417 results about "Phase change temperature" patented technology

The invention relates to an AI-driven intelligent design and preparation method of an inorganic hydrated salt phase change material, and solves the problem that the traditional technology is mainly based on experience trial and error and single performance optimization and cannot give consideration to multi-performance balance and multi-scene efficient adaptation development requirements of the inorganic hydrated salt phase change material. The method comprises the following steps: acquiring multi-dimensional performance requirements (including phase change temperature, latent heat value and the like) of a material, generating a candidate formula and a prediction result by using a trained Gaussian process regression model, and performing multi-objective optimization to screen out a Pareto optimal formula; and carrying out experimental verification and calculating deviation, retraining the model by complementary data exceeding a threshold value, and determining a final formula after reaching the standard so as to be matched with continuous process large-scale preparation. The method has the advantages that the AI replaces experience trial and error, multi-performance cooperation of materials is achieved, the research and development period is greatly shortened, the cost is reduced, and the method is suitable for multiple energy storage scenes.

The invention discloses a preparation method of a composite phase-change temperature-adjusting organic fiber membrane with a flexible core-shell structure, and belongs to the field of intelligent textile materials.The preparation method comprises the following steps that polyacrylonitrile (PAN) serves as a sheath layer material, n-octadecane serves as a core layer phase-change material, and the composite phase-change fiber membrane is prepared through a melt spinning method and a coaxial electrostatic spinning technology. According to the invention, the fiber membrane with high melting enthalpy value (171.6 J / g), excellent thermal stability (the latent heat is still 117.7 J / g after 100 times of heating-cooling circulation) and excellent mechanical properties (the tensile strength is 2.418 MPa, the tensile yield stress is 2.331 MPa, the tensile strain at break is 36.5%, and the elastic modulus is 58.226 MPa) can be prepared; a new thought is provided for preparing intelligent textiles with good flexibility and efficient heat management capability.

The embodiment of the invention provides a composite phase change heat storage material and a preparation method, the composite phase change heat storage material is a microcapsule with a core-shell structure, the core is a metal iron microsphere, and the metal iron microsphere is used for storing heat through phase change in the heat storage and release process of an energy storage system; the shell is a metal oxide with high-temperature stability and a high heat conductivity coefficient, and the shell is used for packaging the metal iron microspheres and serving as a heat-conducting medium in the heat storage and release process of the energy storage system. According to the embodiment of the invention, the composite phase-change heat storage material has extremely high phase-change temperature and relatively large energy storage density, the phase-change material is not easy to leak after phase change through a packaging technology, and the service life of an energy storage system can be prolonged by adopting the composite phase-change heat storage material.

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 provides a unit cell structure design method and device based on nickel-titanium shape memory alloy, and relates to the technical field of intelligent materials and structures.The method includes the steps that relevant characteristic parameters of nickel-titanium alloy are collected, a mechanical property index, a thermal stability index and a reliability index are generated, and then a phase change temperature index is obtained through comprehensive calculation; and the phase change temperature threshold is corrected, the geometrical shape and the bonding mode of the unit cell structure are determined, and the quasi-zero-stiffness curved beam, the supporting frame and the connecting part of the unit cell structure are optimally designed in combination with the corrected phase change temperature threshold. According to the method, through characteristic parameter pretreatment, mechanical property index calculation and unit cell structure geometric optimization of the nickel-titanium shape memory alloy, the excellent performance under different phase change states is achieved, and the buffering energy absorption and low-frequency vibration isolation functions of the alloy are improved.

The invention discloses a phase-change material loaded steel fiber as well as a preparation method and application thereof, and belongs to the technical field of concrete preparation. Paraffin and the like are used as phase-change materials, the phase-change temperature of the phase-change materials is well matched with the peak value of hydration heat of concrete, a large amount of heat can be absorbed in the hydration process of the concrete, the internal temperature rise of the concrete is effectively reduced, the temperature stress is reduced, and cracks are inhibited; the steel fiber loaded with the phase-change material is subsequently doped into the concrete according to the doping amount of 40-60kg / m < 3 >, and the reinforcing effect of the steel fiber and the temperature control effect of the phase-change material have a synergistic effect, so that the strength and toughness of the concrete are remarkably improved, and the concrete has better mechanical properties and durability; an innovative thought and an effective way are provided for preparation of a high-performance concrete material, and the method has a wide application prospect and huge economic benefits in the field of constructional engineering.

