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With the ever-growing need to reduce energy consumption, building materialsthat passively heat or cool are gaining importance. However, many buildingsrequire both heating and cooling, even within the same day. To date, fewtechnologies can automatically switch between passive heating and cooling, andthose that can require a large temperature range to cycle states (>15o C),making them ineffective for daily switching. We present a passively adaptiveradiative switch that leverages the expansion in phase-change energy storagematerials to actuate the motion of louvers and can cycle states in less than 3oC. The black selective-absorber louvers induce high heat gain when closed, yetwhen open, expose a white, emissive surface for low heat gain. During anoutdoor test in which temperature was held steady, our device reduced theenergetic cost of cooling by 3.1x and heating by 2.6x compared to non-switchingdevices. Our concept opens the door for passively adaptive thermoregulatingbuilding materials.

Passively Adaptive Radiative Switch for Thermoregulation in Buildings