31results about How to "High solar absorption rate" patented technology

The present invention relates to solar absorptive coatings including a ceramic material. In particular, the coatings of the invention are laser-treated to further enhance the solar absorptivity of the material. Methods of making and using such materials are also described.

The invention discloses a solar selective absorbing film series suitable for medium-high temperature heat usage and a preparation method of the solar selective absorbing film series suitable for the medium-high temperature heat usage. The solar selective absorbing film series comprises infrared high-reflective silver film plated on a metal base bottom, copper film, titanium aluminum nitrogen oxygen film, zinc tin antimony oxide film and silica film from top to bottom in sequence. Solar energy absorbance of the absorbing film series is larger than 96 percent, emittance is smaller than 2 percent, and the absorbing film series has the advantages of being super-low in emittance and high in photothermal conversion efficiency. Film plating rate of the zinc tin antimony oxide materials in the film series is high, and improvement of producing efficiency is benefited. The absorbing film series can be widely used in heat collectors of solar energy photothermal conversion, suitable for application of solar heat usage in construction integrated products, and especially suitable for wide application of medium-high temperature solar energy heat usage products. The solar selective absorbing film series suitable for medium-high temperature heat usage can be continuously plated on a base bottom with a large area through an industrialized magnetic control sputtering preparing method, and low-cost large-scale high-efficient producing is achieved.

The invention discloses a preparing method for a high-solar-energy-absorption-rate and high-emissivity black matt film on the surface of a titanium alloy, and relates to a preparing method for a ceramic film on the surface of the titanium alloy. The preparing method aims at solving the problems of the low solar energy absorption rate, the low emissivity and the low film and base-body binding force of an existing coating on the surface of the titanium alloy. The preparing method includes the steps of 1, carrying out titanium alloy pre-processing; and 2, carrying out micro-arc oxidation, and obtaining the high-solar-energy-absorption-rate and high-emissivity black matt film on the surface of the titanium alloy. As for the high-solar-energy-absorption-rate and high-emissivity black matt film, prepared with the preparing method, on the surface of the titanium alloy, the thickness ranges from 20 microns to 30 microns, the roughness ranges from 0.5 micron to 3 microns, the solar energy absorption rate ranges from 0.95 to 0.98, and the emissivity ranges from 0.93 to 0.97. The preparing method is used for preparing the high-solar-energy-absorption-rate and high-emissivity black matt film on the surface of the titanium alloy.

Disclosed is a spectrally selective solar absorbing coating and a method for making same. The spectrally selective solar absorbing coating includes a multilayer stack including, from the substrate to the air interface: substrate (1), infrared reflective layer (2), barrier layer (3), composite absorbing layer (4) consisting of metal absorbing sublayer (4.1), metal nitride absorbing sublayer (4.2), and metal oxynitride absorbing sublayer (4.3), and antireflective layer (5). Therefore, the solar absorbing coating has good high and low temperature cycle stability and superior spectrum selectivity, with a steep transition zone between solar absorption and infrared reflection zones. It has a relatively high absorptance α>95%, and a low thermal emissivity ∈≦4%, PC (performance criterion)=−0.3. The solar absorbing multilayer stack can be obtained by reactively magnetron sputtering the metal target in argon or other inert gas with some amounts of gas containing oxygen or nitrogen or their combination.

The invention provides an inorganic acid based collosol for preparing a solar energy photo-thermal conversion absorbing membrane: the collosol is prepared from the raw materials of organic or inorganic aluminium salt, nickel salt and chelating agent, wherein the raw materials are processed by the steps of alcoholysis and condensation reaction in ethanol or fatty alcohol, inorganic acid is used as peptizing agent for preparing aluminum collosol, and the aluminum collosol needs to be mixed with nickel collosol to prepare mixed collosol. The invention has the advantages of simple preparation method and easy raw material acquisition, the prepared membrane can be used for a thermal collection absorbing layer for the solar energy photo-thermal conversion, and the invention has low cost and does not pollute the environment.

The invention provides an application of a diamine compound containing a thiazole ring in preparing a solar heat-absorbing coating. The application comprises the following steps: under protection of argon, dissolving the diamine compound containing the thiazole ring in an organic solvent, and then adding a dianhydride monomer or a derivative thereof to carry out the polymerization reaction to obtain polyimide resin containing the thiazole ring; then, mixing the polyimide resin containing the thiazole ring with a pigment and a solvent, and then ball-milling and uniformly dispersing to obtain the coating. Test results show that the adhesive force of the coating prepared by the solar heat-absorbing coating is 4-5B, the solar absorptivity is 0.80-0.85, and the emissivity is 0.11-0.39. Therefore, the coating has higher solar absorptivity and lower emissivity, and can effectively improve the photothermal conversion efficiency of a solar heat collector. The coating has good mechanical property and strong weather resistance, and can be widely applied to the field of utilization of solar energy at medium and low temperature.

