473 results about "Composite phase change material" patented technology

The invention discloses a preparation method of a flexible material with double functions of radiation refrigeration and photothermal conversion storage, and relates to the field of composite phase change materials. The preparation method comprises the following steps: 1) preparing the flexible phase change material matrix by utilizing n-octadecane, SEBS and POE through hot pressing; 2) preparing a BaSO4 solution by using absolute ethyl alcohol, deionized water, a water-based defoaming agent, a water-based dispersing agent and an acrylic resin emulsion; (3) preparing an MXene solution; and 4) spraying the BaSO4 solution on the surface of one side of the flexible composite phase change material matrix by using a spray gun, and spraying the MXene solution on the surface of the other side of the flexible composite phase change material matrix to obtain the flexible composite phase change material. The radiation refrigeration layer can strongly reflect visible light and near-infrared light, has high emissivity in an infrared light area, especially in an atmospheric window wave band, reduces absorbed atmospheric heat radiation, reduces urban heat island effect caused by dense building groups in cities, and can effectively solve the problems of large day and night temperature difference and heat supply and demand in summer and winter.

The invention discloses a building composite phase change material intelligent matching and optimizing method based on a large language model, and belongs to the technical field of building energy saving and intelligent material design. Basic thermophysical property data, building environment parameter data and user demand data are collected; a deep reinforcement learning technology is utilized to construct an intelligent model based on a deep Q network strategy, and generated data samples are integrated into a thermophysical property database; outputting a candidate material combination recommendation scheme by adopting a large language model; evaluating the candidate material combination recommendation scheme by using the semantic tag vector and a sorting engine to obtain a performance evaluation result; generating a performance evaluation report according to the simulation model; a multi-agent negotiation algorithm is adopted, cross-regional thermal control performance is optimized, a multi-dimensional performance comparison diagram and tuning suggestions are generated, correction information of designers is recorded, optimization is carried out, and feedback is provided in a self-adaptive mode. According to the method, the building composite phase change material combination is screened, cross-regional thermal control is optimized, adaptive schemes and suggestions are output, and the self-adaptive optimization capability of the system is improved.

The invention relates to the technical field of thermal management material preparation, solves the technical problems of loose heat conduction network structure and non-uniform heat conduction direction of a flexible composite phase change material, and particularly relates to a magnetic polymer-based flexible composite phase change material and a preparation method thereof. Comprising the following steps: preparing a modified polydimethylsiloxane prepolymer from a carbon nanotube dispersion liquid and a polydimethylsiloxane prepolymer; adopting a Pickering emulsion method to mix 42 # paraffin, the modified polydimethylsiloxane prepolymer and nano cellulose to prepare a composite phase change material emulsion; silver mirror reaction is adopted to carry out surface silver plating on the magnetic neodymium iron boron particles; the magnetic polymer-based flexible composite phase change material is prepared from the composite phase change material emulsion and the surface-silvered magnetic neodymium iron boron particles. The high flexibility and magnetism of the prepared material in a normal temperature state endow the material with a more convenient installation mode and lower contact thermal resistance, the heat conduction network structure and component compatibility of the material are improved, and the application requirements of a phase change thermal management technology can be met.

The invention discloses a UPS battery temperature control structure and a temperature control method thereof, and the structure comprises a battery module, a thermoelectric coupling layer, and a heat insulation housing. The battery module consists of a plurality of battery units, and unit gaps are filled with a composite phase change material; the thermoelectric coupling layer comprises a semiconductor thermoelectric module array and a heat conduction assembly, and precise heat conduction is achieved through bidirectional temperature control of semiconductor thermoelectric modules and directional heat conduction of heat pipes. The heat insulation shell comprises an inner aerogel heat insulation layer and a radiation coating and isolates external extreme temperature interference. The temperature control method comprises the steps of monitoring the battery temperature, the environment temperature and the phase change state of the composite phase change material in real time, dynamically selecting a pure composite phase change material buffer mode and a semiconductor thermoelectric module active or mixed mode, and generating power and recharging energy by using the temperature difference of the cold end and the hot end of the semiconductor thermoelectric module. Through the synergistic effect of the composite phase change material, the semiconductor thermoelectric module and the shell, the temperature of the battery can be stabilized without external constant temperature equipment, and the temperature control energy consumption is low.

