196results about How to "Large latent heat of phase change" patented technology

The invention relates to a setting phase change energy storage material with high-thermal conductivity and a preparation method thereof, belonging to the field of phase change heat storage materials. The setting phase change energy storage material with high-thermal conductivity is characterized by containing 65-90 percent by mass of paraffin substances as a phase-change material, 9-34 percent by mass of high-density polyethylene as a support material and 1-7 percent by mass of expanded graphite as a heat conduction intensifier; a method for adding a proper amount of expanded graphite to paraffin/high-density polyethylene in a molten state is adopted to enable the heat conductivity of the setting phase change material to be increased to 1.35W/(m.K) or higher. The method comprises the following steps of: heating to melt the paraffin substances with the mass percent of 65-90 percent, and heating to enable the temperature of the liquid paraffin to reach 120-190 DEG C; adding high-density polyethylene with the mass percent of 9-34 percent and the expanded graphite with the mass percent of 1-7 percent to the liquid paraffin, and then melting and evenly stirring in vacuum; putting the mixture in a hot mould for pressing and molding; taking the mixture from the mould after naturally cooling. The setting phase change material has high thermal conductivity, does not need to be packaged in containers and can directly contact heat-transfer media.

Belonging to the technical field of heat storage and transfer, the invention provides a ternary nitric acid nano-molten salt heat transfer and storage medium, a preparation method and application thereof. The ternary nitric acid nano-molten salt heat transfer and storage medium contains a ternary nitric acid molten salt system formed by potassium nitrate, sodium nitrate and sodium nitrite. The ternary nitric acid nano-molten salt heat transfer and storage medium is characterized in that it also includes metal oxide nanoparticles and/or non-metal oxide nanoparticles. The nanoparticles are dispersed into the ternary nitric acid molten salt system to undergo compounding so as to form the ternary nitric acid nano-molten salt heat transfer and storage medium. The ternary nitric acid nano-molten salt involved in the invention has a low melting point, an upper limit use temperature up to 600DEG C, good thermal stability, and high heat conductivity, thus being very suitable for the heat storage and transfer system of industrial energy storage and solar-thermal power generation.

The invention provides a molten nano-carbonate heat transfer and accumulation medium, and a preparation method and an application thereof, and belongs to the technical field of heat storage and transmission. The molten nano-carbonate heat transfer and accumulation medium contains a molten carbonate system formed by potassium carbonate, sodium carbonate, lithium carbonate and sodium chloride, nanoparticles are added into the molten carbonate system, and the nanoparticles are metal oxide and/or nonmetal oxide; and the nanoparticles are dispersed into the molten carbonate system, and the molten nano-carbonate heat transfer and accumulation medium is formed through compounding. The melting point of molten nano-carbonate is low, so the molten nano-carbonate heat transfer and accumulation medium has an upper limit use temperature of 800DEG C, has a good heat stability and a high heat conductivity, and is very suitable for the heat accumulation and transfer systems of industrial energy accumulation and solar photo-thermal power generation.

The invention relates to a solenoid-drive liquid metallic rheostat which is characterized by comprising a casing, paraffin, a copper wire, a communicating vessel, liquid metal and an electromagnetic pump. The casing is filled with the paraffin and the copper wire; the communicating vessel is located on one side of the casing and is connected with one end of the copper wire; the electromagnetic pump is mounted at the bottom of the communicating vessel; and the liquid metal is stored in the communicating vessel, moves up and down under the driving of the electromagnetic pump and is contacted with the copper wire at different height positions, so that the length of the copper wire placed in a circuit is hanged and the variable resistance effect is achieved. The solenoid-drive liquid metallic rheostat takes the copper wire as the main body, utilizes the electromagnetic pump to drive the liquid metal to move to adjust the copper wire resistance, and adopts the paraffin to absorb joule heat, so that the whole system is stable and reliable, small in size, light in weight and low in cost, and can be widely applied to the field of soft starting of motors.

