338 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 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 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 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 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 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 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 invention discloses phase change temperature control composite mortar and a phase change temperature control anchor rod construction method, and belongs to the technical field of underground engineering surrounding rock supporting. The phase change temperature control composite mortar comprises cement, fine sand, water, a phase change material and heat conduction powder; the construction method comprises the following steps: drilling an excavated bed rock to form an anchor rod drill hole; a sectional type anchor rod is arranged in the anchor rod drill hole in a penetrating mode, wherein the sectional type anchor rod is divided into an anchoring section and a non-anchoring section; cement mortar is used for grouting the anchoring section through a grouting pipe, and grouting is stopped when the interface between the anchoring section and the non-anchoring section is reached; and after the slurry of the anchoring section is hardened, the phase-change temperature-control composite mortar is heated, then the phase-change temperature-control composite mortar is injected into the non-anchoring section through the grouting pipe, the single-hole grouting pressure reaches the designed final pressure, grouting continues for a period of time, and then grouting is ended. The method can adapt to frequent changes of surrounding rock temperature, and surrounding rock damage and anchor rod failure caused by temperature stress accumulation of surrounding rock are avoided.

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 relates to a stepped phase change battery thermal management system which is characterized by comprising a battery module, a liquid cooling plate and a stepped phase change material, the battery module comprises more than one single battery, the single batteries are arranged adjacently, and a phase change space is reserved between the adjacent single batteries; the liquid cooling plates are arranged at the end parts of the single batteries; the stepped phase change material comprises a first phase change material and a second phase change material, the first phase change material and the second phase change material are arranged in the phase change space, the first phase change material is located in the direction, away from the liquid cooling plate, of the phase change space, and the second phase change material is located in the other direction of the phase change space and makes contact with the liquid cooling plate; the phase change temperature of the first phase change material is higher than that of the second phase change material. The method is characterized in that a stepped phase change material is adopted, in the process of cooling the battery by liquid cooling, the balance of the internal temperature of the battery is kept, the service life of the battery is prolonged, and the service power of the battery is guaranteed.

The invention discloses a load fluctuation type steam heat preservation pipeline based on phase change heat storage and a method thereof. According to the heat preservation pipeline, a phase change heat storage heat preservation layer, a multi-layer heat preservation layer and an outer protection layer are sequentially and coaxially laid on the outer wall of a working pipe; the phase-change heat-storage heat-preservation layer is assembled on the outer wall of the working pipe through phase-change heat-preservation heat-storage units in a tongue-and-groove splicing mode, and the phase-change temperature of the phase-change material filled in each phase-change heat-preservation heat-storage unit is located between the steam saturation temperature and the working temperature under the stable working condition. By means of the thermal resistance self-adaption characteristic of the phase change material, the thermal resistance effect is dynamically enhanced in the phase change process, and a dual-heat-preservation mechanism of heat dissipation blocking and delaying between a high-temperature medium in the working pipe and the environment is achieved. And meanwhile, circulating heat storage and release of the phase change heat storage heat preservation layer are achieved through a heat source of the pipeline, and a zero-energy-consumption self-operation mode is formed. The method can be widely applied to various high-temperature steam pipe networks, is particularly suitable for industrial scenes with load fluctuation, and can reduce heat loss and improve the operation stability of the pipe networks.

The invention provides a self-adaptive intelligent heat dissipation plate based on a multi-layer composite phase change material and a spiral flow channel, and relates to the field of heat management. The intelligent heat dissipation plate based on self-adaption of the multi-layer composite phase-change material and the spiral flow channel comprises the multi-layer composite phase-change material, the spiral fractal flow channel, an intelligent regulation and control system and a modular unit, the multi-layer composite phase-change material is composed of at least three nanometer modified materials with different phase-change temperatures, and the temperature range covers-20 DEG C to 150 DEG C. According to the multi-layer composite phase change material and spiral flow channel self-adaptive intelligent heat dissipation plate, through the design of the multi-layer composite phase change material and the spiral flow channel and an intelligent regulation and control system, efficient heat dissipation and dynamic temperature adaptation are achieved, and the multi-layer composite phase change material and spiral flow channel self-adaptive intelligent heat dissipation plate is suitable for high-power electronic equipment, new energy batteries, aerospace equipment and other scenes; the heat dissipation efficiency is improved by 40%-60% compared with that of a traditional phase change heat dissipation plate, and the temperature uniformity is improved by 50%; adaptability: supporting a wide temperature range from-40 DEG C to 200 DEG C, and adapting to multiple industry scenes; energy consumption: the power consumption of an AI regulation and control system is less than 5W, and the energy is saved by 30% compared with that of a fixed flow channel.

The invention belongs to the technical field of heat storage systems in solar heating systems, and particularly relates to a composite phase change material and a preparation method and application thereof. The composite phase change material is prepared from the following components in percentage by mass: 4% of expanded graphite, 1%-5% of modified expanded graphite and the balance of 1-octadecanol, totaling 100%, the modified expanded graphite is expanded graphite modified by an aluminate coupling agent. Through the synergistic effect of the modified expanded graphite and the expanded graphite, the heat transfer performance of the composite phase change material can be effectively improved; after 200 times of thermal cycles, the phase change temperature and phase change latent heat of the composite phase change material are almost unchanged, and the composite phase change material shows good thermal cycle stability.

The invention provides an intelligent refrigeration system utilizing electro-thermal conversion and phase change energy storage, the intelligent refrigeration system comprises a phase change structure and an intelligent temperature control system, the phase change structure is arranged on a building body, and the temperature of the phase change structure during phase change is the phase change temperature; the intelligent temperature control system comprises a temperature detection device, an intelligent control system and a refrigeration device; the temperature detection device is connected with the intelligent control system, and the intelligent control system is electrically connected with the refrigeration device; the temperature detection device is used for measuring the indoor real-time temperature, the intelligent control system is used for receiving the measured real-time temperature and comparing the measured real-time temperature with the phase change temperature, and when the real-time temperature is larger than the phase change temperature, the intelligent control system controls the refrigeration device to be started. According to the intelligent refrigeration system, the phase change temperature of the phase change structure serves as the control temperature, the refrigeration system can be started to conduct mild cooling and enable the phase change structure to release heat when the electricity price is low, and the phase change structure absorbs heat to slowly rise the temperature after the refrigeration system is closed when the electricity price is high.

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 present invention discloses a temperature control device and control method based on PCM to isolate internal temperature fluctuations. The bottom of the temperature control device is in contact with the controlled object, and the PCM phase change medium absorbs heat to control the temperature. A cooling medium is introduced into the microchannels surrounded by the PCM phase change medium on all sides. The PCM is maintained at the phase change temperature through a collaborative control algorithm. The isothermal heat absorption characteristics of the phase change latent heat are utilized to suppress pulse thermal fluctuations and isolate the interference of the low-temperature cooling medium on the environment. High-precision temperature-controlled water with the same temperature as the external environment is introduced into the outer microchannel to maintain the temperature of the upper surface of the device and to collaboratively maintain the phase change state of the PCM. The present invention achieves efficient temperature control while suppressing the pulse thermal fluctuations of the heating object and the thermal interference of the cooling medium on the environment, which is beneficial to the uniformity and stability of the internal ambient temperature of the lithography equipment.

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.