786 results about "Heat storage material" patented technology

The invention relates to a power plant waste heat recovery and heat storage type heating composite optimization method and system. A heat exchanger in the waste heat recovery system is accurately selected according to waste heat characteristics, a pipeline is insulated, and a sensor is arranged to be connected with a control system. The heat storage device is made of a composite heat storage material, is modularly designed and has intelligent heat charging and discharging control. The heating network comprises a water supply and return pipe network, a key node is provided with a sensor and a regulating valve, and a user side is provided with an intelligent heat meter. And establishing a collaborative optimization model, solving by adopting an intelligent algorithm, and developing an intelligent predictive control system. The energy utilization efficiency is improved by 20%, the heating quality is optimized, the room temperature uniformity is improved by 15%, the indoor temperature fluctuation is within + / -2 DEG C, meanwhile, the operation cost is reduced by 15%, environmental pollution is reduced, good economic and social benefits are achieved, and the method is suitable for the field of power plant waste heat utilization and heating.

The invention relates to the field of new-generation information technology and civil engineering, in particular to a frost heaving prevention technology of a roadbed in a seasonal frozen area, and particularly relates to a solar heating frost heaving prevention drainage roadbed in the seasonal frozen area and a construction method of the solar heating frost heaving prevention drainage roadbed. The method comprises the steps that environment sunlight data are obtained based on a solar heat collection device, heat energy is stored through an efficient heat storage material, and a heat energy output sequence is generated; acquiring soil temperature, humidity and frost heaving stress data from an environment sensor, predicting a frost heaving trend in combination with historical frost heaving characteristics, and generating regulation and control parameters; the heat energy output sequence and the frost heaving regulation and control parameters are input into a dynamic temperature control and drainage linkage module, heat distribution and optimization adjustment of a drainage path are carried out, and a linkage control strategy is generated; and performing feedback analysis on the operation condition of each module based on the data, and optimizing the control parameters of the dynamic temperature control and drainage linkage module. The temperature and humidity of the roadbed can be accurately adjusted, the frost heaving phenomenon is prevented, and roadbed drainage is optimized.

The invention discloses a high heat storage density stable thermochemical adsorption composite heat storage material and a preparation method thereof, the high heat storage density stable thermochemical adsorption composite heat storage material comprises 54%-57% by mass of mixed salt and 43%-46% by mass of a porous material, the mixed salt comprises MgSO4 and MgCl2, the mass ratio of MgSO4 to MgCl2 is 9: 1-6: 4, and the porous material is expanded perlite modified by nano alumina or a silane coupling agent. The high-heat-storage-density stable thermochemical-adsorption composite heat storage material provided by the invention is simple in preparation method, and the modified expanded perlite is used as a carrier of the mixed hydrated salt; the obtained composite heat storage material has excellent performance: the salt-containing load rate is 114-121%, the water absorption rate is 1.2-1.28 g / g, the heat storage density is 1123.5-1208.6 kJ / kg, the heat storage temperature is 133.4-141.3 DEG C, the structural strength is 10.346-12.631 kPa, the structural stability is 99.27-99.53%, and the stability is 79.7-83.3% after circulation for 30 times, that is, the composite heat storage material is high in heat storage density, high in water absorption rate, low in heat storage temperature, high in strength and not easy to scatter and fall off, and the composite heat storage material is suitable for large-scale production. And the material also has relatively good cycling stability.

The invention provides a waste heat recovery method and system for a phase change heat storage data center, and the method comprises the steps: dynamically adjusting the heat storage capability of a heat storage system of the phase change heat storage data center according to a correlation mapping relation between load fluctuation and heat generation, and analyzing the phase change temperature and latent heat value of a material; determining the heat absorption rate range of the material under different loading conditions; aiming at a heat absorption rate range, combining a nonlinear change rule of a heat storage material to construct a prediction model of a heat release rate, acquiring a dynamic adjustment parameter of heat release from the prediction model as model output, and judging whether the heat release rate meets a heat demand of a user side or not; and according to the optimized heat release rate data, the constant temperature maintaining time of the heat storage material in the solid-liquid conversion process is monitored in real time, and the stability index of the temperature platform is determined.

