study was conducted by Weiqiang Ma, Sai Liu, Junqi Wang, Fariborz Haghighat, and Shi-Jie Cao from Southeast University and Concordia University.
The review summarizes major thermochromic material systems, including vanadium dioxide, halide perovskites, hydrogels, liquid crystals, and ionic liquids. Each has advantages, such as near-infrared modulation, strong optical switching, or tunable transition temperatures. However, they also face challenges including high switching temperature, color change, haze, moisture sensitivity, mechanical fatigue, and long-term instability.
According to the authors, the key challenge is no longer only finding better materials, but translating material-level performance into reliable building-scale applications. Smart windows must balance visible transparency, solar modulation, thermal-infrared regulation, switching temperature, response speed, durability, and aesthetics. Their benefits also depend strongly on climate, façade orientation, building type, and glazing design. They may be especially useful in cooling-dominated regions, while in heating-dominated climates inappropriate switching could reduce useful winter solar gains.
The review calls for a shift from material-centered optimization to deployment-oriented design. Future thermochromic smart windows should be integrated with building energy management, HVAC, lighting, and shading systems. Rather than simply being “glass that changes color,” they could become dynamic components of climate-resilient, energy-efficient building envelopes.