The invention provides a method, medium and equipment for evaluating stability evolution of an unsaturated soil slope in a cold region, and establishes a framework combining a soil-atmosphere interaction model and a cold region unsaturated soil water-steam-heat coupling transmission model. A finite element transient simulation program for simulating the water-heat state response of the unsaturated soil body in the cold region under the action of long-term and short-term climates is developed, and the technical problem that when a traditional numerical model simulates the sand freezing and thawing phenomenon, the latent heat release amount is prone to losing due to the narrow phase change temperature interval is solved. According to a limit analysis upper limit theorem, a slope stability evaluation method is established by adopting a discretization recursion technology, and a novel iterative solution scheme combining a dichotomy and a meta-heuristic optimization algorithm is innovatively provided. A finite element transient analysis model-stability evaluation coupling method is provided, so that the stability evolution evaluation of the unsaturated soil slope in the cold region driven by climate data can be carried out.

The invention relates to the technical field of lead-based stacks, in particular to a nuclear storage integrated lead-based stack with a load autonomous following function. The nuclear storage integrated lead-based reactor with the automatic load following function comprises a reactor core, a phase change energy storage device and a heat energy utilization device, the reactor core is used for heating a coolant; the heat energy utilization device is used for absorbing heat in the coolant; the phase change energy storage device is arranged on the inlet side of the reactor core, the phase change energy storage device is used for carrying out heat interaction with a coolant, and the phase change temperature of the phase change energy storage device is consistent with the preset inlet temperature of the reactor core. According to the nuclear storage integrated lead-based reactor with the automatic load following function, natural circulation flow is not prone to oscillation and diffusion, the risk of overheating melting of the fuel assembly is not prone to occurring, thermal fatigue of the structural assembly is not prone to occurring, and high safety performance is achieved.

The invention discloses an energy conservation and emission reduction system for an annealing furnace, which relates to the technical field of heat treatment, and comprises a target fitting module for performing parameter matching and fitting on a multi-dimensional environment feature vector and an annealing process constraint parameter set to form a heat treatment target function, and performing optimization solution to obtain a target temperature control interval; the control strategy module is used for carrying out multi-target control strategy calculation on the phase change temperature control window information through a heat treatment target function to obtain a dynamic temperature control path in a temperature rise stage; and the execution regulation and control module is used for controlling an annealing furnace heating execution mechanism according to the dynamic temperature control path, adjusting fuel gas input, an air proportion and a flow rate, adopting infrared thermal imaging and a distributed thermocouple to jointly measure the temperature of a temperature zone, obtaining temperature deviation data, carrying out constant-temperature heat preservation and self-adaptive cooling, and generating a multi-section cooling control instruction. Key requirements such as the heating rate, the heat preservation time and the structure property are fully considered, the control precision and the energy efficiency utilization rate of the annealing process are effectively improved, and the energy-saving and emission-reducing effects are remarkable.

The invention relates to the technical field of energy utilization, and provides a temperature adjusting method, device and equipment based on a phase change energy storage system and a storage medium, and the method comprises the steps that in the off-peak period of a commercial building, energy storage is conducted through the phase change energy storage system, the phase change energy storage system is packaged in a layered mode through multiple types of phase change materials, different types of phase change materials correspond to different phase change temperature intervals; temperature adjusting requirements corresponding to different areas in the commercial building are obtained; based on a dynamic deployment algorithm of artificial intelligence, determining the type, the number and the deployment position of the phase change unit required by each region according to the temperature adjustment requirement and the phase change temperature characteristics of the multi-type phase change material; and in the peak period of the commercial building, based on the temperature adjusting requirement, the phase change energy storage system is controlled to adjust the temperature of each area through the phase change unit according to the stored energy. According to the invention, efficient utilization of energy can be realized, and the problems of low energy utilization rate, slow temperature regulation speed, inaccurate temperature control and the like of commercial buildings in peak periods in the prior art are solved.