The invention discloses a multi-energy cooperative control method and system with a self-adaptive disturbance discrimination function, and relates to the technical field of energy cooperative control, and the method comprises the following steps: constructing a multi-band phase fingerprint sequence based on the instantaneous voltage response of a photovoltaic array, and forming an initial energy transition baseline through extracting microsecond phase deviation tracks in different bands; and based on the initial energy transition baseline, constructing time series dynamic gradient mapping, converting the phase deviation trajectory into continuous power gradient distribution, and identifying a potential acceleration fragment in the power gradient distribution. According to the method, a high-sensitivity energy identification mechanism is constructed, pre-judgment is carried out in advance before photovoltaic output sharply rises, and power of different frequency bands is guided to enter a layered energy storage path based on a high-risk window, so that energy deposition according to needs is realized, local thermal stress concentration is avoided, and structural damage and energy storage attenuation of a heat storage body are effectively prevented; the stability and safety of electric heating are improved, and the service life of heat storage materials is prolonged.

The invention relates to the technical field of traditional Chinese medicine physical therapy instruments, in particular to a traditional Chinese medicine physical therapy hot compress device which comprises a waistband body, a temperature uniformizing layer, a physical therapy assembly and a control module. A control module is arranged in the middle of the waistband main body, flexible heating belts are symmetrically arranged on two sides, and adjustable connecting pieces (clamping seats and buckling pieces) are arranged at two ends of the waistband main body, so that the waistline is convenient to adjust; a temperature uniformizing layer and a physiotherapy assembly are sequentially arranged on the inner side of the flexible heating belt, the temperature uniformizing layer is provided with a flexible bag, and the flexible bag is filled with a phase change heat storage material; the physiotherapy assembly comprises a physiotherapy bag and a detachable medicine bag; the control module is provided with a display screen, an adjusting button, an external charging port, a storage battery pack, a temperature sensor and a microprocessor; according to the device, the temperature is accurately controlled through the temperature sensor and the microprocessor, the heat is uniformly distributed through the temperature uniform layer and the phase change material, a user can change a medicine bag according to needs to achieve personalized physiotherapy, and the device has the advantages of being accurate and controllable in temperature, uniform in heat distribution, high in physiotherapy pertinence, convenient and flexible to use and stable and reliable in endurance.

The invention relates to the technical field of waste heat recovery, and particularly discloses an efficient waste heat recovery system based on secondary lead smelting and a cascade using method thereof.The efficient waste heat recovery system comprises a smelting furnace, an air preheater, a cyclone dust collector, a box type dust collector, a waste heat boiler and a raw material drying machine which are sequentially connected; a vertical cylinder with the lower end extending out is concentrically fixed to the top of the heat preservation outer shell, a heat exchange rotor is rotationally arranged at the upper end of the vertical cylinder, the interior of the heat exchange rotor is evenly divided into a plurality of sealed fan-shaped spaces, the fan-shaped spaces are filled with phase change heat storage materials, and a plurality of sets of vertical tubes are arranged in each fan-shaped space. A plurality of groups of radial through heat exchange tubes are arranged in each fan-shaped space; according to the waste heat efficient recovery system and the waste heat cascade using method, on the premise that high-temperature flue gas waste heat is efficiently utilized, corrosion of high-temperature strong acid gas to the heat exchange pipes and the heat exchange media can be avoided, and the service life of the air preheater is guaranteed.

