238 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 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 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 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 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 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.

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.

The application provides a kind of shaped phase change material and its preparation method.The phase change material includes the following component materials according to mass percentage: 45.8-56.7% of dodecahydrate disodium hydrogen phosphate, 7.9-22.9% of sodium carbonate decahydrate, 7.6-15.9% of sodium sulfate decahydrate, 2.46-4.05% of reinforcing material, and 15-20% of adsorption material.The preparation of the phase change material includes the following steps: 1, preparing materials;2, preparing inorganic salt mixture;3, preparing molten inorganic salt mixture;4, preparing mixture and sealing;5, preparing shaped phase change material.The shaped phase change material prepared by the application has suitable phase change temperature, higher latent heat of phase change, no liquid leakage, no toxicity and non-combustibility, small supercooling degree, and no phase separation;at the same time, for the application occasions requiring transportation and storage between 20-30℃, the shaped phase change material can be used as an effective normal temperature cold storage agent to resist low temperature environment and protect specific chemicals and medicines from temperature fluctuation.

The invention provides a battery pack with a phase-change material, which comprises: an accommodating frame, the top of which is open and the interior of which is provided with an accommodating space; the plurality of batteries are arranged at intervals along the longitudinal direction of the accommodating frame; the plurality of first isolation plates are arranged in the accommodating space at intervals; wherein the first isolation plate is arranged between any two adjacent batteries, and the first isolation plate is made of a shaped composite phase change material, so that the phase change temperature of the first isolation plate is 24-30 DEG C, and the latent heat of phase change is 160-200kJ / kg. Excess heat is absorbed through the first isolation plate and released when needed, the heat is effectively transmitted to the external environment, and it is ensured that the whole battery pack is maintained within the optimal working temperature range. Therefore, accurate control of the temperature of the battery is realized, and the performance and the safety of the battery are remarkably improved.

The invention provides a method for testing the phase change temperature of a phase change product. The method comprises the following steps: weighing a phase change material with specified mass; clamping the phase change material between two glass plates, horizontally placing the phase change material, and continuously applying constant pressure to the phase change material to obtain a pressurized test body; according to a preset temperature gradient, placing the pressurized test body in a heating device which is set to a target temperature for several times, and carrying out heat preservation for a specified time; or, multiple pressurized test bodies are taken again, the multiple pressurized test bodies are synchronously placed in the heating devices with different target temperatures set according to the preset temperature gradient respectively, and heat preservation is conducted for the designated time; taking out the pressurized test body after keeping the temperature for a specified time, cooling to room temperature, and measuring the diameter of the phase change material to obtain diameter data of the phase change material at different temperatures. The phase change temperature is judged by utilizing the sudden change point of the diameter-temperature curve, a precise instrument is not needed, the cost is low, the operation is simple and convenient, and the problems of expensive equipment, low universality and the like in the prior art are solved.

The invention discloses a recoverable high-enthalpy-value solid-solid phase change material and a preparation method thereof. Solid phase constraint of a liquid phase change material is achieved through a topological entanglement effect generated by a hydrogen bond network and polymer macromolecules. The coupling effect of the two limits the movement between low-molecular-weight phase change material molecules at the phase change temperature, and high-temperature solid-solid phase transformation is achieved. The solid-solid phase change material prepared by the method has a high enthalpy value and also has recoverability. In addition, due to the excellent light absorption capacity of the graphene oxide sheet, the graphene oxide sheet has a potential excellent function in the aspect of solar photo-thermal conversion.

The invention provides a transparent ice block preparation control method and a refrigerator, and the method comprises the steps: responding to an ice making instruction, and controlling an ice making device to execute an ice making process; obtaining the temperature of a water body in an ice-making box in the ice-making device in the ice-making process; when the temperature of the water body enters the phase change temperature interval, a heater is controlled to execute a pulse heating control program, so that transparent ice blocks are obtained; wherein the pulse heating control program comprises the steps of executing pulse heating operation in at least two different phase change temperature sub-intervals in the phase change temperature interval, and controlling the heater to operate in a mode of repeatedly executing heating pulses for multiple times for the phase change temperature sub-intervals. According to the method, heating pulses are repeatedly executed for multiple times in a phase change temperature interval of water, the growth speed and direction of ice crystals are actively intervened, an overflow path is created for dissolved gas, the problem of ice block white turbidity is solved, and high-transparency ice blocks are prepared.

