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US 11,885,576 B2Granted
Structures for radiative cooling
AssigneeThe Board of Trustees of the Leland Stanford Junior University
InventorsAaswath Pattabhi Raman, Shanhui Fan, Eden Rephaeli
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Abstract
Various aspects as described herein are directed to a radiative cooling device and method for cooling an object. As consistent with one or more embodiments, a radiative cooling device includes a solar spectrum reflecting structure configured and arranged to suppress light modes, and a thermally-emissive structure configured and arranged to facilitate thermally-generated electromagnetic emissions from the object and in mid-infrared (IR) wavelengths.
Claims19
An apparatus comprising:
- a radiative cooling device having
- an ultraviolet reflector comprising a multi-layer stack including a plurality of material layers to prohibit coupling of incoming electromagnetic radiation to a portion of the radiative cooling device, the ultraviolet reflector including a metallic layer and a dielectric layer;
- and
- a thermal emitter to generate electromagnetic emissions from the radiative cooling device;
- and
- a heat exchanger to exchange heat between the radiative cooling device and a load.
3 more elements
An apparatus comprising:
- a radiative cooling device having
- an ultraviolet reflector comprising a multi-layer stack including a plurality of material layers to prohibit coupling of incoming electromagnetic radiation to a portion of the radiative cooling device;
- and
- a thermal emitter to generate electromagnetic emissions from the radiative cooling device;
- and
- a heat exchanger to exchange heat between the radiative cooling device and a load, wherein the multi-layer stack includes:
- a first set of layers comprising layers of TiO2 having a thickness of 25 nm and layers of MgF2 having a thickness of 35 nm;
- a second set of layers comprising layers of TiO2 having a thickness of 50 nm and layers of MgF2 having a thickness of 70 nm;
- and
- a third set of layers comprising layers of TiO2 having a thickness of 75 nm and layers of MgF2 having a thickness of 105 nm.
7 more elements
An apparatus further comprising:
- a radiative cooling device having
- an ultraviolet reflector, comprising a multi-layer stack including a plurality of material layers, to prohibit coupling of incoming electromagnetic radiation to a portion of the radiative cooling device, and
- a thermal emitter to generate electromagnetic emissions from the radiative cooling device;
- and
- a heat exchanger to exchange heat between the radiative cooling device and a load;
- a metallic reflector;
- and
- at least one dielectric layer arranged on top of the metallic reflector.
5 more elements
An apparatus comprising:
- a radiative cooling device having
- an ultraviolet reflector, comprising a multi-layer stack including a plurality of material layers, to prohibit coupling of incoming electromagnetic radiation to a portion of the radiative cooling device, and
- a thermal emitter to generate electromagnetic emissions from the radiative cooling device;
- and
- a heat exchanger to exchange heat between the radiative cooling device and a load, wherein the thermal emitter includes a SiC grating layer comprising a plurality of square regions having a periodicity.
2 more elements
An apparatus comprising:
- a radiative cooling device having
- an ultraviolet reflector comprising a multi-layer stack including a plurality of material layers to prohibit coupling of incoming electromagnetic radiation to a portion of the radiative cooling device,
- a thermal emitter to generate electromagnetic emissions from the radiative cooling device;
- a heat exchanger to exchange heat between the radiative cooling device and a load;
- a quartz layer arranged at the top exposed to the incoming electromagnetic radiation;
- and
- the thermal emitter is arranged below the quartz layer, wherein when viewed with the incoming electromagnetic radiation arriving at a top portion, the ultraviolet reflector is arranged below the thermal emitter.
4 more elements
An apparatus comprising:
- a radiative cooling device having
- an ultraviolet reflector comprising a multi-layer stack including a plurality of material layers to prohibit coupling of incoming electromagnetic radiation to a portion of the radiative cooling device,
- a thermal emitter to generate electromagnetic emissions from the radiative cooling device,
- a layer of Ag arranged below the ultraviolet reflector, wherein when viewed with the incoming electromagnetic radiation arriving at a top portion, the ultraviolet reflector is arranged below the thermal emitter;
- and
- a heat exchanger to exchange heat between the radiative cooling device and a load.
3 more elements
An apparatus comprising:
- a radiative cooling device having
- an ultraviolet reflector comprising a multi-layer stack including a plurality of material layers to prohibit coupling of incoming electromagnetic radiation to a portion of the radiative cooling device, and
- a thermal emitter to generate electromagnetic emissions from the radiative cooling device;
- and
- a heat exchanger to exchange heat between the radiative cooling device and a load, wherein the radiative cooling device is configured to achieve a temperature below an ambient temperature under solar irradiance.
2 more elements
A radiative cooling device comprising:
- a first portion having a metallic portion in thermal contact with an object to be cooled;
- a second portion arranged on top of the first portion and comprising an ultraviolet reflector including a multi-layer stack having a plurality of material layers, to prohibit coupling of incoming electromagnetic radiation to a portion of the radiative cooling device, the ultraviolet reflector including a metallic layer and a dielectric layer;
- and
- a third portion a thermal emitter arranged on top of the second portion and configured to generate electromagnetic emissions from the radiative cooling device.
1 more element
Dependencies are inferred from the claim text.