The magnesium-based metal hydride hydrogen storage system with the energy recovery function comprises an energy recovery device and a hydrogen storage tank, a first heat exchange pipe is installed in the energy recovery device, and the energy recovery device is filled with phase change heat storage materials; the hydrogen storage tank is filled with a magnesium-based hydrogen storage material, a second heat exchange pipe is arranged in the hydrogen storage tank, and heat conduction oil is filled in the second heat exchange pipe; an oil outlet of the second heat exchange pipe is connected with an oil inlet of the heating module through a first pipe set, an oil outlet of the heating module is connected with an oil inlet of the second heat exchange pipe through a second pipe set, and a circulating pump is installed on the second pipe set. The first pipe group is connected with an oil inlet of the first heat exchange pipe through a first branch pipe; the second pipe set is connected with an oil outlet of the first heat exchange pipe through a second branch pipe. By arranging the energy recovery device, energy released in the hydrogen absorption process can be recovered, energy is provided in the hydrogen desorption process, energy-saving and efficient hydrogen storage are achieved, and the operation stability of the hydrogen storage system is guaranteed.

The present invention discloses a preparation method and use of an Al2O3-Al composite packaging material, and the preparation method comprises the following steps: step A: uniformly mixing aluminum powder, aluminum oxide powder, CuO-TiO2 powder and ceramic particle additive powder to obtain a mixed raw material A; step B: adding a polyvinyl alcohol aqueous solution to the mixed raw material A and grinding it fully to obtain a mixed raw material B; step C: placing the mixed raw material B in a ball mill for ball milling, and obtaining a mixed raw material C after the ball milling is completed; step D: cold-pressing the mixed raw material C to obtain a prefabricated block; step E: placing the prefabricated block in a resistance furnace for sintering, and cooling it to room temperature with the furnace after the sintering is completed, to obtain an Al2O3-Al composite packaging material. The composite packaging material is used to encapsulate an aluminum-silicon alloy phase change heat storage material. The composite packaging material prepared by the present invention can be used to encapsulate an aluminum-silicon alloy phase change heat storage material, and has the advantages of good corrosion resistance and not easy to leak.

The application discloses finned tube type phase change heat storage equipment, including heat storage shell, both ends of heat storage shell are provided with sealing end plate, two sealing end plates are arranged, the inside of heat storage shell between two sealing end plates is provided with partition layer, the middle of heat storage shell is provided with coaxial center flow pipe, the opposite ends of center flow pipe are sealed and penetrated through sealing end plate through sealing sleeve, the space between partition layer and center flow pipe is set as phase change heat storage cavity, the inside of partition layer and the outside of center flow pipe are provided with heat transfer fin, the application belongs to phase change heat storage technical field, the purpose of the application is to solve the problems of low heat storage efficiency and poor equipment stability in prior art, the technical effects are as follows: double flow makes phase change heat storage efficiency improved, double cavity phase change heat storage material is arranged in heat storage equipment, heat storage energy efficiency is high, fin strengthens phase change heat storage and structural support, equipment is stable, and has good sealing and plugging performance.

The invention discloses a hydrotalcite precursor calcium-based material as well as a preparation method and application thereof. The method comprises the following steps: taking calcium hydroxide and aluminum hydroxide as a calcium source and an aluminum source, and performing constant-temperature water bath and phase transformation in an alkaline environment created by sodium carbonate to obtain a hydrotalcite precursor material with a layered double hydroxide structure; the preparation method comprises the following steps: performing high-temperature calcination on a hydrotalcite precursor, performing phase transformation on the hydrotalcite precursor to form a composite structure containing active CaO and a mayenite skeleton phase, and introducing oxygen vacancies into the material to improve the COadsorption capacity and cycling stability to obtain the calcium-based material based on hydrotalcite phase transformation modification. The problems of high-temperature sintering and agglomeration of the calcium carbonate calcium-based heat storage material in multiple heat charging and discharging processes can be solved, and the service life of the material is prolonged. Meanwhile, oxygen deficiency is introduced into the material in the phase transformation process, the reaction cycle stability and the thermochemical heat storage efficiency are improved, and the material is suitable for the field of medium-high temperature thermochemical industrial energy storage.