The invention relates to the technical field of material testing, and discloses a phase change temperature calibration method and system for a phase change material, and the method comprises the steps: collecting the surface temperature distribution data and crystal structure parameters of the phase change material based on a bimodal synchronous monitor, and building a temperature-structure incidence matrix; when the parameters of the crystal structure suddenly change, determining surface temperature distribution data corresponding to a sudden change moment based on the temperature-structure incidence matrix, and calculating an initial phase change temperature interval; constructing a nonlinear mapping model of the initial phase-change temperature interval and the heating rate, and performing dynamic compensation on the initial phase-change temperature interval based on the nonlinear mapping model to obtain a corrected phase-change temperature; inputting the corrected phase change temperature into a gradient temperature control module containing a standard sample; and comparing the offset of the actual phase change position and the theoretical position of the reference material, and reversely correcting and correcting the phase change temperature based on the offset to obtain the final calibration temperature. The calibration accuracy of the phase change temperature of the phase change material can be improved.

The invention provides a polyurethane-based solid-solid phase change temperature adjusting material for a summer asphalt pavement suitable for multiple climate regions and a preparation method thereof, the reaction raw materials comprise polyethylene glycol, isocyanate and a curing agent, the molecular weight of the polyethylene glycol is 10000 and / or 20000; the molar ratio of isocyanate to polyethylene glycol is (10-20): 1; the molar ratio of the curing agent to the isocyanate is 1: (6-12); the phase-change temperature of the obtained polyurethane-based solid-solid phase-change temperature-adjusting material is 37-54 DEG C, and the polyurethane-based solid-solid phase-change temperature-adjusting material is kept in a completely solid state and leakage-free state at 190 DEG C. The phase change temperature range of the PUSSPCM material is suitable for summer asphalt pavements in different climate areas, good leakage resistance can still be kept in the high-temperature construction environment of the asphalt pavements, it can be ensured that the PUSSPCM material is free of leakage in the application process of the asphalt pavements, and meanwhile the PUSSPCM material can be suitable for effective temperature adjustment of the southern and northern asphalt pavements in China in summer.

The invention provides a phase change-moisture absorption and drainage composite roadbed structure in a seasonal frozen region and an intelligent regulation and control method, and relates to the technical field of roadbed design and renovation. The roadbed structure is characterized in that a plurality of gradient phase change material layers are arranged on the top surface of a roadbed surface layer; the multi-layer gradient phase change material layer, the high moisture absorption and drainage geotextile layer and the drainage pipe system are arranged from top to bottom; the phase change temperature intervals and the phase change latent heat of the phase change layers in the multiple gradient phase change material layers are different; the high moisture absorption and drainage geotextile layer is used for guiding water in the soil body into the drainage pipe system; the drainage pipe system is of a porous structure with the inclination angle within the set angle range and is used for guiding water in the soil into the drainage ditch. And the intelligent regulation and control system is used for dynamically regulating the thermal resistance of each phase change layer and the opening degree of the drainage pipe. According to the invention, the time of the roadbed in a relatively stable physical state can be prolonged, so that the purpose of preventing and treating winter frost heaving, frost boiling and mud rising in a spring melting period and other diseases caused by temperature change of the roadbed in severe cold areas is achieved.

The invention discloses anti-crack and anti-alpine concrete and a preparation method thereof, and relates to the technical field of concrete.The anti-crack and anti-alpine concrete is prepared from, by mass, 300-500 parts of low-heat Portland cement, 50-100 parts of carbon sequestration composite superfine powder and 10-20 parts of nano calcium carbonate; the magnesium oxide is calcined at the temperature of 500 to 600 DEG C, is compounded with the calcium sulphoaluminate, and is modified by a silane coupling agent; the phase change microcapsule is formed by packaging paraffin in a silicon dioxide shell layer, and the phase change temperature ranges from-30 DEG C to 10 DEG C; the microbial self-repairing capsule is characterized in that bacillus pasteurii is coated in a sodium alginate-montmorillonite composite carrier; according to the invention, the multi-dimensional performance breakthrough of the high-cold concrete is realized through gradient expanding agent compounding, fiber synergistic enhancement, phase change microcapsule temperature control and microbial self-repairing technologies. The drying shrinkage is reduced to 1.2 * 10 <-4 > by compounding magnesium oxide / calcium sulphoaluminate, the crack propagation is inhibited by a fiber network, and the initial crack threshold value is less than 0.15 mm.