The invention relates to the technical field of power system optimization scheduling, and provides a multi-time-scale new energy-stored energy joint output optimization method and system based on spot price, so as to solve the problems of poor system operation stability and low new energy regulation and control precision in the prior art. The method comprises the following steps: detecting a temperature change rate of a composite phase change material in an energy charging and discharging process to determine a heat storage capability state of an energy storage unit, and generating a day-ahead joint scheduling plan considering operation cost and a new energy consumption rate in a coordinated optimization framework by combining day-ahead electricity price data; constructing an elastic matrix based on historical electricity consumption data, correcting the elastic matrix by using latest market information and a system state, and determining a load adjustment amount in combination with an intraday electricity price; and based on the real-time electricity price and the load adjustment amount, a model prediction control algorithm is adopted to calculate real-time output adjustment instructions of the new energy unit and the energy storage unit in a rolling manner, and the operation states of the two units are synchronously adjusted to realize collaborative optimization. The system operation stability and the new energy regulation and control precision are improved.

The present invention belongs to the technical field of material dehydration, and particularly relates to a dehydration device for an urban waste biomass-based composite phase change material, which comprises a bracket. A roll press filter is installed on the bracket. The roll press filter includes two side plates, two pairs of driving rollers, two guide rollers, two filter belts with mesh holes, and a connecting frame. Two hollow brush barrels driven by a gear set are rotatably connected between the two side plates. The hollow brush barrels have bristles that contact the filter belts. A drying box is installed on the bracket, and a rotating spiral frame is arranged in the drying box. The material after being filter-pressed by the roll press filter enters the drying box for drying. The rotating spiral frame and the stirring rods make the material turn over. Under the action of the gear set, the rotating hollow brush barrels brush off the material on the filter belts through the bristles, reducing the adhesion of the material and ensuring the effect of subsequent filter-pressing of the filter belts on the material. The moving inclined plate reciprocates through a moving mechanism to break the material, reducing the stacking of the material and improving the drying effect.

The invention discloses a diaphragm and an electrochemical device, and belongs to the field of electrochemical energy storage. The diaphragm is used for the electrochemical device and comprises a base membrane and a coating arranged on one side or two sides of the base membrane in the thickness direction, the coating comprises a composite phase-change material, the composite phase-change material comprises a conductive polymer layer and a tubular material, the conductive polymer layer partially or completely coats the surface of the tubular material, and the tubular material is coated with the conductive polymer layer. A phase change material is contained in the tube of the tubular material. According to the diaphragm, the high-temperature thermal safety performance of the diaphragm can be improved under the condition that the high-temperature mechanical performance of the diaphragm is not damaged.

The invention discloses a carbon aerogel / reduced graphene oxide double-framework composite phase change material based on shaddock peel as well as a preparation method and application of the carbon aerogel / reduced graphene oxide double-framework composite phase change material. According to the method, the carbon aerogel / reduced graphene oxide double-framework material (CPA-rGO) with a hierarchical pore structure is constructed by taking waste shaddock peel as a raw material through freeze drying, a layer-by-layer self-assembly (LbL) technology and a gas-phase reduction and high-temperature carbonization process. And then, loading n-octacosane in the porous skeleton by a vacuum-assisted impregnation method to form the composite phase change material (OCPA-rGO) with a stable shape. The material has excellent leakproof performance (the leakage rate at 70 DEG C is only 4%), high thermal conductivity (0.366 W / (m.K)), remarkable photothermal conversion efficiency (91.6%) and electrothermal response characteristic, has a temperature sensitive resistance function, and can be applied to building energy-saving temperature control and intelligent household high-temperature early warning systems. According to the invention, high-value utilization of agricultural wastes is realized, and a new thought is provided for design of efficient and multifunctional phase change energy storage materials.