The invention discloses a three-dimensional incongruous fractal fin latent heat storage device which comprises an outer pipe shell and a fluid inner pipe, the fluid inner pipe is arranged in the outer pipe shell in a penetrating mode, the space between the outer pipe shell and the fluid inner pipe is filled with phase change heat storage materials, and a plurality of three-dimensional incongruous fractal fins are arranged on the outer side wall of the fluid inner pipe. Each three-dimensional incongruous fractal fin comprises a linear first-stage main fin, two second-stage fractal fins and four third-stage fractal fins, the first end of each first-stage main fin is connected to the outer side wall of the fluid inner pipe, and the second-stage fractal fins are distributed in a V shape on the radial section of the fluid inner pipe and jointly connected to the second end of the first-stage main fin; every two third-stage fractal fins are distributed in a V shape on the axial section of the fluid inner pipe and jointly connected to the ends, away from the first-stage main fins, of the second-stage fractal fins. The invention further discloses a fin optimization method of the heat exchanger. The melting time can be shortened while the heat storage amount can be guaranteed, and efficient heat exchange of the phase change latent heat storage device is achieved.

The invention discloses a phase-change heat-storage fluffy fiber and a preparation method thereof. According to the method, polyethylene glycol, microcapsules, fatty acid, paraffin or alkane and the like are used as phase change heat storage materials, elastic polymers such as polystyrene, polyurethane, polyamide and the like are used as elastic spinning materials, and hydrophobic polymers such as polyacrylonitrile, polysulfone, polytetrafluoroethylene, polyvinylidene fluoride and the like are used as hydrophobic spinning materials; the phase-change heat-storage fluffy fiber is prepared in a high-humidity environment through an electrostatic spinning method. The phase-change heat-storage fluffy fiber synthesized by the method is in a flexible fluffy form and has the advantages of good phase-change stability, low heat conductivity coefficient and the like, and the environmental temperature is kept stable through an accompanying heat absorption or heat release effect when phase change occurs at the phase-change temperature; the material can be used as a thermal insulation filling material and has wide application prospects in human body and environment thermal management and other aspects.

The invention discloses a multi-element sintering aid reinforced zirconia-based heat storage ceramic as well as a preparation method and application thereof. The preparation method of the heat storage ceramic comprises the following steps: taking ZrO2 and Al2O3 as matrix materials, ball-milling and uniformly mixing the matrix materials with a sintering aid, and drying to obtain mixed powder; the matrix material is prepared from the following components in percentage by mass: 70 to 80 weight percent of ZrO2 and 20 to 30 weight percent of Al2O3; the sintering aid is prepared from TiO2, MgO, kaolin and CeO2; sieving the mixed powder, and sequentially performing granulation, aging and forming treatment to obtain a ceramic green body; and sintering the ceramic green body at the temperature of 1500-1600 DEG C to obtain the ceramic. According to the invention, the zirconia-based heat storage ceramic with high strength and high thermal shock resistance is successfully prepared by adopting the combination of multiple cation sintering aids, and the zirconia-based heat storage ceramic can be used as a heat storage material for long-term service in a solar thermal power generation system.

A light-absorbing heat-storage composite material comprises a photo-thermal material and a heat-storage material. The heat-storage material comprises at least one of hydroxide, hydrate, molten salt, and organic phase change heat-storage material. The photo-thermal material comprises brown manganese ore silicate, and the photo-thermal material is used to enhance the absorbance and photo-thermal conversion rate of the heat-storage material, and complete the heat storage at the same time. The invention also provides a method for preparing the light-absorbing heat-storage composite material. The prepared photo-thermal composite material is a photo-thermal storage integrated material that can directly convert light energy into thermal energy and store heat, with small heat energy loss, high photo-thermal conversion efficiency, and cost saving.

The invention discloses a double-phase-change flexible film for solar power generation and a preparation method of the double-phase-change flexible film. According to the method, water-soluble polymers such as polyvinyl alcohol, polyvinylpyrrolidone, polyethylene oxide and the like are used as flexible base materials and are physically blended with vanadium dioxide, freeze drying is performed, then phase change heat storage materials such as fatty acid, alkane, polyethylene glycol, paraffin and the like are subjected to vacuum impregnation adsorption, and the double-phase-change flexible film for solar power generation is synthesized. The double-phase-change flexible film synthesized by the method can realize double phase change in the same phase change temperature zone, has a selective intelligent reflection function on near-infrared light before and after phase change, and has relatively high photo-thermal conversion efficiency, and the synthesis method is simple, safe and easy to prepare. Wide application prospects are realized in the aspects of solar power generation, electronic device heat management, intelligent infrared stealth and the like.

