262results about How to "High heat storage density" patented technology

The invention relates to a medium-high temperature (120-1000 DEG C or higher) composite structural heat storage material. The medium-high temperature composite structural heat storage material comprises an inorganic salt phase change latent heat material, a sensitive heat storage material and a heat conduction reinforcing material, wherein the mass ratio of the inorganic salt phase change latent heat material to the sensitive heat storage material is of 1: (0.1-10); and the heat conduction reinforcing material is of 0.0001-1kg/ (kg heat storage material) based on mass ratio. The preparation method comprises steps as follows: uniformly mixing the inorganic salt phase change latent heat material with the sensitive heat storage material and the heat conduction reinforcing material; pressurizing to form green blank; and then heating and sintering, so as to obtain the medium-high temperature composite structural heat storage material. The medium-high temperature composite structural heat storage material provided by the invention is capable of obviously reducing the corrosion resistance of the sensitive heat storage material; meanwhile, the thermal conductivity of the composite heat storage material is markedly improved by virtue of the micro-nano doping of the heat conduction reinforcing material; and moreover, high heat storage density is achieved, and wide application prospect is provided.

The invention relates to a foam metal composite phase-change material and a preparation method thereof, and belongs to the technical field of phase-change energy storage materials. A crystallized hydrated salt-foam metal composite phase-change energy storage material is prepared by adopting the adsorption characteristic of a porous foam metal skeleton structure, and a vacuum argon filling state is kept in a preparation process, so that impurities are prevented from entering, and the quality of a product is ensured. The phase-change material is relatively uniformly and sufficiently distributed in a substrate of the foam metal skeleton material, and the shaping characteristic of the composite material is maintained under the combined action of a capillary force and surface tension of foam metal, so that the phase-change material does not leak easily in a phase-change process, and the preparation method of the phase-change material is simple and convenient, high in recombination rate and good in operability. The composite phase-change material has the advantages of high phase-change latent heat in unit volume, high heat storage and release rates, good heat-conducting property, lower supercooling degree, and the like; and the lower heat conductivity and supercooling problems existing after the crystallized hydrated salt phase-change material is applied for a long time are solved effectively.

The invention discloses a low-phase-transition-temperature heat storage material and a preparation method thereof. The low-phase-transition-temperature heat storage material comprises the following components in parts by weight: 55 to 93 parts of sodium acetate trihydrate, 1 to 40 parts of a temperature regulator, 2 to 6 parts of deionized water, 1 to 2 parts of a thickener, and 2 to 3 parts of a nucleating agent. The phase transition heat storage material provided by the invention has the adjustable phase transition temperature of 35 to 56 DEG C, and the phase transition latent heat of 200 to 280 kJ/kg. The application temperature range of a sodium acetate trihydrate system is expanded, and the phase transition heat storage material provided by the invention belongs to solid-liquid phase transition, has high heat storage density and can be effectively applied to the field of civil life.

The invention is directed at articles and devices for thermal energy storage, and for process of storing energy using these articles and devices. The articles comprise a capsular structure 10 having one or more sealed spaces 14, wherein the sealed spaces encapsulate one or more thermal energy storage materials 26: wherein the capsular structure has one or more fluid passages 16 which are sufficiently large to allow a heat transfer fluid to flow through the one or more fluid passages; and when a heat transfer fluid contacts the capsular structure 10 the thermal energy storage material 26 is Isolated from the heal transfer fluid. The devices include two or more articles arranged so that a fluid, such as a heat transfer fluid, may flow through the fluid passage 16 of an article before or after flowing through a space between two of the articles.

The invention specifically relates to a composite phase-change heat storage brick coated by a refractory material, belonging to the field of energy storage materials. A composite phase-change heat storage material composed of an inorganic phase-change material and a ceramic material is coated by the refractory material with a certain thickness; the composite phase-change heat storage material is a standard brick, common brick or special-shape brick with a certain size and a certain shape; and highly-heat-conducting materials like amorphous graphite, crystalline flake graphite, carbon fibers, carbon nanotubes and copper slag are added into the composite phase-change heat storage material and the refractory material. The composite phase-change heat storage brick coated by the refractory material meets the requirements of a heat storage medium for high heat storage capability and good heat conduction capability and improves the strength, heat storage stability and long-term operation reliability of the heat storage material. The composite phase-change heat storage brick coated by the refractory material makes full use of sensible heat and latent heat heat-storage methods, can effectively the efficiency of energy utilization, protectes the environment and has critical application prospects in fields like utilization of solar heat, storage of off-peak electricity, recycling of industrial waste heat and energy conservation of industrial and civil buildings and air-conditioners.