The invention belongs to the technical field of energy storage materials, and particularly relates to a phase change energy storage material and a preparation method thereof.The phase change energy storage material is prepared from 8-12 parts of phase change wax, 10-15 parts of ZnAl-LDH, 6-9 parts of SiC-CuS and 8 parts of polyethylene glycol dimethyl ether; according to the invention, the double-metal hydroxide and the phase-change wax are combined, interlayer water molecules and ionic bonds of the double-metal hydroxide can realize reversible phase change, the phase-change wax can be supported to reduce high-temperature flowing, the phase-change wax makes up for insufficient latent heat and improves energy storage capacity, and the combination of the double-metal hydroxide and the phase-change wax widens the phase-change temperature range and enhances cycle stability; in addition, Si-C loaded CuS nanosheets are introduced, energy can be transmitted under illumination or heat energy to assist storage, the smaller the size of the nanosheets is, the larger the specific surface area is, more active sites can be provided, the heat conduction efficiency is improved, complementation of all advantages of the material is achieved through a simple method, and good comprehensive performance is achieved.

The invention discloses a dynamic self-adaptive radiation refrigeration material which comprises the following components in percentage by mass: 15-30% of matrix resin, 40-60% of a ternary function system, 1-3% of a dispersing agent, 2-5% of a cross-linking agent and the balance of deionized water, the ternary function system is composed of a temperature-sensitive block copolymer, phase change microcapsules and rare earth doped infrared emission particles according to the mass ratio of (1-2): (2-3): (1-1.5). According to the refrigeration material, when the environment temperature is higher than the low critical solution temperature of the temperature-sensitive copolymer, the temperature-sensitive chain segment shrinks to expose the rare earth particles, so that high reflectivity of sunlight and high emissivity of an atmospheric window are realized, and refrigeration is enhanced; when the temperature is lower than the phase-change temperature of the phase-change material, the temperature-sensitive chain segments stretch and wrap the rare earth particles, the infrared emissivity is reduced, heat loss is reduced through phase-change heat release, the dual functions of efficient refrigeration in summer and heat loss reduction in winter are achieved, and the applicability of the coating in an area with the large temperature difference is improved.

The invention belongs to the technical field of building glass and coating materials thereof, and discloses a one-step chemical synthesis method of W-VO2 (M) nano-particles and application of the W-VO2 (M) nano-particles in thermochromic smart windows.The method comprises the steps that firstly, ammonium metavanadate, hydrazine hydrate and ammonium metatungstate serve as raw materials, tungsten-doped M-phase vanadium dioxide nano-particles are chemically synthesized through a one-step hydrothermal method, and the tungsten-doped M-phase vanadium dioxide nano-particles are prepared; the obtained W-VO2 (M) nanoparticles are high in crystallinity, small in particle size (10-40nm), high in purity and low in phase change temperature; then, by taking a polyvinylpyrrolidone material as a parent material, uniformly distributing the W-VO2 (M) nanoparticles in PVP (Polyvinyl Pyrrolidone) to form a uniformly dispersed thin film; according to the application of the W-VO2 (M) nanoparticles in the thermochromic intelligent window, not only can high visible light transmittance be obtained, but also the solar energy regulation and control capability of the W-VO2 (M) nanoparticles can be improved, and the application of the W-VO2 (M) nanoparticles in the fields of the thermochromic intelligent window and radiation refrigeration is further promoted.