The invention discloses a heat-transfer heat-accumulation medium prepared by combining quartz sand and a ternary molten nitrate salt and a preparation method thereof, and belongs to the field of solar energy photo-thermal electricity generation. The heat-transfer heat-accumulation medium is composed of a ternary molten nitrate salt system and quartz sand. The invention also provides a preparation method of the heat-transfer heat-accumulation medium. The heat-transfer heat-accumulation medium basically does not change the freezing point of the ternary molten nitrate salt, also the upper limit operating temperature of the ternary molten nitrate salt is improved and is up to 750 DEG C. The heat-transfer heat-accumulation medium is good in thermal stability, high in thermal conductivity, low in cost and extremely suitable for solar energy thermal power electricity generation systems and solar energy photo-thermal electricity-generation heat-accumulation heat-transfer systems.

The invention provides n-tetradecyl alcohol phase-change microcapsule and a preparation method thereof. According to the invention, a melamine-formaldehyde resin is used as a wall material, n-tetradecyl alcohol is used as a core material, and an emulsification method of combined liquid crystalline phase emulsification method of microemulsion and phase inversion temperature method is utilized to prepare n-tetradecyl alcohol emulsion; prepared melamine-formaldehyde performed polymers and n-tetradecyl alcohol emulsion are utilized to prepare the n-tetradecyl alcohol phase-change microcapsule by using in situ polymerization. The n-tetradecyl alcohol phase-change microcapsule has the advantages of no residual formaldehyde, an uniform particle size, great latent heat of phase change, resistance to organic solvents and good water resistance, and is easy to blend with cement concrete and a variety of resins to form composite high-molecular phase-change materials with more excellent performance.

The invention relates to a mining temperature reduction coolant and preparation method thereof. The invention takes macromolecular compound polyvinyl alcohol as basic raw material, cross-linking agent in certain proportion is added, wherein the cross-linking agent is 10% borax solution and the like; then freezing point temperature reduction auxiliary agent is added to prepare gel-like coolant, the prepared coolant is injected into a forming container and is frozen and formed in an icehouse the temperature of which is lower than minus 15 DEG C, and then the formed coolant is unfrozen at room temperature and is filled into a packaging bag. The mining temperature reduction coolant of the invention has the following characteristics: (1) elasticity and flexibility are good, comfortable sensation can be obtained when human body touches the coolant; (2) cold accumulation material has major latent heat of phase change and appropriate phase change temperature; (3) the coolant can be repeatedly used, can not be cataklastic, can not contract and can produce no separated water; (4) the coolant can be in close contact with human body when in use, and refrigeration effect can be fully played; (5) no toxin, odour or pollution is produced; (6) cold insulating plate and cold insulating bag of the outer packing of the coolant has the function of 'environmental protection and high efficiency cold insulation heat preservation'.

The invention discloses a shell-and-tube electrical automobile battery device with an enhanced radiation function, which comprises battery single bodies, a heat exchanger shell and an interceptor plate, wherein the plurality of battery single bodies are arranged in the heat exchanger shell; each battery single body is a battery bundle formed by placing a plurality of single batteries into a heat exchanger tube and connecting the single batteries in series or parallel or both series and parallel; the heat exchanger shell is also provided with a liquid inlet pipe for allowing a phase-change material or liquid to enter the heat exchanger shell, or a foam material is filled in gaps among adjacent battery single bodies and gaps between the battery single bodies and the heat exchanger shell; the interceptor plate for controlling the flow speed of fluid is also arranged in the heat exchanger shell; and the two ends of the heat exchanger shell are provided with cover plates. The device can realize the effective cooling of an entire battery module of a power battery in a severe hot environment, keep the temperature distribution balance among the battery single bodies and the temperature in the battery in a reasonable range for reaching the optimal operation condition of power equipment, prolong the service life of the battery, and improve the power performance of the power equipment.

An efficient heat-accumulated hydrogen accumulator for Mg-base hydrogen-bearing material is a cylindrical body, which is composed of external and internal shells and vacuum layer between them, insulating layer on the inner surface of internal shell, heat accumulating tubes in the insulating layer, heat transfer tube at inside of the most external heat accumulating layer, hydrogen distributing and filtering tube passing through hdyrogen filter layer and installed at central position of internal shell, and hydrogen filter layer installed on supporting plate on the internal shell. It features that the heat generated by absorbing hydrogen is accumulated for supplying it when hydrogen is released.