The invention relates to a phase-change heat storage material, in particular to a composite phase-change heat storage material with sodium sulfate decahydrate as a main body. The composite phase-change heat storage material disclosed by the invention overcomes the defects of small heat capacity, low thermal conductivity, poor stability and the like of the traditional well-know phase-change material; a brand-new composite phase-change heat storage material is formed by co-melting sodium sulfate, sodium carbonate, sodium borate, polycarboxylic acid, water used as a heat storage agent of the material, a temperature regulator, a crystallization nucleating agent, a suspension thickener and a raw material solvent; the composite phase-change heat storage material has the advantages of high heat capacity, proper phase-change temperature, high thermal conductivity, difficulty in generation of super-cooling phenomenon and the like; the heat storage material not only is suitable for daily heating requirements of organizations, enterprises, troops, families and the like, but also is applicable to special occasions such as high altitude, polar regions, oceans, desert, highland and mountainous areas with large temperature difference between day and night; in addition, the composite phase-change heat storage material disclosed by the invention has the characteristics of simple implementation, simple and easy manufacturing, durability, broad market prospect, and higher economic added value and social application value.

The invention discloses sodium sulfate decahydrate phase change energy storage material compositions. The compositions mainly comprises sodium sulfate decahydrate, a nucleating agent, a thickening agent and the like; and the phase change temperature is between 30 and 32 DEG C, the degree of supercooling is less than 3 DEG C and the phase change latent heat is more than 220kJ/kg. The compositions have quite good phase change stability and have passed 3,000 times of cold and heat cycle tests; moreover, the uniformity of the phase change system can be maintained for a long time.

The invention provides a preparation method of a high-temperature phase-change thermal storage type composite catalyst carrier. A metallic compound and gelatin are sampled according to the mass ratio of 0.5-1 to 1-2, then are dissolved into water according to the solid-to-liquid ratio of 1.5-3 to 100-150, then aluminum powder is added according to the mass ratio that the metallic compound to aluminum powder is 0.5-1 to 1-2 under a stirring condition until being dispersed in the solution completely, a NH4F solution with the concentration of 0.2 to 0.25 mol/L is dripped at the speed of 5 to 8mL per minute after the temperature of the solution reaches 40 DEG C, filtering is performed after reaction for 15 min, water is used for washing sediment for three times, after constant-temperature drying at 100 DEG C, and obtained powder is roasted for 20 to 30 min at the temperature of 100 DEG C, namely the high-temperature phase-change thermal storage type composite catalyst carrier is obtained. According to the invention, the sintering-resisting capability of the catalyst is improved, and the stabilizing of the reactivity of the catalyst is also facilitated on the other hand. Two functions of catalyzing and thermal storing are combined, the obtained material can absorb and emit heat in a position near a phase change point, high-density heat storage is achieved, and the stability during the process of catalytic reaction is ensured.

The invention provides a cellulose-based flexible heat storage composite material and a preparation method thereof, and the preparation method comprises the following steps: uniformly mixing an oil phase and a water phase to obtain an oil-in-water type high internal phase emulsion, wherein the oil phase is an organic phase change material, the water phase comprises a water-soluble emulsifier, a cellulose suspension and water; adding a cross-linking agent and a catalyst into the oil-in-water type high internal phase emulsion, realizing interfacial polymerization of the cellulose emulsion through heating, forming a cross-linked polymer at an interface, and obtaining the heat storage composite material through heating drying and freeze drying. The appearance of the heat storage composite material can be controlled through a mold for containing the high internal phase emulsion during polymerization, a nanofiber structure is arranged in the heat storage composite material, the heat storage density of the material after heating and drying can reach 200 J/g, the heat storage density of the material after freeze drying can reach 250 J/g, and the heat storage composite material has flexibility, can be curled and folded at the room temperature and the temperature of 40 DEG C or above and is good in heat conduction performance.

The invention discloses an engine cold-start preheating device. A heat storing heat exchanger (3) is in a parallel connection with an exhaust pipe (2) of an engine (1), the heat storing heat exchanger (3) is used for storing exhaust air waste heat of the engine (1), the heat storing heat exchanger (3) is in a columnar structure, a plurality of heat storing units are distributed in the heat storing heat exchanger (3), each heat storing unit is a concentric casing pipe (7) which comprises an inner pipe and an outer pipe, a phase change thermal storage material (8) is encapsulated in annular space between the inner pipe and the outer pipe, two ends of the inner pipe are welded on two flow guide plates (9) respectively, a hollow cavity for enabling cooling water of the engine (1) to flow through is formed by the two flow guide plates (9) and inner walls of the heat storing heat exchanger (3), and the inner walls of the heat storing heat exchanger (3) are located between the two flow guide plates (9). The engine cold-start preheating device has the advantages of being low in costs, small in size, efficient, energy-saving and convenient to popularize and use in a wide range.

