Dynamic radiation regulations for thermal comfort

Thermal comfort has a substantial implication for human health. Achieving thermal comfort requires not only thermal regulation of the building's macroenvironment, but also personal thermal management. Radiative cooling, which could pump thermal radiation through atmospheric window, is a promising passive cooling option in energy-efficient green buildings and personal thermal management. However, these fixed and monofunctional properties cannot adapt to highly dynamic weather and even result in overcooling. Therefore, it is necessary and urgent for dynamic radiation regulations (DRR). In this review, an overview is presented about latest technological advances and the prospects in this burgeoning field. First, the fundamental principles of DRR are presented. Then the emerging materials and strategies of DRR are introduced, adapting to the varying environment under the external stimuli like electricity, strain, temperature, etc. Afterwards, we present the latest applications of DRR in energy-efficient green buildings and personal thermal management, particularly the smart windows and dynamic responsive textiles. Finally, the challenges and opportunities of DRR are presented and future directions are identified.