The invention discloses a cigarette tow with a phase change heat absorption function. The tow is obtained as follows: microcapsules containing a phase change agent are added to a food fiber-grade polylactic acid material in a melt spinning process, and drying, melting, spinning, cooling, oiling, drafting, crimping and drying setting processes are performed. During smoking of a cigarette with a filter tip processed from fiber prepared with the preparation method, polylactic aid hollow fiber has high adsorption/absorption capacity for polar and non-polar smoke component gases; meanwhile, the temperature of smoke passing through the filter tip is increased, the polylactic acid material and the phase change material in the microcapsules absorb heat during phase state conversion, the smoke temperature is decreased, a harm reduction effect is realized, the prepared cigarette with the polylactic acid filter tip has unique smell absorption style, and harmful substances in smoke can be effectively filtered out.

The invention relates to a daily used vacuum cup, in particular to a compound-phase variable-speed cooling constant-temperature cup. The solid-liquid compound-phase variable-speed cooling constant-temperature cup comprises a cup lid and a cup body, wherein the cup lid is in sealed connection with the cup body, the cup body comprises an inner cup wall, a middle cup wall and an outer cup wall, the internal cavity of the inner cup wall forms a beverage containing cavity, the airtight cavity between the inner cup wall and the middle cup wall is filled with inorganic hydrous salt compound phase change liquid, the airtight cavity between the bottom of the inner cup wall and the bottom of the middle cup wall is designed into a phase change alloy rapid-cooling interlayer, and the phase change alloy rapid-cooling interlayer is provided with built-in low-melting-point phase change alloy. In a solid-liquid compound-phase variable-speed cooling microwave heating constant-temperature cup, the airtight cavity between the inner cup wall and the middle cup wall is filled with inorganic hydrous salt compound phase change liquid to form a phase change liquid heating cavity, one or more distributed rod-like microwave antennae are arranged in the phase change liquid heating cavity, and a solid-state microwave power source, a power supply part and a control system are arranged in a cup base.

The invention belongs to the technical field of heat storage materials and particularly discloses a high-temperature phase-changing composite heat storage ceramic matrix material and a preparation method thereof. The material is prepared from raw materials in parts by weight as follows: 10-15 parts of a ceramic matrix, 20-30 parts of lithium carbonate, 20-30 parts of potassium carbonate, 30-40 parts of sodium carbonate, 1-2 parts of high-thermal-conductivity carbon fiber and 1-2 parts of doped graphite. The prepared high-temperature phase-changing composite heat storage ceramic matrix materialhas the advantages of large phase change latent heat, high high-temperature stability, low toxicity, small corrosion and the like and can be used as a phase-changing heat storage material, and the energy conversion efficiency is improved; the thermal conduction performance is higher, and the heat absorption and release speed is higher; the appearance of the material cannot be changed during phasechanging, and leakage can be effectively prevented.

The invention discloses a sodium silicate-molten binary nitrate compounded heat-transfer heat-storage medium and its preparation method and use. The sodium silicate-molten binary nitrate compounded heat-transfer heat-storage medium is prepared by compounding a molten binary nitrate system and sodium silicate. The molten binary nitrate system mainly comprises potassium nitrate and sodium nitrate. The sodium silicate-molten binary nitrate compounded heat-transfer heat-storage medium has heat-transfer performances of the nitric acid molten salt, improves a safe work temperature upper limit of the system to 650 DEG C, and has a wide use temperature range and good thermal conductivity. The sodium silicate-molten binary nitrate compounded heat-transfer heat-storage medium has good heat absorption and heat-storage capability, solves the problem that the molten binary nitrate has poor thermal conductivity and easily produces local overheating, and can be widely used in the technical field of solar photo-thermal power generating.