The invention relates to the technical field of heat energy storage materials, and particularly provides a silicon dioxide aerogel composite phase change heat storage material and a preparation method thereof. The method comprises the following steps: mixing an organic silicon source, absolute ethyl alcohol and deionized water according to a specific ratio, fully stirring to obtain a mixed solution, and dropwise adding an acid catalyst into the mixed solution at room temperature for hydrolysis reaction to obtain a hydrolysate; sequentially adding a drying control agent and an alkali catalyst, and standing for gelation reaction to obtain gel; adding an organic solvent to carry out aging reaction, and then adopting the organic solvent to carry out replacement for multiple times to obtain alcogel; replacing the alcohol gel with an organic solvent for multiple times to obtain wet gel, soaking the wet gel in an excessive molten phase change material, and carrying out normal-pressure solvent replacement and drying at 40 DEG C to obtain the phase change material, the loading capacity of octadecane in the obtained CPCM is about 83%, the phase change enthalpy reaches up to 192J / g, the heat conductivity is as low as 0.0812 W / m.K, and no obvious leakage occurs after 200 times of circulation.

The invention discloses a nano phase change heat storage material with high decomposition temperature as well as a preparation method and application thereof, and belongs to the technical field of mixed molten salt energy storage materials. The nanometer phase change heat storage material is composed of 99 wt% of low-melting-point mixed molten salt and 1 wt% of SiO2 nanometer particles. The low-melting-point mixed molten salt is composed of potassium nitrate, sodium nitrite and sodium nitrate according to the mass ratio of 53: (10-30): (17-37). The low-melting-point and high-decomposition-temperature nanometer phase change heat storage material with the melting point being 150-175 DEG C and the decomposition temperature being 660-723 DEG C is prepared by combining the mixed molten salt composed of potassium nitrate, sodium nitrite and sodium nitrate according to the specific dosage ratio with SiO2 nanoparticles, the melting point of the phase change material is low, energy consumption can be effectively reduced, and the energy consumption is reduced. And the composition has good decomposition temperature, melting latent heat and other thermophysical properties.

The invention relates to the technical field of heat storage materials, in particular to a simulation method for strengthening the heat storage performance of molten salt by using nano-particle oxygen vacancy defects. The method comprises the following steps: constructing a unit cell structure of silicon dioxide, determining a nanoparticle model containing a surface oxygen vacancy defect based on the unit cell structure of silicon dioxide, and constructing a final silicon dioxide-potassium carbonate nanofluid model based on the nanoparticle model containing the surface oxygen vacancy defect; performing molecular dynamics simulation based on the final silicon dioxide-potassium carbonate nanofluid model to obtain molecular dynamics simulation data; based on molecular dynamics simulation data, the final heat storage performance parameters of the silicon dioxide-potassium carbonate nanofluid model are determined, and by means of the setting mode, results obtained through simulation discover that the heat storage performance of the molten salt can be effectively improved through nano-particle oxygen vacancy defects.

The invention provides a moon thermoelectric conversion device with a replaceable heat storage body, and belongs to the technical field of moon energy and power generation. In order to solve the core problems of discontinuous energy supply, complex system maintenance and the like in the existing lunar base energy technology, the invention provides a lunar thermoelectric conversion device with a replaceable heat storage body. The heat collection layer of the internal coupling heat pipe and the heat storage material internally provided with the heat conduction copper columns form a cold source and a heat source, cold and heat sources in the moon day and the moon night are exchanged, and the continuous and stable power supply capacity of the moon day period is achieved. The device upper cover of the power generation part is in threaded connection with the device inner container of the heat storage part, modular disassembly and replacement can be achieved under the condition that the multi-stage thermoelectric generator fails, and replacement of the heat storage body can also be achieved. A copper column heat conduction mode is adopted in the vertical direction, the problem that gravity reverse heat transfer performance is poor is solved, and day and night uninterrupted supply of lunar base energy is expected to be achieved.