The invention belongs to the technical field of concrete, and particularly relates to green high-strength concrete and a preparation method thereof.The preparation method comprises the steps that an organic phase-change material with the phase-change temperature being 0-10 DEG C is taken and packaged with a polymethyl methacrylate shell, and organic microcapsules are prepared; taking an inorganic phase-change material with the phase-change temperature of 50-95 DEG C, and packaging the inorganic phase-change material with a urea-formaldehyde resin shell to prepare an inorganic microcapsule; the organic microcapsules and the inorganic microcapsules are mutually combined to form microcapsule pairs; coating the micro-capsule exterior with a silicon dioxide shell to obtain phase change particles; and mixing the phase change particles into the concrete to obtain the high-strength concrete. The green high-strength concrete disclosed by the invention contains two phase change materials with different phase change temperatures, so that heat can be stored during internal temperature rise, and the temperature rise rate in the concrete is effectively reduced; meanwhile, the low temperature of the outer wall needs to be relieved, the freezing damage influence is relieved, the internal and external temperature difference is reduced, caused thermal stress is reduced, and therefore the cracking risk is reduced.

The invention discloses a mass concrete temperature control construction method and system based on phase change energy storage, and the method comprises the steps: S100, building a BIM model for a concrete member pouring region according to a design size, setting a temperature sensor in a concrete member to monitor data in real time, and predicting a temperature field in combination with the BIM model; s200, the space between the conventional cooling water pipe and the concrete protection layer is filled with phase change microcapsules in a gradient density mode, a phase change energy storage buffer layer is formed, and transfer of heat to the interior of the concrete member is delayed; s300, according to the predicted temperature field, the water inlet flow and the water temperature are dynamically adjusted, the temperature peak is controlled, and the cooling rate is controlled; s400, fiber grating sensors are arranged at the four corners and the midspan of the concrete member, and the strain change rate is detected; and S500, establishing a digital twin temperature control platform, integrating temperature, humidity and strain data, constructing a three-dimensional thermodynamic model, predicting the temperature rise trend of the concrete member, and performing adaptive regulation and control on the temperature. Temperature difference inside and outside the concrete is controlled through phase change temperature control.

The invention discloses a heat-treatment-free control method for inhibiting hydrogen-induced cracks in ultrahigh-strength steel welding, which belongs to the technical field of welding, and enables weld metal to obtain a low-phase-transition-temperature characteristic and a double-phase structure containing retained austenite under a specific dilution rate window by cooperatively regulating and controlling components of a welding material and welding process parameters. Therefore, preheating-free and post-heat-treatment-free efficient welding of the ultrahigh-strength steel is achieved. According to the method, the volume expansion effect generated by low-temperature martensite phase transformation of weld metal is utilized to actively counteract restrained tensile stress formed by welding cooling shrinkage; on the other hand, the effect of the retained austenite serving as an efficient'hydrogen trap 'is fully played, migration and enrichment of hydrogen to crack sensitive areas such as a heat affected zone or a fusion line are effectively blocked, and finally effective inhibition of hydrogen-induced cracks in ultrahigh-strength steel welding is achieved; the obtained welding joint is free of hydrogen-induced cracks and has the mechanical property level well matched with base metal.

The present invention relates to the field of material testing technology and discloses a method and system for calibrating the phase change temperature of a phase change material. The method comprises: collecting surface temperature distribution data and crystal structure parameters of the phase change material using a dual-modal synchronous monitor and establishing a temperature-structure correlation matrix; determining the surface temperature distribution data corresponding to the mutation moment based on the temperature-structure correlation matrix when the crystal structure parameters undergo a sudden change, and calculating the initial phase change temperature range; constructing a nonlinear mapping model between the initial phase change temperature range and the heating rate, and dynamically compensating the initial phase change temperature range based on the nonlinear mapping model to obtain a corrected phase change temperature; inputting the corrected phase change temperature into a gradient temperature control module containing a standard sample; comparing the offset between the actual phase change position of the reference material and the theoretical position, and reversely correcting the corrected phase change temperature based on the offset to obtain a final calibration temperature. The present invention can improve the accuracy of phase change temperature calibration of phase change materials.