The invention discloses an energy-saving driving device based on automatic control, which comprises a support frame, a conveying mechanism is mounted at the upper end of the support frame, a transmission belt is mounted on the conveying mechanism, a plurality of photonic crystal pressure sensors are arranged on the transmission belt at equal intervals, and a driving motor body is mounted at one end of the conveying mechanism. A protective shell is installed on the outer side of the driving motor body, a stator shell is installed in the protective shell, a plurality of stator grooves are formed in the circumferential side wall in the stator shell at equal intervals, and heat storage layers are installed in the stator grooves. The static heat insulation limitation of a traditional vacuum heat insulation plate is broken through, the shell of the driving device has the efficient heat insulation and active heat dissipation capacity, in addition, the maintainability is greatly reduced through the self-repairing design, the use convenience is improved, light intensity change is used for detecting goods distribution, linkage adjustment of the rotating speed of the transmission roller is achieved, and idling energy consumption is reduced; the paraffin and graphene composite phase change material can fully meet the low-temperature conveying requirement, and the service life is prolonged.

The invention provides a battery thermal management method and device combining a composite phase change material and an adsorption heat pump, and relates to the technical field of battery thermal management, the method is applied to the battery thermal management device, and the battery thermal management device absorbs heat generated by a battery pack of an energy storage battery through the composite phase change material, and stores the heat generated by the battery pack through the adsorption heat pump. The battery heat management device is used for cooling and heating the battery pack through an adsorption type heat pump; the method comprises the following steps: acquiring the temperature of the battery pack; controlling the composite phase change material to absorb heat generated by the battery pack based on the temperature of the battery pack; obtaining the temperature of the composite phase change material; and controlling the adsorption heat pump to cool the battery pack based on the temperature of the composite phase change material. According to the invention, a composite phase change material and an adsorption type heat pump adsorption and desorption technology can be combined, so that the control on the temperature of the energy storage battery cell and the efficient energy-saving operation of the energy storage battery cell are realized.

The invention discloses a eutectic composite phase change material and a preparation method thereof, the composite phase change material takes long-chain fatty acid, long-chain alcohol and saturated fatty acid as raw materials, and the obtained composite phase change material shows excellent heat storage and release capability and temperature regulation capability.

The invention discloses a wood-based composite phase-change material and a preparation method thereof, and belongs to the technical field of phase-change materials.The preparation method of the wood-based composite phase-change material comprises the following steps that wood is cut and then added into delignification liquid to be heated, the wood is taken out and washed with water, and delignified wood is obtained; the delignification wood is added into the modification liquid to be heated, and after being taken out, the delignification wood is washed and dried to obtain pretreated wood; mixing polyethylene glycol, citric acid and boric acid, heating and stirring to obtain a phase change material; dipping the pretreated wood into the phase change material for vacuum dipping, taking out and drying to obtain the phase change material. The modified liquid is prepared from an ethanol water solution, a modified filler, 2-(3, 4-cyclohexene oxide) ethyltrimethoxysilane and triethylamine. The delignification liquid and the modification liquid are adopted for pretreating the wood, so that the wood can be better firmly combined with the phase change material, leakage is prevented, and the finally prepared wood-based composite phase change material has excellent heat management capacity and stability.

The invention discloses a photovoltaic energy storage and cooling coupled system and method based on a copper-based composite phase change material. A power generation module, a cooling energy storage module, an energy conversion module and the like are included. In the daytime, the solar photovoltaic panel emits heat, and the copper-based composite phase change material absorbs heat, stores energy and cools the photovoltaic panel; at night, the phase change material releases heat, and the thermoelectric material converts heat energy into electric energy. The system uses a DDPG algorithm of deep reinforcement learning to optimize operation. The state space comprises parameters such as the temperature of the solar photovoltaic panel and the temperature of the phase-change material, and the action space relates to operations such as control of cooling energy storage and energy conversion. The reward function is designed in multiple aspects of comprehensive efficiency, energy storage, electric energy output and stability. By constructing a strategy network and a value network, the system can make decisions according to environmental changes. And extracting data from the experience playback buffer area to update network parameters so as to enable the system to perform self-adaptive adjustment. The system not only solves the problems of high temperature of the photovoltaic panel and power generation at night, but also improves the energy utilization efficiency by using an algorithm, and the performance is far better than that of a traditional photovoltaic system.