The invention relates to the field of building heat storage materials, in particular to fly ash-based inorganic phase-change heat storage aggregate based on solid waste utilization and a preparation method of the fly ash-based inorganic phase-change heat storage aggregate. According to the inorganic phase change aggregate, fly ash is selected as a raw material, gel balls are used as a template, fly ash hollow balls are obtained through granulation, drying and sintering, and the hollow balls have good compressive strength; and enabling the fly ash hollow spheres to bear inorganic hydrated salt through a vacuum adsorption method, and packaging for three times to obtain the fly ash-based phase change aggregate. According to the inorganic phase-change aggregate prepared by the method, the fly ash is selected as an aggregate matrix, the gel beads are used as a core material for granulation, water spraying is not needed in the granulation process, and the process flow is simple, low in cost and easy to implement. The inorganic phase change aggregate prepared by the invention has the mechanical strength of the aggregate and also has a phase change heat storage function; and the inorganic hydrated salt phase change material is used, so that the phase change material also has nonflammable performance.

According to the heat stabilizing method of the double-color injection mold, a phase change heat storage unit is arranged in the rotary double-color injection mold and embedded in an annular groove formed in the outer wall of a mold cavity on the movable mold side of the double-color injection mold; a phase change heat storage material is packaged in the phase change heat storage unit, and heat insulation layers are arranged on other outer surfaces of the phase change heat storage unit; the melting point of the phase-change heat storage material is lower than the softening point of the plastic material and higher than the demolding temperature of the plastic material; during first injection molding, a molten first material heated to a first high temperature is injected into the lower-layer mold cavity through a hot runner, and is cooled below the first low temperature to be cured; the phase-change heat storage unit absorbs heat of the mold cavity and starts to melt when the temperature rises to a first low temperature, and temperature rise of the mold cavity is delayed; during secondary injection molding, a molten second material heated to a second high temperature is injected into the upper-layer mold cavity; the phase change heat storage unit controls the temperature of the lower-layer mold cavity to be below the third temperature through latent heat absorption, and the first material is prevented from being softened. Temperature fluctuation of the mold can be balanced, and softening of the first injection molding material caused by sudden temperature drop is prevented.

The invention provides a phosphogypsum-based composite low-temperature heat storage material based on lattice defects and a preparation method of the phosphogypsum-based composite low-temperature heat storage material. The phosphogypsum-based composite low-temperature heat storage material comprises a hydratable calcium sulfate material, a zinc-containing compound and a heat-conducting framework material, wherein the hydratable calcium sulfate material comprises one or more of anhydrous phosphogypsum and semi-hydrated phosphogypsum; the heat-conducting framework material comprises any one of expanded graphite, graphene, carbon nanotubes, boron nitride or silicon carbide. The material prepared by the invention has low phase change temperature, high heat storage density, high heat conductivity and excellent cycle stability, and overcomes the key technical bottleneck of the traditional hydrated salt and ardealite-based heat storage material at one stroke.

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 relates to the technical field of energy and power engineering, and discloses an efficient thermoelectric decoupling system based on phase change energy storage, which comprises an energy storage unit module, a regulation and control algorithm module and a scheduling optimization module. The energy storage unit module adopts a nanotechnology novel phase change material, so that the energy storage density and stability are improved; the regulation and control algorithm module realizes accurate control of charging and discharging through a multi-stage regulation and control strategy; and the scheduling optimization module predicts energy demand and production by using a machine learning algorithm, and dynamically adjusts an energy distribution strategy. The problems that a traditional heat storage material is low in energy storage density and poor in stability and lacks an intelligent scheduling mechanism can be solved, the energy utilization efficiency and operation reliability of a thermoelectric system are improved, and the energy cost is reduced.

