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materialsscienceandengineering:
Porous polymer coatings dynamically control light and heat
Buildings devote more than 30% of their energy use to heating, cooling, and lighting systems. Passive designs such as cool roof paints have gone a long way toward reducing this usage, and its impact on the environment and climate, but they have one key limitation—they are usually static, and thus not responsive to daily or seasonal changes.
Columbia Engineering researchers have developed porous polymer coatings (PPCs) that enable inexpensive and scalable ways to control light and heat in buildings. They took advantage of the optical switchability of PPCs in the solar wavelengths to regulate solar heating and daylighting, and extended the concept to thermal infrared wavelengths to modulate heat radiated by objects. Their work is published on October 21, 2019 by Joule.
“Our work shows that by wetting PPCs with common liquids like alcohols or water, we can reversibly switch their optical transmittance in the solar and thermal wavelengths,” says Jyotirmoy Mandal, lead author of the study and a former Ph.D. student in the lab of Yuan Yang, assistant professor of materials science and engineering. “By putting such PPCs in hollow plastic or glass panels, we can make building envelopes that can regulate indoor temperatures and light.”
Read more.
materialsscienceandengineering:
Porous polymer coatings dynamically control light and heat
Buildings devote more than 30% of their energy use to heating, cooling, and lighting systems. Passive designs such as cool roof paints have gone a long way toward reducing this usage, and its impact on the environment and climate, but they have one key limitation—they are usually static, and thus not responsive to daily or seasonal changes.
Columbia Engineering researchers have developed porous polymer coatings (PPCs) that enable inexpensive and scalable ways to control light and heat in buildings. They took advantage of the optical switchability of PPCs in the solar wavelengths to regulate solar heating and daylighting, and extended the concept to thermal infrared wavelengths to modulate heat radiated by objects. Their work is published on October 21, 2019 by Joule.
“Our work shows that by wetting PPCs with common liquids like alcohols or water, we can reversibly switch their optical transmittance in the solar and thermal wavelengths,” says Jyotirmoy Mandal, lead author of the study and a former Ph.D. student in the lab of Yuan Yang, assistant professor of materials science and engineering. “By putting such PPCs in hollow plastic or glass panels, we can make building envelopes that can regulate indoor temperatures and light.”
Read more.