The invention relates to a refrigerator and a control method thereof. The refrigerator comprises a refrigerator body, a storage assembly and a refrigerating system. The box body is provided with a storage chamber. The storage assembly is located in the storage chamber and comprises a phase change material. The refrigerating system is configured to provide cooling capacity for the storage chamber. The phase change temperature and the temperature of the phase change material are obtained. And then according to the phase-change temperature of the phase-change material and the temperature of the phase-change material, the cooling capacity provided by the refrigerating system is controlled so that the deviation value between the phase-change temperature of the phase-change material and the temperature of the phase-change material can be smaller than a preset value. In this way, the supply amount of the refrigerating capacity is controlled according to the temperature of the phase-change material, and therefore the temperature of the phase-change material tends to the phase-change temperature. The phase-change material enables the storage chamber to be at the phase-change temperature stably through cold storage and cold release, the temperature of the storage chamber is not prone to change when the door is opened and closed repeatedly, and stability is good. And the phase change material is used for cold storage and cold release, so that energy consumption can be reduced.

Provided in the present application are a heat-absorbing material and a preparation method therefor, a heat-absorbing part, a battery assembly and an electric device. The heat-absorbing material comprises a carrier, an entrainer and a phase-change component, wherein the phase-change component and the entrainer form a negative azeotrope. The entrainer and the phase-change component in the heat-absorbing material of the present application form a negative azeotrope, such that the phase-change component undergoes phase change when the temperature is lower than the phase-change temperature of the phase-change component, thereby absorbing heat, realizing a heat-absorbing effect, improving the heat-absorbing response speed of the heat-absorbing material, and further improving the usage safety of the battery assembly.

The invention relates to the technical field of train pipeline anti-freezing assemblies, and discloses a plateau train pipeline anti-freezing and cold-resistant device which comprises a pipeline body, a protection assembly is fixedly connected to the center of the pipeline body, jackets are fixedly connected to the left side and the right side of the protection assembly correspondingly, and the pipeline body is arranged in the jackets; movable plates are movably connected to the top side and the bottom side of the interior of the pipeline body, the ends, close to the symmetrical faces of the movable plates, of the movable plates are arc-shaped, a phase-change material is loaded between the two movable plates, the phase-change material is particularly an eutectic mixture, and the phase-change temperature of the eutectic mixture is 3-5 DEG C. Sealing rings are movably connected to the left side and the right side of the clamping sleeve correspondingly. An auxiliary assembly is fixedly connected to the rear end of the protection assembly, a mounting plate is fixedly connected to the center of the interior of the auxiliary assembly, two connecting bases are fixedly connected to the rear sides of the top and the bottom of the auxiliary assembly correspondingly, and the device has the advantages that the heat preservation effect of the device on a pipeline during heat tracing cable maintenance is improved, and a user can use the device conveniently.

The present application relates to the technical field of battery thermal management, in particular to a preparation method of a thermal activation battery with silicon-aluminum alloy high-temperature phase change material; in the preparation method, a certain amount of aluminum powder and silicon powder are selected as raw materials and mixed to obtain a liquid alloy by heating, the liquid alloy is defoamed and degranulated, and finally the bulk alloy is cooled to obtain a block alloy, the block alloy is sliced according to the size to obtain a sheet material, and the sheet material is assembled into the battery body in a layer insertion manner; the alloy phase change material prepared by the present scheme has high thermal conductivity, suitable phase change temperature and phase change enthalpy value, thereby having strong thermal management efficiency, being beneficial to regulating and controlling the surface temperature of the battery and prolonging the service life of the battery; in the present scheme, the alloy phase change material is cut and assembled into the thermal activation battery, and has the advantages of low cost, simple operation, good use effect and the like.

The application provides a phase change temperature control internal curing function aggregate for high-strength concrete and a preparation method thereof, and relates to the technical field of building materials. A phase change material paraffin is arranged in an inner layer, and a heat conduction water storage layer composed of carbon fibers, graphite powder, superabsorbent resin, fly ash, phosphorus slag powder, slag powder, quicklime, polyacrylamide, clear lime water and an additive is coated on the outside to form aggregate granulation and molding. The carbon fibers are connected to the dispersed graphite powder to form a heat conduction net structure with line connection points, improve the heat conduction performance, promote the heat conduction between the internal paraffin and the external environment, and the clear lime water activates the fly ash, the phosphorus slag powder and the slag powder in the ingredients to generate a hydration reaction, thereby constructing the strength of the external structure. When the temperature in the concrete is low, heat is released, the whole process is accompanied by slow water release, the double internal curing functions of temperature control and moisture are realized, the cracking of high-strength concrete caused by high hydration heat and large shrinkage is avoided, and the durability of the high-strength concrete is improved.