The invention discloses a preparation method of a sizing composite heat storage material for moderate-high temperature, comprising the following steps: treating vermiculite under the temperature of 1300 DEG C for 20min, cooling, and mixing with phase change materials according to a mass ratio of 1 to 10, wherein the phase change materials consist of MgCl2, KCl and NaCl, and the sum of the phase change materials is 100 percent; preserving the heat of the mixture for 6h under the conditions of 400 DEG C and negative pressure of -15kPa, preparing a composite phase change material, mechanically crushing the composite phase change material into 40 meshes, adding modified carbon fiber, and then mechanically mixing for 24h, wherein the mass of the modified carbon fiber accounts for 2-8 percent of the total mass of the composite phase change material; dropwise adding a high temperature binder, performing compression moulding under the pressure of 10-20MPa, and finally preserving heat under the temperature of 300 DEG C for curing, thus obtaining the sizing composite heat storage material for moderate-high temperature. The sizing composite heat storage material is reasonable in material selection, strong in heat conductivity, high in heat storage density and wide in base material source, and the prepared sizing composite heat storage material has better heat stability, little leakage possibility and better application prospect.

The invention discloses a two-layer variable ball diameter packed bed heat storage device and provides a preparation method of a heat storage ball. A large-diameter heat storage ball is arranged on the upper layer of the packed bed heat storage device, and a small-diameter heat storage ball is arranged on the lower layer of the packed bed heat storage device. The packed bed heat storage structurecomprehensively considers two important evaluation indexes of the heat storage device, namely heat storage rate and heat storage density, the maximum heat storage rate of the packed bed heat storage device serves as a design principle, and an optimal combination of diameters of the heat storage balls in the packed bed is obtained by virtue of an optimization design, so that the heat storage devicehas optimal heat storage performance. According to the preparation method of the heat storage ball provided by the invention, the heat storage ball with advantages of high heat storage density, excellent heat-conducting property, high mechanical strength, excellent sealing property and simple preparation process can be prepared.

The invention discloses a heat conduction enhanced organic PCM (phase change material). The heat conduction enhanced organic PCM is prepared from an organic PCM containing nano-particles as a core material and a porous material as a wall material, wherein the nano-particles are boron nitride, CNTs (carbon nano tubes), expanded graphite and graphene oxide. A preparation method of the heat conduction enhanced organic PCM comprises the following steps: 1) a process of emulsifying the organic PCM; 2) a process of adsorbing the organic PCM containing the nano-particles by the porous material undera vacuum condition; and 3) a process of taking out a product obtained after vacuum adsorption. The heat conduction enhanced organic PCM has the advantages that 1) the heat response speed is high, i.e.the heat conduction property is high; 2) the heat accumulation density is high; 3) the heat cycling stability is high; and 4) raw materials are safe, non-toxic and non-corrosive, and the technical characteristics of being simple in preparation process and low in cost are achieved. Therefore, the heat conduction enhanced organic PCM is better in heat conductivity and stability, the using ratio ofenergy sources is improved, and the application prospect is wide.

Belonging to the technical field of ceramic materials, the invention provides a high temperature phase change heat storage material. The high temperature phase change heat storage material is preparedby the steps of: first, mixing quartz sand powder, corundum powder, copper oxide and zinc oxide evenly in proportion, conducting compression moulding, and then performing heat treatment to obtain a sieving material A; second, mixing the sieving material A, carbon black, silicon powder and aluminum oxalate evenly in proportion, and performing heat treatment to obtain an abrasive B; and third, mixing corundum particles, corundum powder, the abrasive B, aluminum-silicon alloy, silicon powder, silicon carbide powder and thermosetting phenolic resin evenly in proportion, conducting compression moulding, and then performing heat treatment to obtain a finished product. The high temperature phase change heat storage material prepared by the method provided by the invention has a working temperature above 600DEG C, and has the characteristics of large heat storage density, high heat conductivity coefficient, high compressive strength, high thermal shock stability, low production cost, simple process and the like.