The invention discloses a quaternary sulfuric acid molten salt heat storage material based on salt lake resources as well as a preparation method and application of the quaternary sulfuric acid molten salt heat storage material. The preparation method comprises the following steps: freezing and recrystallizing first sulfate type salt lake raw brine to prepare sodium sulfate decahydrate; carrying out evaporative crystallization and recrystallization treatment on the second sulfate type salt lake raw brine to prepare magnesium sulfate heptahydrate; mixing the sodium sulfate decahydrate, the magnesium sulfate heptahydrate, the potassium sulfate and the calcium sulfate, heating to a first dehydration temperature at a first heating rate for first heat treatment, heating to a second dehydration temperature at a second heating rate for second heat treatment, and heating to a melt blending temperature at a third heating rate for third heat treatment, the quaternary sulfuric acid molten salt heat storage material is prepared. The quaternary sulfuric acid molten salt is prepared by a one-step method through a dehydration and coupling technology, so that high-valued utilization of sodium, potassium, magnesium and calcium resources of a salt lake is realized, the process flow is simplified, and the cost is reduced.

The present invention provides a calcium-based thermochemical heat storage material modified with high-entropy fluorite oxide and a preparation method thereof. The material comprises a calcium-based material and a high-entropy fluorite oxide, with the calcium-based material accounting for 70-85% by mass. The calcium-based material is calcium oxide, and the high-entropy fluorite oxide is a fluorite-structured oxide formed by zirconium, cerium, lanthanum, neodymium, and ytterbium, with a molar ratio of 1:1:1:1:1 for the oxides of zirconium, cerium, lanthanum, neodymium, and ytterbium. The invention utilizes the high-entropy fluorite oxide as an anti-sintering component to disperse calcium oxide and prevent its sintering, while simultaneously promoting the adsorption, dissociation, and migration of CO2 on the surface of the material, thereby enhancing the cycling stability and energy density of the heat storage material.

The invention discloses a preparation method of a photo-thermal conversion-phase change heat storage polyurethane flexible film, and relates to the technical field of polyurethane phase change materials. According to the invention, polyethylene glycol is used as a polymeric monomer and a phase change heat storage substrate, diisocyanate and dimethylolbutyric acid are used as reaction monomers, any one of 3, 3-dithio-bis-propionyl hydrazide or (R, R)-3, 3 '-diseleno-bis (2-aminopropionic acid) is used as a cross-linking agent, and transition metal carboxylate and a nano photo-thermal conversion agent are introduced to prepare the phase change heat storage material. And the polyurethane flexible film with photo-thermal conversion-phase change heat storage is prepared. A hydrazide group at the tail end of a cross-linking agent and an isocyanate group are subjected to nucleophilic addition reaction to generate a hydrazide-urea structure of which the main chain contains disulfide bonds and constructs multiple hydrogen bonds, and meanwhile, a metal carboxylate coordination bond is introduced, so that the film is endowed with an excellent mechanical response effect in a wide temperature range; the nano photo-thermal conversion agent is added into the system, so that the system has good photo-thermal conversion performance.

The invention provides a hydrophilic modified porous graphite-based phase change heat storage material and a preparation method thereof, and relates to the technical field of phase change heat storage materials. The hydrophilic oxide layer is constructed on the pore surface of the porous graphite, so that the porous graphite is changed from hydrophobicity to hydrophilicity, and the application limitation caused by original strong hydrophobicity is effectively overcome. The oxide layer is stable in property in a high-temperature environment, the applicable temperature range of the material is remarkably widened, erosion of oxygen to a carbon skeleton can be blocked, the structural integrity of the porous graphite is protected, and the service life of the material is prolonged. The high-enthalpy polar phase change material can be efficiently compounded with the hydrophilic modified porous graphite in a solution spontaneous impregnation manner by virtue of good flowability and permeability of an aqueous solution of the high-enthalpy polar phase change material, so that the preparation process is greatly simplified. The finally prepared hydrophilic modified porous graphite-based phase change heat storage material has high thermal conductivity and high heat storage density, shows excellent comprehensive performance, and solves the problem that a polar phase change substance with a high enthalpy value is difficult to be effectively compounded with porous graphite.