Researchers have developed new multifunctional windows combining solar power generation and thermal insulation to improve energy efficiency and comfort in buildings.
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Buildings account for more than a third of global energy use, with inefficient windows often to blame for significant heating and cooling losses. The multifunctional window offers a transformative answer. These innovative windows combine solar panels and advanced selective liquid filters to both generate electricity and heat, provide daylighting, and improve indoor thermal insulation, turning windows into energy-saving building envelopes.
A team of researchers from Khalifa University’s Mechanical and Nuclear Engineering Department, led by Dr. Mohamed Hassan Ali, has developed a multifunctional window that takes full advantage of solar spectrum, improves power generation, decreases energy consumption for air conditioning, stabilizes thermal performance, and boosts indoor comfort. The team tested their window in tough weather conditions and demonstrated “outstanding performance”. They published their results in Applied Energy, a top 1% journal.
“These windows are a leap forward in green building design,” Dr. Ali said. “They don’t just save energy; they actively produce it while improving indoor comfort.”
Semi-transparent photovoltaic cells harness sunlight to produce electricity while selective liquid filters absorb unwanted heat and let visible light through. Together, these components balance energy generation and indoor comfort, reducing heating, cooling and lighting demands in buildings.
Simulations and experiments reveal that multifunctional windows outperform traditional windows, providing up to four times more energy efficiency in hot climates. They stabilize indoor temperatures, reduce solar heat gain and enhance daylight use, making them ideal for high-rise buildings and zero-energy designs.
“Our new multifunctional windows transform the way we think about building design. They generate electricity, conserve energy, and enhance comfort—all while making the most of the solar spectrum.”
— Dr. Mohamed Ibrahim Ali, Associate Professor, Mechanical & Nuclear Engineering, Khalifa University.
The researchers also explored different configurations, including adaptations for winter climates, showing that the windows can direct heat indoors during colder months. This adaptability makes multifunctional windows a versatile solution for year-round energy savings.
“This innovation brings us closer to the vision of zero-energy buildings,” Dr. Ali said. “It’s not just about utilizing solar energy; it’s about turning every window into a tool for sustainability.”
Despite their promise, the technology faces hurdles such as material durability and high production costs. Future work will focus on addressing these challenges, paving the way for broader adoption in residential and commercial buildings.
Jade Sterling
Science Writer
