197results about How to "Large latent heat of phase change" patented technology

The invention relates to a phase-transition composite material which comprises: A) 30-65% of phase-transition materials which are low melting point paraffin with a melting point of 25-45 DEG C and / or dodecanol; B) 25-45% of carrier materials which are high density polyethylane and / or ethane-vinylacetate copolymer; C) 5-15% of inorganic fillers which are porous substances and are selected from one or two of expanded perlite and expandable graphite; D) 1-10% of heat-conduction reinforcing agents; and E) 1-10% of fire retardants. The composite material has an appropriate phase transition temperature which matches the building ambient temperature, has great phase transition latent heat, excellent heat-preservation and heat-insulation performance, is fireproof and flame-retardant, is easy to process, and has greatly reduced phase-transition material leakage. The invention also relates to a method for preparing the phase-transition composite material, which comprises the thermal insulation mortar of the phase-transition composite material and a method of heat preservation of a wall by using the mortar.

The invention relates to a setting phase change energy storage material with high-thermal conductivity and a preparation method thereof, belonging to the field of phase change heat storage materials. The setting phase change energy storage material with high-thermal conductivity is characterized by containing 65-90 percent by mass of paraffin substances as a phase-change material, 9-34 percent by mass of high-density polyethylene as a support material and 1-7 percent by mass of expanded graphite as a heat conduction intensifier; a method for adding a proper amount of expanded graphite to paraffin / high-density polyethylene in a molten state is adopted to enable the heat conductivity of the setting phase change material to be increased to 1.35W / (m.K) or higher. The method comprises the following steps of: heating to melt the paraffin substances with the mass percent of 65-90 percent, and heating to enable the temperature of the liquid paraffin to reach 120-190 DEG C; adding high-density polyethylene with the mass percent of 9-34 percent and the expanded graphite with the mass percent of 1-7 percent to the liquid paraffin, and then melting and evenly stirring in vacuum; putting the mixture in a hot mould for pressing and molding; taking the mixture from the mould after naturally cooling. The setting phase change material has high thermal conductivity, does not need to be packaged in containers and can directly contact heat-transfer media.

Belonging to the technical field of heat storage and transfer, the invention provides a ternary nitric acid nano-molten salt heat transfer and storage medium, a preparation method and application thereof. The ternary nitric acid nano-molten salt heat transfer and storage medium contains a ternary nitric acid molten salt system formed by potassium nitrate, sodium nitrate and sodium nitrite. The ternary nitric acid nano-molten salt heat transfer and storage medium is characterized in that it also includes metal oxide nanoparticles and / or non-metal oxide nanoparticles. The nanoparticles are dispersed into the ternary nitric acid molten salt system to undergo compounding so as to form the ternary nitric acid nano-molten salt heat transfer and storage medium. The ternary nitric acid nano-molten salt involved in the invention has a low melting point, an upper limit use temperature up to 600DEG C, good thermal stability, and high heat conductivity, thus being very suitable for the heat storage and transfer system of industrial energy storage and solar-thermal power generation.

The invention provides a molten nano-carbonate heat transfer and accumulation medium, and a preparation method and an application thereof, and belongs to the technical field of heat storage and transmission. The molten nano-carbonate heat transfer and accumulation medium contains a molten carbonate system formed by potassium carbonate, sodium carbonate, lithium carbonate and sodium chloride, nanoparticles are added into the molten carbonate system, and the nanoparticles are metal oxide and / or nonmetal oxide; and the nanoparticles are dispersed into the molten carbonate system, and the molten nano-carbonate heat transfer and accumulation medium is formed through compounding. The melting point of molten nano-carbonate is low, so the molten nano-carbonate heat transfer and accumulation medium has an upper limit use temperature of 800DEG C, has a good heat stability and a high heat conductivity, and is very suitable for the heat accumulation and transfer systems of industrial energy accumulation and solar photo-thermal power generation.

The invention relates to a solenoid-drive liquid metallic rheostat which is characterized by comprising a casing, paraffin, a copper wire, a communicating vessel, liquid metal and an electromagnetic pump. The casing is filled with the paraffin and the copper wire; the communicating vessel is located on one side of the casing and is connected with one end of the copper wire; the electromagnetic pump is mounted at the bottom of the communicating vessel; and the liquid metal is stored in the communicating vessel, moves up and down under the driving of the electromagnetic pump and is contacted with the copper wire at different height positions, so that the length of the copper wire placed in a circuit is hanged and the variable resistance effect is achieved. The solenoid-drive liquid metallic rheostat takes the copper wire as the main body, utilizes the electromagnetic pump to drive the liquid metal to move to adjust the copper wire resistance, and adopts the paraffin to absorb joule heat, so that the whole system is stable and reliable, small in size, light in weight and low in cost, and can be widely applied to the field of soft starting of motors.