The present disclosure provides a phase change energy storage concrete aggregate, a preparation method thereof and an application thereof, belonging to the technical field of building materials. The phase change energy storage concrete aggregate includes: a first inner core, the first inner core including composite phase change material particles and a porous cement-based material; and a first shell layer formed on the outer surface of the first inner core, the first shell layer including a cement-based encapsulating material; wherein, the composite phase change material particles include: a second inner core, the second inner core including an inorganic hydrated salt phase change material and a porous medium material, the inorganic hydrated salt phase change material being loaded in the pores of the porous medium material; and a second shell layer formed on the outer surface of the second inner core, the second shell layer sequentially including a hydrophobic layer, a polymer layer and a hydrophilic layer from inside to outside. The present disclosure effectively blocks the dehydration channels of the inorganic hydrated salt phase change material by using a double-shell layer structure, and improves the thermal performance of the phase change energy storage concrete aggregate.

The invention belongs to the technical field of phase change materials, and particularly relates to an erythritol and fumed silica composite phase change material and a preparation method thereof.The preparation method comprises the following process steps that fumed silica and erythritol are mixed according to the mass ratio of 10: 90-30: 70, and a mixture is obtained; heating the mixture at 130-160 DEG C for 2-4 hours, and stirring for 5 minutes every 30 minutes in the heating process; the heated mixture is subjected to dipping treatment under the vacuum condition, and composite phase change material powder is obtained; the composite phase-change material powder is subjected to compression molding under the pressure of 3-5 MPa, the pressure is maintained for 3-7 minutes, and the erythritol fumed silica low-heat-conductivity shaped composite phase-change material is obtained, the problem of phase-change material leakage is solved, the packaging cost is reduced, meanwhile, the heat conductivity of the phase-change material can be reduced, the phase-change material has the heat insulation and heat storage capacity, and the thermal conductivity of the phase-change material is improved. The application in the field of thermal protection is facilitated.

The invention discloses a thermal management system based on double-layer phase change and air cooling cooperative heat dissipation. The system comprises a battery module, a first-stage phase change layer, a second-stage phase change layer, a binding post, a supporting plate, a sleeve and an air cooling channel. The double-layer phase-change cooling device is filled with two composite phase-change materials with high heat conductivity coefficients, and the composite phase-change materials are distributed in the radial direction, so that heat generated by the battery can be quickly absorbed, and the temperature in the battery module is kept uniform. And when the power battery module operates for a preset time length, the air cooling device is automatically started, and part of heat absorbed by the phase change device is dissipated to the environment. The air cooling system adopts a square wave type air supply strategy, that is, intermittent cooling airflow is provided by periodically starting and stopping a fan. By combining the double-layer phase change cooling and air cooling technology, the problems of non-uniform internal temperature distribution and local overheating of the battery module are effectively improved, the applicable working condition range of the battery module is expanded, and the stability and reliability of the system are improved.

The invention discloses a self-repairing type phase change microcapsule and application thereof in a wood-based energy storage wall, the self-repairing type phase change microcapsule is characterized in that an inner core layer is composed of composite paraffin and butyl stearate composite phase change materials, gradient refractive index silicon dioxide microspheres are arranged on the surface of the inner core layer, and a middle shell layer is a composite film formed by polyurea and furan-epoxy monomer copolymer; the reinforced shell layer is of a three-dimensional network structure which is formed by nano SiO2 through a sol-gel method, has the porosity of 20-25% and is in gradient distribution; according to the invention, a three-dimensional network structure formed by a Diels-Alder dynamic bonding network of a middle shell layer and nano SiO2 of an enhanced shell layer is used for synergistically constructing a self-repairing system of the microcapsule, so that the self-repairing function of the phase change microcapsule material is realized, the defect of failure caused by physical damage of the microcapsule is avoided, and the service life of the phase change microcapsule material is prolonged. And meanwhile, through gradient packaging preparation of the inner core layer and the enhanced shell layer, the problem of thermal stress concentration is effectively solved.