The invention discloses an LNG cold energy utilization new method, the method mainly comprises the following steps: step 1. Reliquefaction: the reliquefaction of flash LNG steam is carried out by a reliquefaction device; step 2. Energy storage: the heat exchange of LNG and energy storage materials in an LNG liquid storage device is carried out, and the released cold energy is stored in a cold storage device; step 3. Energy release: the energy storage materials are dissolved for releasing the cold energy which is further transferred to a tail-end cold energy utilizing device; step 4. Optimization: a part of the LNG can be directly gasified to produce the cold energy which is supplied to the tail-end cold energy utilizing device. The LNG cold energy utilization new method of the invention has simple structure of the needed system, convenient operation, high utilization ratio to LNG cold energy and high economic benefits.

The invention discloses a method for manufacturing phase-change heat absorption swelling fire-retardant wood and the swelling fire-retardant wood. The manufacturing method includes the following steps that the wood is processed and manufactured according to the dimensions required, so that a solid wood component is obtained; the solid wood component is subjected to degreasing and duct dredging pretreatment, and accordingly the pretreated solid wood component can be obtained; the pretreated solid wood component is put into phase-change heat absorption swelling fire-retardant steeping liquor for conducting vacuum pressure impregnation treatment, and then drying is performed, so that the solid wood component filled with a phase-change heat absorption swelling fire-retardant material is obtained; the solid wood component filled with the phase-change heat absorption swelling fire-retardant material is subjected to sanding shaping and surface closing protective treatment, and accordingly the phase-change heat absorption swelling fire-retardant wood is obtained. The swelling fire-retardant wood obtained through the manufacturing method achieves phase-change heat absorption in the heating process of the wood and forms a swelling foam carbon layer under the fire condition, the change of fires can be lowered and fire losses are reduced.

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 relates to the field of application of electronic functional materials, and particularly discloses a preparation method of a heat-conducting wave-absorbing phase-change composite material, and the composite material. The preparation method of the heat-conducting wave-absorbing phase-change composite material comprises the following steps: S1, premixing: adding thermoplastic resin with a first melting point into a premixing container provided with a heating device, and sequentially adding thermoplastic resin with a second melting point and a phase-change microcapsule after melting; S2, filler mixing: adding a wave-absorbing filler, a heat-conducting filler and an auxiliary agent into a phase-change premixed base material obtained in the step S1, and conducting uniform stirringand dispersing to obtain a semi-finished product; and S3, calendering: calendering the semi-finished product at a calendering temperature to a required thickness, and conducting cooling to obtain theheat-conducting wave-absorbing phase-change composite material. Due to the fact that the calendering temperature corresponds to the first melting point of the thermoplastic resin with the first melting point, and the second melting point of the thermoplastic resin with the second melting point is lower than the first melting point of the thermoplastic resin with the first melting point by 20 DEGC or more and lower than the calendering temperature by 10 DEG C or more, so the effect of avoiding cracking of the shell structure of the phase-change microcapsule during calendering is achieved.

The invention provides a low-temperature phase-change heat storage material and a preparation method thereof. The low-temperature phase-change heat storage material comprises the following components in percentage by weight: 90%-92% of sodium acetate trihydrate, 3%-5% of tetrasodium pyrophosphate decahydrate, 2%-3% of anhydrous sodium carbonate and 1%-2% of polyacrylamide. The preparation method comprises the following steps of: grinding the four components until the granularity is 30-50 meshes respectively, mixing uniformly, and heating the mixture in a water bath at the temperature of 74-79 DEG C, so as to completely melt all the components to form a colloidal liquid; after stirring uniformly, injecting the colloidal liquid into a container, wherein the injected volume is 88%-90% of the volume of the container; and after the colloidal liquid is cooled to room temperature, sealing the container. According to the invention, the adding ratio of an additive is low, the stability of the material is high, the phase-change latent heat is large, the crystallization temperature is moderate, and the supercooling degree is not more than 2 DEG C; and the phase-change heat storage material is the colloidal liquid in melting, so that the phase separation phenomenon is avoided, the preparation process is simple, the packaging is easy and the production is convenient.