The invention relates to a heat management device and a vehicle, the heat management device comprises a first phase change material piece, a second phase change material piece and a third phase change material piece, the first phase change material piece and the second phase change material piece are both used for storing heat, and the third phase change material piece is used for storing heat. The phase change temperature of the first phase change material piece is different from that of the second phase change material piece; and the third phase change material piece is used for storing cold. The first phase-change material piece and the second phase-change material piece which are different in phase-change temperature are arranged to conduct heat storage on the distributed heat sources different in temperature, so that waste heat different in temperature is effectively recycled to improve the heat energy utilization efficiency, and heat at the proper temperature is provided when heat is needed to reduce heating energy consumption; and a third phase-change material piece used for cold storage is arranged, and when the refrigeration requirement is met, the refrigeration energy consumption is reduced by utilizing the stored cold capacity to meet part of the refrigeration requirement, so that the energy utilization rate is increased, and the heat management energy consumption is reduced.

The invention discloses a wide and thick steel plate for a 600MPa-grade corrosion-resistant anti-fatigue marine tendon pipe and a production method of the wide and thick steel plate. According to the component design of the wide and thick steel plate, CEIIW is controlled to be 0.37%-0.42%, and CEPcm is controlled to be 0.14%-0.18%; the low-Nb and Mo-free design is adopted, the phase change temperature is increased, and phase change of polygonal ferrite is promoted; rE is fully utilized to exert the effects of solid solution, interface segregation and the like, grains are refined, the interface energy is reduced, and the corrosion resistance is improved; on the basis of component design, the production methods of low-temperature heating, rough rolling multi-stage thickness section high-temperature gradient deformation and low-temperature rolling, intermediate temperature-waiting blank rapid cooling after rough rolling is finished, finish rolling low-temperature deformation, multi-stage water cooling and the like are adopted to obtain a microstructure of polygonal ferrite, granular bainite and acicular ferrite; and the average deformation austenite height does not exceed 18 microns, and the proportion, the size and the distribution of each phase are ideally controlled, so that the method plays an important role in obtaining good comprehensive performance of the steel plate.

The invention relates to the technical field of phase change energy storage, and discloses a phase change energy storage material and application thereof. The phase change energy storage material composition comprises inorganic salt in an anhydrous form and / or a hydrate form, a phase change temperature regulator and optional water, wherein the phase change temperature regulator comprises a water-soluble salt and a polyhydric alcohol. The components of the composition are uniformly mixed to obtain the phase change energy storage material. The polyol which is in a liquid state at room temperature is added into the hydrated salt-based phase change energy storage material, so that the phase change temperature of the phase change energy storage material can be remarkably changed, the limitation that the phase change temperature can be reduced only by adding inorganic salt in the prior art is broken through, and the polyol and the inorganic salt can cooperatively regulate and control the phase change temperature of the phase change energy storage material. In addition, the phase change energy storage material provided by the invention can keep a low cold storage / heat storage attenuation rate after multiple solidification-melting phase change cycles.

The invention discloses a decanoic acid-myristyl alcohol phase change material as well as a preparation method and application thereof, and belongs to the technical field of energy storage phase change materials. The preparation method comprises the following steps: firstly, mixing capric acid and myristyl alcohol, carrying out heat treatment to prepare a binary eutectic mixture, then adsorbing the obtained binary eutectic mixture into hollow open steel balls through an impregnation method, cooling, drying, and finally packaging to obtain the hollow open steel balls. The phase-change temperature range of the prepared composite phase-change material is 18.30-20.86 DEG C. Compared with the phase-change temperature of a traditional phase-change material, the phase-change temperature range suitable for organic matters is effectively widened, good thermal characteristics of a single component are kept, the composite phase-change material better conforms to the working environment of an underground energy structure, and the working efficiency is improved. Meanwhile, the graphite powder is doped, so that a plurality of heat conduction channels are formed in the phase-change concrete, and the heat exchange capacity of the phase-change concrete is effectively improved.