The invention provides a high-thermal-conductivity glass fiber reinforced phase change laminated plate and a preparation method thereof.The preparation method comprises the steps that S1, expanded graphite and molten n-octadecane are mixed and then subjected to vacuum impregnation treatment, then molten n-alkane is added, and a second composite phase change material is obtained; s2, carrying out single-side modification on the glass fiber cloth by using a silane coupling agent, and coating the modified surface of the single-side modified glass fiber cloth with a second composite phase change material to form a temperature control coating; s3, mixing modified nano silicon dioxide, polyurethane acrylic resin and a silane coupling agent, and then coating the unmodified surface of the single-surface modified glass fiber cloth with the mixture to obtain double-surface modified glass fiber cloth; and S4, symmetrically overlapping the two layers of double-sided modified glass fiber cloth, and performing hot-pressing compounding to obtain the high-thermal-conductivity glass fiber reinforced phase change laminated plate. The problems of liquid phase leakage and low thermal conductivity of the phase change material are effectively solved through the synergistic enhancement effect of the expanded graphite and the glass fibers and the design of the barrier coating.

The copper-based composite phase change material photovoltaic energy storage and cooling coupled system and method covers power generation, cooling energy storage, energy conversion and other modules. During the day, the solar photovoltaic panel generates heat, the copper-based composite phase change material absorbs heat and stores energy and cools the photovoltaic panel; at night, the phase change material releases heat, and the thermoelectric material converts thermal energy into electrical energy. The system uses the DDPG algorithm of deep reinforcement learning to optimize operation. The state space includes solar photovoltaic panel temperature, phase change material temperature and other parameters, and the action space involves controlling cooling energy storage, energy conversion and other operations. The reward function is designed from multiple aspects such as efficiency, energy storage, power output and stability. By constructing a policy network and a value network, the system can make decisions according to environmental changes. Data is extracted from the experience replay buffer to update network parameters, allowing the system to adaptively adjust. The system not only solves the problem of high temperature of photovoltaic panels and night power generation, but also uses algorithms to improve energy utilization efficiency, which is far superior to traditional photovoltaic systems in performance.

The invention discloses an anti-leakage high-thermal-conductivity composite phase change material which comprises the following raw materials in parts by mass: 100 parts of a carbon precursor solution, 10-40 parts of a two-dimensional nanofiller, 6-24 parts of surface modified carbon nanofibers and 900-1000 parts of a phase change material. The invention further discloses a preparation method of the leakproof high-thermal-conductivity composite phase change material. The integrated amphiphilic phase change material packaging structure which is formed by the one-dimensional / two-dimensional heterogeneous hybrid filler and the continuous phase carbon source and is subjected to surface treatment can provide an efficient heat transfer path for heat conduction; and good liquid phase change material packaging is formed through the hydrogen-bond interaction of the phase change material and the surface modification coating layer, so that the leakproof performance of the structure is improved.

The invention provides an infrared shielding flexible composite phase change film and a preparation method thereof. The composite phase change film is a flexible composite film material synthesized by taking a cellulose acetate porous film as a framework and a phase change material as a core material and doping a high-reflectivity nanoparticle material. The preparation method of the composite phase change membrane comprises the following steps: forming pores by a phase inversion method, carrying out gravity settling to obtain a cellulose acetate porous membrane with low emissivity, and dipping to obtain the flexible composite phase change membrane. The prepared flexible composite phase change film is a bendable film with certain mechanical strength, the system has the infrared emissivity reducing performance and the temperature control performance, and the composite phase change material under the dual-mode function can efficiently achieve the infrared shielding effect.