The invention belongs to the field of ultra-high performance concrete temperature control, and particularly relates to an ultra-high performance concrete member based on gradient phase change material layering and a preparation method of the ultra-high performance concrete member. The ultra-high performance concrete member comprises an ultra-high performance concrete base body and at least three functional layers. The functional layers are sequentially arranged in the ultra-high performance concrete base body in the thickness direction of the ultra-high performance concrete member. Each functional layer contains a microencapsulated phase change material, and the phase change temperatures of the microencapsulated phase change materials in each functional layer are sequentially reduced in the thickness direction of the ultra-high performance concrete member. The at least three functional layers with different phase transition temperatures are arranged in the thickness direction in a gradient manner, so that accurate matching with the spatial and temporal distribution of the hydration heat of the ultra-high performance concrete is realized. The internal and external temperature difference of the component can be remarkably reduced, the occurrence time of a temperature peak value is delayed, early-stage temperature cracks are effectively inhibited, and the integrality and durability of the component are improved.

The invention discloses a hydrogel-based energy-saving building structure and a preparation method thereof, and relates to the field of functional hydrogel. The energy-saving building structure is used for isolating a first space and a second space, the first space has a first environment temperature, and the second space has a second environment temperature; the energy-saving building structure comprises a first substrate, a first hydrogel layer, an isolation layer, a second hydrogel layer and a second substrate which are arranged in a stacked mode. The first hydrogel layer has a first phase change temperature and a second phase change temperature, and when the first environment temperature is below the first phase change temperature or above the second phase change temperature, the first hydrogel layer is in a non-transparent state; when the first environment temperature is between the first phase change temperature and the second phase change temperature, the first hydrogel layer is in a transparent state; when the temperature difference between the first environment temperature and the second environment temperature is larger than or equal to a preset threshold value, the second hydrogel layer can conduct thermoelectric conversion. According to the energy-saving building structure, annual bidirectional heat management and continuous thermoelectric energy conversion can be achieved.

The invention discloses a precision measurement circuit protection method and device, and the method comprises the following steps: providing an electromagnetic shielding housing which is provided with an accommodation cavity for accommodating a precision measurement circuit; a phase-change material layer is arranged on the inner wall of the accommodating cavity, and the phase-change temperature of the phase-change material is in a normal working temperature interval of the precision measurement circuit; the precision measurement circuit is arranged in the accommodating cavity and is connected with a uniform temperature plate through a heat-conducting medium layer, so that heat generated by the precision measurement circuit can be transmitted to the uniform temperature plate through the heat-conducting medium layer; a temperature detection control unit is arranged and used for detecting the temperature of the vapor chamber in real time; and when the temperature of the uniform temperature plate exceeds a preset threshold value, a temperature control execution mechanism is started to carry out active temperature adjustment on the uniform temperature plate.

The application discloses a kind of high heat-conducting low thermal resistance ceramic sheet materials, preparation method and application thereof, the material includes ceramic substrate and functional coating on the upper surface of ceramic substrate and / or functional coating on the lower surface of ceramic substrate;Ceramic substrate is selected from any one of alumina ceramic sheet, aluminum nitride ceramic sheet, silicon nitride ceramic sheet;Upper functional coating, lower functional coating are PMC phase change material coating and heat-conducting gel coating any combination.The application is coated with functional coating on the surface of ceramic sheet, effectively fills ceramic surface micro gap, significantly reduces interface contact thermal resistance (reduces 50%-89%);PMC coating also has phase change temperature control capacity (phase change enthalpy 50-200J / g), can buffer device transient thermal shock;Coating and substrate are firmly combined, and the thermal resistance change rate is less than 13% after 500 times thermal cycle.The application has the advantages of wide substrate adaptability, high heat-conducting efficiency, excellent insulation performance, simple process and the like.

The utility model discloses an absorption core body with a cool feeling, which comprises a liquid-permeable top layer wrapping material which is a spunbond fiber web or a hot air fiber web; -an underlayer wrapping material; -a reinforcing material between the top layer wrapping material and the bottom layer wrapping material; -a layer of temperature control material on at least one side of the top wrapping material, the layer of temperature control material having a microencapsulated phase change material, the layer of temperature control material having a phase transition temperature of 28 to 36 DEG C. Therefore, the temperature adjusting and energy storing functions can be provided for consumers under the condition that the size or the absorbing function of the absorbing core body is not affected. The utility model further relates to an absorption product with the absorption layer.

The invention provides a flexible phase change energy storage ointment material as well as a preparation method and application thereof, and relates to the technical field of phase change energy storage materials, the flexible phase change energy storage ointment material comprises sodium phosphate dibasic dodecahydrate, water, a crystal structure stabilizer, a phase change form changing agent and a phase change temperature regulator; the crystal structure stabilizer comprises at least one of glycerol, sorbitol, propylene glycol and water-soluble silicone oil; the phase change form changing agent comprises at least one of sodium alginate, gelatin, xanthan gum, water glass, sodium dodecyl sulfate, calcium chloride and sodium bicarbonate. The technical problems that the phase-change temperature of the disodium hydrogen phosphate dodecahydrate is not matched with the thermal management temperature of a human body, the phase-change material is uneven in surface and poor in comfort after liquid-solid phase change, particularly solidification and hardening, and the phase-change material is poor in cycling stability and short in service life are solved, and the effects that all the materials are compounded to play a high-efficiency synergistic effect, and the service life is prolonged are achieved. The flexible phase change energy storage ointment material has the technical effect of being suitable for human body thermal management.