The invention discloses a preparation method of a high-entropy ceramic material with good light absorption performance, the preparation method comprises the following steps: taking any five of CuO, MnO2, Fe2O3, Cr2O3, Co3O4, TiO2, ZnO and MgO powder as raw materials, carrying out ball-milling mixing, drying and grinding, then carrying out high-temperature calcination in an air atmosphere, and then cooling and grinding to obtain high-entropy ceramic with a spinel structure. The high-entropy ceramic is prepared by combining a mechanical wet grinding method and a solid-phase synthesis method, metal elements can be sufficiently and uniformly mixed, the method has the advantages of simple preparation technology, high repeatability, high production efficiency, suitability for industrial production and the like, and the prepared high-entropy ceramic is single in phase, high in purity, small in particle size and uniform in element distribution, the material has high solar energy absorptivity and good thermal stability, and can ensure the photo-thermal conversion efficiency of a solar energy absorbing material as a solar energy absorbent.

The invention discloses a solar central water heating system with a heat accumulation function, which comprises a solar thermal collector array, a water tank, a collector circulating pump, a check valve, an electromagnetic valve and other parts. A heat accumulator filled with phase-change heat accumulation medium is arranged on the bottom in the water tank, and the interior of a heat accumulator core tube is a water passage. A heat accumulator water passage inlet is connected with the outlet of the solar thermal collector array, a heat accumulator outlet is directly open in the hot water storage tank, and the inlet of the solar thermal collector array is connected with the bottom of the hot water storage tank sequentially through the check valve and the collector circulating pump and connected with a tap water supply pipeline through the water-lifting electromagnetic valve. Both hot water heated by the solar thermal collectors and cold water replenished into the water tank first flow through the heat accumulator core tube and exchange heat with the heat accumulator. When the water temperature in the water tank is higher or lower than the phase change temperature of the heat accumulation medium in the heat accumulator, heat is released to the heat accumulator or heat is absorbed from the heat accumulator. By means of the heat absorption and release of the heat accumulator, energy consumption can be reduced, and solar radiation energy can be effectively utilized by the way of peak load shifting.

The invention discloses a high-toughness luminescent coating. Per 100 g of a base-material is added with the following components: 18-22 g of a luminescent powder, 5-8 g of a talcum powder, 3-6 g of a dispersing gent, and 1-2 g of an anti-settling agent. Per 100 g of the base-material comprises 60-65 g of acrylic resin and 35-40 g of polyurethane resin. Through the above mode, the coating provided by the invention gains enhanced adhesion stress, toughness, leveling property, super-strong adhesive force and light-storing capability, super-long luminescence time, and realizes uniform film, good leveling property and ideal luminescent effect.

The invention relates to a preparation method for a titanium alloy TA2 surface ceramic film layer, in particular to a preparation method for a titanium alloy TA2 surface high-solar absorptivity low-emissivity film layer, and aims to solve the problems that an existing titanium alloy TA2 surface coating is low in solar absorptivity, high in self emissivity, and low in bonding force of a film layer and a base body. The preparation method comprises the steps that 1, pretreatment is carried out on titanium alloy TA2; 2, micro-arc oxidation is carried out to obtain a titanium alloy TA2 surface high-solar absorptivity low-emissivity film layer. The thickness of the prepared titanium alloy TA2 surface high-solar absorptivity low-emissivity film layer ranges from 0.3 micron to 1 micron, the roughness of the film layer ranges from 0.2 micron to 0.25 micron, solar absorptivity ranges from 0.82 to 0.9, and emissivity ranges from 0.08 to 0.13. The titanium alloy TA2 surface high-solar absorptivity low-emissivity film layer can be obtained through the preparation method.

The present invention relates to the world's first apparatus for long-distance electrostatic spray of an agrichemical liquid for rice, wherein the mixture, obtained by mixing an agrichemical, a fertilizer, and an herbicide in water, is sprayed long-distance onto crops; spray droplets are negatively (-) charged by a DC high-voltage electrified ring to promote the adhesive strength to positively (+) charged rice leaves coated with wax; an agrichemical liquid is sprayed at a nozzle water pressure of about 16 kgf/cm2 such that the spray droplet diameter can be induced to 0.1-0.44 mm; the agrichemical liquid is sprayed in a diameter of 101 m or greater, so a user can easily and promptly spray the agrichemical liquid, without entering a rice paddy, from a farm road or ridge without agrichemical poisoning; and the purposes of pest control, such as producing high-quality flavorful rice and attaining maximum yields, can be achieved.

The invention discloses a solar vacuum pipe. The solar vacuum pipe comprises an outer glass pipe and an inner glass pipe, wherein the outer glass pipe and the inner glass pipe are concentric circularpipes; the nozzle part of the outer glass pipe and the nozzle part of the inner glass pipe are connected through a molten glass pipe; the tail part of the inner glass pipe is fixed on the outer glasspipe, and a vacuum interlayer is reserved between the inner glass pipe and the outer glass pipe; the outer surface of the inner glass pipe is coated with a compound absorption layer; the compound absorption layer is prepared from the following raw materials in parts by weight: 40-55 parts of resin, 10-15 parts of aluminum silver powder, 20-30 parts of solvent, 1-3 parts of antioxidant, 1-3 parts of a coupling agent and 1-3 parts of dispersant; and the resin is vinyl resin or furfuryl alcohol modified urea resin. The solar vacuum pipe has relatively remarkable solar absorption rate and cold-hotimpact resistance, is low in preparation cost, and is suitable for popularizing.