The invention discloses an intelligent gradient physical cooling system which comprises an intelligent temperature control module, an ergonomic fitting structure and a multi-parameter early warning module. The intelligent temperature control module comprises a phase change material array, a dual-channel temperature feedback and PID closed-loop control; the ergonomic fitting structure comprises a topological optimization cooling patch and a pressure-temperature coupling protector; the multi-parameter early-warning module comprises a high-heat risk index and AR nursing assistance, the lauric acid / lauric acid composite phase-change material PCM is adopted, the long-acting cooling performance is achieved, heat can be absorbed and released, the proper phase-change temperature can effectively adjust the temperature of the human body, the natural body temperature adjusting process is simulated, the phase-change material PCM forms a replaceable cold source, and the temperature of the human body can be effectively adjusted. A gradient temperature difference is formed between the PCM array and the human body core temperature, body surface heat is efficiently absorbed through solid-liquid phase change, cooling liquid is driven to flow through the PCM array by means of a micro hydraulic pump, the cooling liquid returns to the heat dissipation module after absorbing the heat, and circulating cooling is achieved.

The invention relates to the technical field of comprehensive utilization of solar energy, in particular to a photovoltaic heat combined supply self-adaptive heat flow control system and a control method thereof, a photovoltaic-heat-storage-diagnosis integrated module is composed of a photovoltaic layer, a micro-channel heat exchange layer, a heat storage unit, a self-diagnosis unit and an intelligent control unit, based on illumination intensity, assembly temperature, fluid flow, environment humidity and wind speed data, the flow velocity of a cooling medium is dynamically adjusted through an algorithm fusing model predictive control and deep reinforcement learning, and the controller adopts a multi-core heterogeneous processor and supports OTA remote upgrade and standardization module interfaces. Through the collaborative design of the double-sided power generation assembly and the composite nanofluid and in combination with an intelligent heat flow control strategy, the temperature of the photovoltaic assembly is stabilized within the optimal interval of 25-40 DEG C, and the power generation efficiency is improved by 15-30% compared with that of a traditional system; and the heat storage unit adopts a paraffin-based / carbon nanotube composite phase change material, and is matched with a three-stage waste heat recovery system, so that the breakthrough improvement of the comprehensive utilization rate of solar energy is realized.

The invention discloses a high-temperature composite phase change heat storage material and a preparation method thereof, and belongs to the technical field of composite phase change heat storage materials. The composite phase change material comprises a matrix and a phase change material, the base body is porous ceramic, and the porous ceramic comprises a lining with a porous structure and a surface layer with a porous structure; compared with the pore diameter of the lining, the pore diameter of the surface layer is smaller; the high-temperature salt in a molten state can enter the inside through small holes in the surface layer; the surface layer can avoid leakage of high-temperature salt in a molten state, and the lining provides a storage and phase change space for the high-temperature salt; the porosity of the lining is larger than that of the surface layer, and the phase change material comprises high-temperature salt.

The invention discloses a latent heat integrated solar driven fluidized bed self-adaptive heat management gasification reactor which comprises a fluidized bed gasification reaction cavity, an absorption and storage integrated latent heat integration module and a supporting component. The supporting component comprises a heat insulation top cover, a heat insulation side wall, a supporting floor, a SiC packaging shell and a heat preservation material. The absorption and storage integrated latent heat integration module comprises a composite phase change material, a porous absorber and a condensation radiation absorption surface. The high-thermal-conductivity composite phase-change material is used for storing heat under continuous irradiation of solar radiation, the gasification reaction temperature is maintained in the solar intermittent period, it is guaranteed that the thermal chemical reaction is relatively stable, side reactions are reduced, and therefore the quality of synthesis gas is improved. The non-uniform design of the absorption and storage integrated latent heat integration module can effectively improve the internal temperature uniformity of the latent heat integrated solar-driven fluidized bed self-adaptive thermal management gasification reactor, and avoids the influence on the cycle life of an internal assembly due to thermal stress generated by too high temperature difference.

The application provides an octadecane-loaded cellulose-based composite phase change material evaporator and a preparation method and application thereof in seawater desalination, and belongs to the fields of photo-thermal conversion materials and separation technologies. Nanocellulose and polyvinyl alcohol are mixed to prepare an aerogel, octadecane is encapsulated in the pores of the aerogel by a vacuum impregnation method to obtain a composite phase change material aerogel, and the composite phase change material aerogel is coated with a non-woven fabric loaded with polypyrrole to obtain the octadecane-loaded cellulose-based composite phase change material evaporator. The evaporator is a composite phase change material evaporator based on the coupling of interfacial evaporation and phase change energy storage, solves the problems of discontinuous evaporation and low solar energy utilization rate caused by day and night alternation, has excellent light absorption performance, good heat insulation performance and sufficient water supply and the like, can be used for seawater desalination, and has the advantages of high evaporation rate, high energy conversion efficiency, salt precipitation prevention and the like.

