Mathis Degeorges , Jyothis Anand , Yung Chak Anson Tsang , Zhenpeng Li , Nithin Jo Varghese , Jyotirmoy Mandal
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Beyond cooling: Radiative thermoregulation in the Earth’s glow with micropatterned directional emitters
We demonstrate a micropatterned directional emitter (μDE) with an ultrabroadband directional thermal emittance. The μDE enables a previously unexplored passive seasonal thermoregulation of buildings by reducing terrestrial heat flows. μDEs with metallic and white appearances can be made using low-cost materials and scalable manufacturing techniques and have their directional emittance geometrically tailored to different urban scenarios. We also show a novel, visibly transparent variant. In outdoor experiments, μDEs stay 1.53°C to 3.26°C cooler than traditional omnidirectional building envelopes in warm weather and up to 0.46°C warmer in cold weather. Additionally, our μDEs demonstrate significant cooling powers of up to 40 W.m−2 in warm conditions and heating powers of up to 35 W.m−2 in cool conditions relative to typical building envelopes. A building energy model shows that μDEs can achieve all-season energy savings similar to or higher than those of cool roofs. Collectively, our findings show μDEs as highly promising for thermoregulating buildings.
期刊介绍:
Joule is a sister journal to Cell that focuses on research, analysis, and ideas related to sustainable energy. It aims to address the global challenge of the need for more sustainable energy solutions. Joule is a forward-looking journal that bridges disciplines and scales of energy research. It connects researchers and analysts working on scientific, technical, economic, policy, and social challenges related to sustainable energy. The journal covers a wide range of energy research, from fundamental laboratory studies on energy conversion and storage to global-level analysis. Joule aims to highlight and amplify the implications, challenges, and opportunities of novel energy research for different groups in the field.