The invention discloses an electrode slurry dynamic curing method. Rapidly heating a current collector-slurry interface to 100-120 DEG C by adopting electromagnetic induction, and triggering adhesive crosslinking and thermal expansion microspheres to generate pre-compressive stress; stress is relieved through phase change microcapsules in the hot air drying process of 70-90 DEG C; and finally, curing is completed at the temperature of 110-130 DEG C. The electrode slurry comprises thermal expansion microspheres and phase change microcapsules; the initial expansion temperature of the thermal expansion microspheres is 75-105 DEG C, and the phase change temperature of the phase change microcapsules is 45-65 DEG C; by reversing a traditional curing path and combining thermal expansion microspheres and phase change microcapsules with specific temperature response, the problems of demolding and cracking caused by negative electrode drying stress are solved, the interface integrity is remarkably improved, and the cycle life is remarkably prolonged.

A phase change material composition for latent heat storage is provided. The composition includes a eutectic mixture of two or more salt hydrates, and at least one salt additive each selected from a bromide salt and a bromide salt hydrate. The mixture of salt hydrates has a melting temperature above room temperature. The at least one salt additive decreases the melting temperature of the mixture and reduces a degree of supercooling of the mixture. The mixture of salt hydrates may be a mixture of calcium chloride hexahydrate and magnesium chloride hexahydrate. The salt additives may include both calcium bromide and magnesium bromide. The melting temperature of the phase change material composition may be in a range of approximately 15 to 25° C. A thermal energy storage system including the phase change material composition and a method of heat management in the thermal energy storage system are also provided.

The invention discloses a coal cinder packaging high-temperature phase change material method for efficient waste heat recovery, which comprises the following steps: adding a fluxing agent into liquid slag, and reheating until the liquid slag is completely molten, so that the liquid temperature of the slag is higher than the phase change temperature of the phase change material; and the metal phase change particles are evenly wrapped with the liquid slag, the metal phase change particles wrapped with the slag are subjected to heat exchange with cooling water, the particles release heat and are cooled and solidified, and the packaging structure is formed. The invention further discloses a coal cinder packaging high-temperature phase change material device for efficient waste heat recovery. According to the invention, the high-temperature metal phase-change material is used as a core, and the industrial solid waste slag is used as a packaging shell, so that a unique macroscopic packaging structure is formed; the high-temperature characteristic of the liquid slag generated in the industrial process can be fully utilized, and the liquid slag is used as a heat source in the sintering process, so that heat energy is recycled.

The invention discloses a thermochromic phase change film with a repairable function, which is characterized in that polyvinyl alcohol PVA and boric acid BA are used as raw materials for crosslinking, thermochromic ink is used as a color change material, polyethylene glycol PEG-8000 is used as a phase change material, and the thermochromic film PBTP-M with the repairable function is prepared by a one-step method based on physical pouring; meanwhile, the material has repairable performance, reversible thermochromism performance and phase change performance; the repairable performance can be quickly recovered to an initial state by adding water and drying; the color change temperature of the reversible thermochromism performance is 50 DEG C; according to the phase change performance, the phase change temperature ranges from 22.67 DEG C to 53.76 DEG C, the phase change enthalpy value ranges from 55.583 J / g to 78.679 J / g, and the heat conductivity coefficient ranges from 0.6827 W / (m.K) to 0.8643 W / (m.K). The preparation method comprises the following steps: mixing PVA, BA, TC and PEG-8000 by adopting a one-step method based on physical pouring, and then carrying out physical pouring.

The invention discloses a compressed air energy storage underground cavern temperature adjusting structure and a manufacturing method thereof, and belongs to the technical field of compressed air energy storage, the temperature adjusting structure is sequentially provided with a flexible sealing layer, a phase change temperature adjusting layer and an optical fiber sensing layer from inside to outside, the optical fiber sensing layer is connected with the inner wall of a concrete lining, and the phase change temperature adjusting layer is used for stabilizing temperature fluctuation in a cavern; the optical fiber sensing layer is used for monitoring temperature and a strain field in real time and is electrically connected with an external fiber grating sensor grid monitoring system through a sensor lead. According to the method, latent heat can be absorbed or released through the phase change process, temperature fluctuation in the cavern can be effectively stabilized, material fatigue and structural damage caused by thermal stress circulation are reduced, real-time monitoring of the temperature and strain of the sealing layer is achieved, and the sensing capacity and the early warning level of the operation state of the cavern are improved.