The invention provides a wood adhesive and application thereof, and belongs to the technical field of wood processing. By utilizing the phase change characteristic of sodium acetate, when sodium acetate is applied to wood board processing or damaged wood board repairing, part of sodium acetate can permeate into wood cell cavities and cell wall micropores at the phase change temperature, slender crystals can be formed after cooling, a firm interlocking structure is formed with the surface of a wood board, and the bonding performance is improved; due to the salting-out characteristic of sodium acetate, polyvinyl alcohol can be separated from water, more hydrogen bonds are formed between polyvinyl alcohol, and the adhesive property is further improved; after a bonding interface or a repairing interface is cracked due to external force impact, sodium acetate crystals in the wood adhesive can be molten again at the phase change temperature and permeate into wood cell cavities and cell wall micropores, slender crystals are formed after cooling, a firm interlocking structure is formed again with the surface of a wood board, and self-repairing is achieved.

This invention discloses a steel slag cement stone phase change material and its preparation method. The steel slag cement stone phase change material comprises the following components by weight: 50-65 parts cement matrix; 15-25 parts phase change temperature-regulating steel slag filler; 15-25 parts phase change temperature-regulating mineral filler; the phase change temperature-regulating steel slag filler comprises the following components by weight: 10-15 parts steel slag powder, 3-6 parts first phase change material, and 2-4 parts graphene powder; the phase change temperature-regulating mineral filler comprises the following components by weight: 8-12 parts metakaolin, 3-6 parts second phase change material, and 2-4 parts hexagonal boron nitride. The phase change composite material of this invention can absorb and release heat in different phase change temperature zones to delay road surface heating and reduce peak temperature; the phase change material has high encapsulation efficiency and is not prone to leakage during the melting period; at the same time, it maintains or improves the mechanical strength, wear resistance, and thermal conductivity of the cement matrix, thereby meeting the requirements of road engineering construction and service.

The application relates to preparation and application of inorganic eutectic shaped phase change materials with heat preservation function, belonging to the technical field of phase change energy storage. The inorganic eutectic shaped phase change material takes sodium carbonate decahydrate and disodium hydrogen phosphate dodecahydrate as phase change main body materials, and takes sodium silicate nonahydrate as a nucleating agent, so that the supercooling degree is reduced, and the inorganic eutectic phase change material with low supercooling and no phase separation is prepared. Further, the inorganic eutectic shaped phase change material is prepared by using gaseous SiO2 as supporting material. The material prepared by the application has suitable phase change temperature, higher phase change enthalpy and very low supercooling degree, and has no phase separation phenomenon. Moreover, the synthesis process is simple, and the raw material is low in price. Simulation application test shows that the material has excellent building heat buffering performance, and has wide application prospect in the field of building energy saving.

The invention discloses a method for packaging an n-eicosane phase change material by using three-dimensional porous PVDF (Polyvinylidene Fluoride), and relates to a method for packaging a phase change material. The invention aims to solve the problems of lower packaging efficiency, poorer heat-conducting property and rigidity in a phase-change temperature range when PCMs are packaged by adopting a one-dimensional or two-dimensional structure in the prior art. The method comprises the following steps: 1, preparing a PVDF solution; 2, mixing of BN and PVDF; 3, preparing a PB porous hybrid membrane; and 4, performing vacuum impregnation. The method is used for packaging the n-eicosane phase change material through the three-dimensional porous PVDF.

The invention provides an isothermal amplification heating device and method based on a phase change material, and relates to the technical field of biological detection.The device comprises a supersaturated solution container used for containing a supersaturated hydrated salt solution, and the hydrated salt solution releases heat when triggering crystallization; the phase change material layer wraps the supersaturated solution container, the phase change temperature of a phase change material is matched with the target isothermal amplification temperature, and the phase change material layer is used for absorbing heat released by hydration salt solution crystallization and maintaining the constant temperature through solid-liquid phase change; the reaction container is arranged in the phase change material layer and is used for loading a nucleic acid amplification reagent, and constant-temperature heating is realized through heat conduction of a phase change material; and the triggering device is used for triggering crystallization heat release of the supersaturated hydrated salt solution. By combining isothermal amplification and the nucleic acid detection test strip, the purpose of nucleic acid visual detection without a power supply and an instrument is achieved, and the purposes of no external power supply, no thermal sensor, low cost and portability of the device are achieved.