The invention relates to a solid-state heat storage and heating characteristic matching design method based on heat transfer rate balance, which comprises the following steps of 1) obtaining structural data, material data and operating condition parameters of a high-temperature solid-state heat storage device; 2) establishing a heat transfer rate balance model between that high-temperature heat storage material and the electric resistance heating element; 3) establishing a heat transfer model between the high-temperature heat storage material and the electric resistance heating element according to the heat transfer rate balance model; 5) determining a heat transfer couple boundary condition between the air and the surface of the electric resistance heating element; 6) judging whether thesurface temperature of the electric resistance wire is in an operating temperature range. 7) obtaining the air inlet velocity parameter satisfying the design structure of the air duct of the regenerator and the operation temperature range, so that the structure and the performance of the electric heat element and the heat storage device are matched, thereby realizing the optimization of the wholestructure. (1) The rate of change of temperature is constant, according to which the heat transfer equilibrium equation can be calculated. (2) The heat storage material and the resistance wire match.(3) The shortening of the life of the electric heating element caused by the high temperature brittleness is avoided.

The invention provides a biomorphic silicon carbide ceramic high-temperature photo-thermal storage material and a preparation method thereof. The heat storage material is prepared by compounding a biomorphic silicon carbide ceramic framework and chlorate. The biomorphic silicon carbide ceramic is a ceramic material generated by high-temperature reaction of molten silicon and a charcoal porous precursor, and silicon carbide ceramic frameworks with different porosities can be obtained by different wood precursors. The phase-change heat storage material is prepared by fully and uniformly mixing sodium chloride and potassium chloride in a ball mill and drying to obtain the sodium-potassium chloride eutectic salt. The biomorphic silicon carbide ceramic framework is coated with the phase changeheat storage material by adopting a vacuum impregnation method, so that pores of the ceramic framework are filled with the phase change material, thereby obtaining the biomorphic silicon carbide ceramic high-temperature photo-thermal storage material. The composite material prepared by the invention has the excellent characteristics of high thermal conductivity (116 W/mK), high spectral absorptionperformance (92%) and high heat storage density (453 kg/kJ), and is expected to promote the development of constructing a clean, low-carbon, efficient and safe energy system.

The invention discloses a thermochemical energy storage system. The thermochemical energy storage system comprises a light focusing and tracking system, an endothermic reaction system, a first sealedstorage tank system, a second sealed storage tank system, a third sealed storage tank system, a heat releasing reaction system and a heat utilization system, wherein the light focusing and tracking system focuses and projects sunlight to the endothermic reaction system, the endothermic reaction system performs endothermic chemical reactions, gas and solid products generated by the chemical reactions of the endothermic reaction system are stored inside the third sealed storage tank system and the second sealed storage tank system correspondingly to be taken as reactants of the heat releasing reaction system, and the heat releasing reaction system performs heat releasing chemical reactions and delivers released heat to the heat utilization system and stores the products generated by the chemical reactions inside the first sealed storage tank system to be taken as the reactants of the endothermic reaction system at the same time. By means of the thermochemical energy storage system, solarphoton energy is directly supplied to heat storage material particles, the internal temperature of the heat storage material particles is distributed evenly, the heat storage material sintering resistance is improved, and the system circulation stability is improved.

The invention relates to a distributed energy resource station absorption type cold storage and heat storage dual-purpose energy storer. The energy storer comprises a heat exchanger with dual uses of a condenser and an evaporator, a heat exchanger with dual-use of a reactor and a absorber, a cooling agent storage tank and an absorbing agent storage tank, wherein a thermal separation baffle is used for separating the bottoms of the heat exchanger with the dual uses of the condenser and the evaporator and the heat exchanger with the dual uses of the reactor and the absorber, the upper portions of the heat exchanger with the dual uses of the condenser and the evaporator and the heat exchanger with the dual uses of the reactor and the absorber are communicated with each other, heat exchange tubes of the two heat exchangers are each communicated with a piping system of the distributed energy resource station through pipelines, the cooling agent storage tank is connected with the heat exchanger with the dual uses of the condenser and the evaporator to form a circulation loop through pipelines, and the absorbing agent storage tank is connected with the heat exchanger with the dual uses of the reactor and the absorber to form a circulation loop through pipelines. Compared with the prior art, by means of a absorption heat chemical reaction, energy storage of waste heat of distributed energy resource station generator sets is achieved; when cold supply is needed, cooling quantity is released; when heat supply is needed, heat quantity is released. Accordingly, a function with dual uses of accumulation of cold and accumulation of heat is achieved.