Abstract:
Provided are: a heat exchanger surface treatment method whereby it is possible to form a hydrophilic film exhibiting extremely high hydrophilicity (superhydrophilicity) and therefore also having excellent maintenance of hydrophilicity as well as excellent adhesion of the hydrophilic film and a metal surface in a state in which moisture adheres to the hydrophilic film; an aluminum fin material in which a hydrophilic film is formed on the surface of a fin by the aforementioned method; and an aluminum heat exchanger which uses the aluminum fin material. In the present invention, a metal surface is coated with a hydrophilic film using a hydrophilizing treatment agent containing a hydrophilic resin and crosslinking microparticles, and containing a specific (meth)acrylic resin, polyvinyl alcohol, and a polyalkylene ether resin having a specific molecular weight as the hydrophilic resin, the blending of each component being adjusted in a specific range.
Abstract:
Provided is a hydrophilization treatment agent for an aluminum-containing metal material, for forming a film that can provide excellent hydrophilicity and hydrophilic sustainability, as well as odor property to an aluminum-containing metal material for use in a heat exchanger or the like. The hydrophilization treatment agent for an aluminum-containing metal material contains: organic-inorganic composite particles obtained by combining a water-soluble resin (A) having a hydroxyl group, a poorly water-soluble inorganic oxide (B), an organoalkoxysilane (C), and a surfactant (D) at specific ratios; and water, and the organic-inorganic composite particles are 40 to 100 mass% based on total solid content by mass.
Abstract:
A passive radiative cooling system in which an ultra-black emitter includes metamaterial nanostructures disposed on the top surface of a metal sheet, and a conduit structure channels the flow of coolant against a bottom surface of the metal sheet. The metamaterial nanostructures (e.g., tapered nanopores) are configured to dissipate heat from the coolant in the form of emitted radiant energy having wavelengths/frequencies that fall within known atmospheric transparency windows (e.g., 8-13µm or 16-28µm), the emitted radiant energy being transmitted through a reflective layer into cold near-space. The ultra-black emitter is formed using a modified Anodic Aluminum Oxide (AAO) self-assembly technique followed by electroless plating that forms metal-plated tapered nanopores, and the reflective layer includes a distributed Bragg reflector. The cooling system is made scalable by way of modular cooling units (modules) that are configured for connection in series and parallel to form dry cooling systems suitable for large power plants.
Abstract:
Provided is a heat dissipating sheet. The heat dissipating sheet includes a metal layer having a first surface and a second surface, at least one graphene layer having a first surface and a second surface, wherein the second surface of the graphene layer comes in contact with the first surface of the metal layer, a protective layer comprising (a) a substrate layer having a first surface and a second surface, wherein the second surface of substrate layer comes in contact with the first surface of the graphene layer, and (b) a pigment layer coming in contact with the first surface of the substrate layer, an adhesive layer having a first surface and a second surface, wherein the first surface of the adhesive layer comes in contact with the second surface of the metal layer, and a release layer coming in contact with the second surface of the adhesive layer, wherein the heat dissipating sheet has a thermal conductivity of 70 W/m·K or more in a horizontal direction.
Abstract:
Methods, plate elements and heat/enthalpy exchangers. a) perforating an unformed plate element with defined outer dimensions in any desired area and in any desired dimension; b) covering at least one side of the unformed plate element with a thin polymer film with latent energy exchange characteristics and; c) forming the plate element into a desired shape and a pattern of corrugations and/or embossing. The operations b) and c) may be performed in a different order. For instance, when the plate element is made out of plastic, b) may be performed before c) whereas, when the plate element is made out of aluminum (or plastic), c) may be performed before b). Operations a) and/or b) and/or c) may also, in certain embodiments, be combined.
Abstract:
L'invention porte sur un dispositif de camouflage (1) infrarouge et sur un véhicule comportant un tel dispositif qui comporte un réseau de canalisations (4,6) parallèles transportant un fluide caloporteur (20) destiné à modifier la signature thermique d'un véhicule. Ce dispositif (1) est caractérisé en ce qu'il comporte un collecteur d'amenée (3), un collecteur intermédiaire (5), une première série de premières canalisations (4) raccordant le collecteur d'amenée (3) et le collecteur intermédiaire (5), une seconde série (6) de secondes canalisations (6a) reliant le collecteur intermédiaire (5) et un collecteur de sortie (7), chaque première canalisation (4) étant située au voisinage d'une seconde canalisation (6) de manière à former au niveau du dispositif (1) une alternance de premières (4) et secondes (6) canalisations parallèles, le collecteur (3) d'amenée et le collecteur de sortie (5) étant voisins l'un de l'autre.
Abstract:
Provided is a heat-radiating sheet including a heat-radiating layer having a porous structure with multiple pores, a filler including multiple thermally conductive particles and filling the pores inside the heat-radiating layer, and an adhesive layer disposed on at least one surface of the heat-radiating layer.