Abstract:
Passive radiative cooling structures and apparatus manufactured with such cooling structures conserve energy needs. A flexible film transparent to visible light incorporates particles at a volume percentage larger than 25% so as to absorb and emit infrared radiation at wavelengths where Earth's atmosphere is transparent. Another film transparent to visible light is thin and flexible and configured to absorb and emit infrared radiation at wavelengths where Earth's atmosphere is transparent, wherein etchings or depositions are present on one or both surfaces. A high efficiency cooling structure has an emissive layer sandwiched between a waveguide layer and a thermal conductive layer. A solar cell panel is covered by a transparent passive radiative cooling film. A container housing an active cooling unit incorporates passive radiative cooling structures on one or more exterior surfaces.
Abstract:
A gel particle film of amino group-having polymer compound particles has a large acid gas absorption amount and desorption amount per unit volume, and has a high acid gas absorption rate and desorption rate per unit mass, and further has high stability. A gas absorber having the gel particle film supported on a carrier is useful as an acid gas separation material having good energy efficiency.
Abstract:
An apparatus includes a heat exchanger configured to transfer heat to a fluid and to absorb heat from the fluid as the fluid flows between a warm end and a cold end of a cryocooler. The heat exchanger includes at least one section having a substrate of at least one allotropic form of carbon and a layer of nanoparticles on or over the substrate. The heat exchanger could include multiple sections, and each section could include one of multiple substrates and one of multiple layers of nanoparticles. The heat exchanger can further include pores through the multiple sections of the heat exchanger, where the pores are configured to allow the fluid to flow through the heat exchanger and to contact the substrates and the layers of nanoparticles. The nanoparticles could include at least one lanthanide element or alloy, and the substrate could include carbon nanotubes or graphene.
Abstract:
A passive radiative cooling system comprising: a plurality of modules, each said module including: an ultra-black emitter including a metal sheet and a plurality of metamaterial nanostructures arranged in an ultra-black metamaterial-based pattern on a first surface of the metal sheet, said plurality of metamaterial nanostructures being configured to emit radiant energy having wavelengths in the range of 8µm to 13µm; a reflective layer mounted on the first surface of the emitter layer and configured to reflect incident solar radiation; and a conduit structure disposed under the metal sheet emitter layer and configured to conduct a coolant between an inlet port and an outlet port such that thermal energy is conducted from the coolant through the metal sheet to said plurality of metamaterial nanostructures; and a flow control system configured to pass said coolant through said plurality of modules.
Abstract:
Thermally conductive materials comprising an olefin block composite and a thermally conductive filler, where the thermally conductive filler is present in an amount sufficient to increase the thermal conductivity of the olefin block composite relative to the olefin block composite in its neat state. Such thermally conductive materials can be used in various articles of manufacture, such as a thermal interface material or a molded heat dissipation component.
Abstract:
An apparatus includes a heat exchanger configured to transfer heat to a fluid and to absorb heat from the fluid as the fluid flows between a warm end and a cold end of a cryocooler. The heat exchanger includes at least one section having a substrate of at least one allotropic form of carbon and a layer of nanoparticles on or over the substrate. The heat exchanger could include multiple sections, and each section could include one of multiple substrates and one of multiple layers of nanoparticles. The heat exchanger can further include pores through the multiple sections of the heat exchanger, where the pores are configured to allow the fluid to flow through the heat exchanger and to contact the substrates and the layers of nanoparticles. The nanoparticles could include at least one lanthanide element or alloy, and the substrate could include carbon nanotubes or graphene.
Abstract:
The purpose of the present invention is to provide an aluminum-diamond composite that exhibits both high thermal conductivity and a coefficient of thermal expansion close to that of semiconductor devices, and that can suppress the occurrence of swelling, etc., of a surface metal layer portion even in actual use under a high load. Provided is an aluminum-diamond composite comprising 65-80 vol% of a diamond powder having a roundness of at least 0.94, for which a first peak in a volumetric distribution of grain size lies at 5-25 µm, and a second peak lies at 55-195 µm, and a ratio between the area of the volumetric distribution of grain sizes of 1-35 µm and the area of the volumetric distribution of grain sizes of 45-205 µm is from 1 : 9 to 4 : 6; the balance being composed of a metal containing aluminum.
Abstract:
The present invention provides a heat dissipation film having high mechanical strength and flexibility, which is obtained by laminating a heat emission layer excellent in heat dissipation by infrared radiation, electrical insulation, and heat resistance on a metal film having excellent heat transfer efficiency. The present invention also provides a dispersion for heat emission layers for use in the production of the heat dissipation film, a method for producing a heat dissipation film using the dispersion for heat emission layers, and a solar cell including the heat dissipation film. The present invention provides a heat dissipation film including a heat transfer layer; and a flexible heat emission layer laminated on the heat transfer layer, the heat transfer layer being a metal film, the heat emission layer containing a water-insoluble inorganic compound and a heat-resistant synthetic resin, the amount of the water-insoluble inorganic compound in the heat emission layer being 30 to 90% by weight relative to the total weight of the heat emission layer, the heat emission layer having a thermal emissivity of at least 0.8 and a dielectric breakdown strength of at least 10 kV/mm.