The invention discloses a controllable low-temperature composite phase change material of binary inorganic hydrated salt based on sodium sulfate decahydrate and a preparation method of the controllable low-temperature composite phase change material, and relates to the technical field of cold storage. According to the material, sodium sulfate decahydrate is used as a main phase change material, magnesium chloride hexahydrate, zinc nitrate hexahydrate and the like are combined as binary inorganic hydrated salt phase change materials, and a nucleating agent, a thickening agent, a cooling agent and a supporting material are added. The invention has obvious innovation. In a material system, sodium sulfate decahydrate is used as a main body and matched with binary inorganic hydrated salt, the phase change temperature is regulated and controlled in an accurate proportion, and the problems of phase separation and supercooling are solved. The preparation method comprises the following steps: mixing the inorganic hydrated salt with the additive, grinding, magnetically stirring, heating and carrying out vacuum adsorption to prepare the composite phase change material, and blending to obtain the composite material with the required temperature, the composite material is safe and stable, has good thermal conductivity and high phase change latent heat, can accurately control the temperature, meets the requirements of the fields of food, fresh food, medicine, chemical industry and the like in cold-chain transportation, and has wide application prospects. And the transportation efficiency and the product quality are obviously improved.

The invention discloses a heavy-load hydrogen-electricity hybrid power system of an industrial unmanned aerial vehicle, and relates to the technical field of unmanned aerial vehicles, the core comprises a fuel cell, a lithium battery pack, a driving motor and three modules, the fuel cell and the lithium battery pack are connected in parallel with the driving motor, and a dynamic variable liquid cooling system is thermally connected with the fuel cell. The intelligent mission profile prediction module and the liquid cooling system are both in signal connection with the thermal-electric collaborative optimization controller, the prediction module receives data such as an air route and weather, simulates a flight state in a future time period through a model, and outputs predicted power and a temperature curve; the liquid cooling system comprises at least two independent heat dissipation partitions and is integrated with a paraffin-based composite phase change material, the optimization controller outputs optimal parameters through a task-adaptive multi-objective optimization function based on a prediction curve and real-time data, and the system is provided with a data acquisition module, a hydrogen supply control module and a fault early warning module to realize data monitoring, hydrogen supply stability and safety early warning. And the load, endurance and reliability are improved.

A device having: a multilayer composite phase change material structure with: a bottom PCM layer of a first SbTe PCM material having a first metallic doping; a first composite PCM layer on the bottom PCM layer, wherein the first composite PCM layer comprises at least: a first composite layer, comprising said first PCM material having a second metallic doping; and a second composite layer, comprising said first SbTe PCM material undoped, on the first composite layer; and a top PCM layer, comprising first SbTe PCM material having said first metallic doping, on the composite PCM layer. The first metallic doping can be identical to the second metallic doping. The first PCM material can comprise SbTe and the first and second metallic dopings can comprise one of Ge, In and GeIn.

The invention belongs to the technical field of phase change concrete, and particularly relates to a preparation method of composite phase change concrete. The invention provides a composite phase change aggregate. The composite phase change aggregate comprises a porous adsorption material, a composite phase change material and a packaging material, the porous adsorption material comprises expanded vermiculite; the composite phase change material comprises methyl palmitate (MP) and methyl stearate (MS); the packaging material comprises epoxy resin or styrene-acrylic emulsion. The composite phase change aggregate has excellent phase change temperature and latent heat of phase change, still has good thermal stability after multiple cycles, and meanwhile, the composite phase change aggregate replaces fine aggregate to be used for preparing concrete, and the prepared concrete shows good phase change cycle strength stability and heat conduction stability.