The invention discloses a heat-transfer heat-accumulation medium prepared by combining quartz sand and a ternary molten nitrate salt and a preparation method thereof, and belongs to the field of solar energy photo-thermal electricity generation. The heat-transfer heat-accumulation medium is composed of a ternary molten nitrate salt system and quartz sand. The invention also provides a preparation method of the heat-transfer heat-accumulation medium. The heat-transfer heat-accumulation medium basically does not change the freezing point of the ternary molten nitrate salt, also the upper limit operating temperature of the ternary molten nitrate salt is improved and is up to 750 DEG C. The heat-transfer heat-accumulation medium is good in thermal stability, high in thermal conductivity, low in cost and extremely suitable for solar energy thermal power electricity generation systems and solar energy photo-thermal electricity-generation heat-accumulation heat-transfer systems.

The invention provides n-tetradecyl alcohol phase-change microcapsule and a preparation method thereof. According to the invention, a melamine-formaldehyde resin is used as a wall material, n-tetradecyl alcohol is used as a core material, and an emulsification method of combined liquid crystalline phase emulsification method of microemulsion and phase inversion temperature method is utilized to prepare n-tetradecyl alcohol emulsion; prepared melamine-formaldehyde performed polymers and n-tetradecyl alcohol emulsion are utilized to prepare the n-tetradecyl alcohol phase-change microcapsule by using in situ polymerization. The n-tetradecyl alcohol phase-change microcapsule has the advantages of no residual formaldehyde, an uniform particle size, great latent heat of phase change, resistance to organic solvents and good water resistance, and is easy to blend with cement concrete and a variety of resins to form composite high-molecular phase-change materials with more excellent performance.

The invention provides a fluorine salt-based nano high temperature phase change heat storage composite material, which is characterized by compounding nano material and fluorine salt material to form uniform and stable compound. The synthetic method comprises the following steps: stirring evenly fluorine salt and placing into a vacuum electric furnace; heating to a temperature which is above the phase change temperature by 50-100 DEG C; degassing and dehydrating to lead the fluorine salt in a melting state; adding nano metal particles which account for 1%-5% of the total mass to molten salt crystals; magnetically stirring the molten material for 10-60min with the heat preservation ultrasound of 10-120min; and preparing the uniform and stable fluorine salt-based nano high temperature phase change heat storage composite material. The prepared fluorine salt-based nano high temperature phase change heat storage composite material has the advantages of rapid heat storage and heat release, high heat storage density and good heat-conducting property, can be used in various fields like space station solar energy thermo-motive power generating system, solar power generation, high temperature residue heat recycling and the like, and is in particular applicable to a heat absorber of the space solar energy thermo-motive power generating system.

The invention relates to a mining temperature reduction coolant and preparation method thereof. The invention takes macromolecular compound polyvinyl alcohol as basic raw material, cross-linking agent in certain proportion is added, wherein the cross-linking agent is 10% borax solution and the like; then freezing point temperature reduction auxiliary agent is added to prepare gel-like coolant, the prepared coolant is injected into a forming container and is frozen and formed in an icehouse the temperature of which is lower than minus 15 DEG C, and then the formed coolant is unfrozen at room temperature and is filled into a packaging bag. The mining temperature reduction coolant of the invention has the following characteristics: (1) elasticity and flexibility are good, comfortable sensation can be obtained when human body touches the coolant; (2) cold accumulation material has major latent heat of phase change and appropriate phase change temperature; (3) the coolant can be repeatedly used, can not be cataklastic, can not contract and can produce no separated water; (4) the coolant can be in close contact with human body when in use, and refrigeration effect can be fully played; (5) no toxin, odour or pollution is produced; (6) cold insulating plate and cold insulating bag of the outer packing of the coolant has the function of 'environmental protection and high efficiency cold insulation heat preservation'.

The invention relates to a high-performance moderate-temperature inorganic phase-change energy-storage material and a preparation method thereof. The material comprises the following components by weight percent: 95-99% of sodium phosphate dibasic dodecahydrate and 1-5% of sodium salt additive, wherein the sodium salt additive comprises sodium metasilicate nonahydrate, sodium salt of carboxy methyl-cellulose and sodium polyacrylate. According to the invention, as an improvement of a traditional inorganic phase-change energy-storage material, the material provided by the invention has larger phase change latent heat larger than 210 J / g and appropriate phase change temperature 30-40 DEG C, is an energy storage material with good performance within the temperature range, and has a wide application prospect.

The invention relates to a fused salt phase change heat storage device applied to a solar air conditioner. The fused salt phase change heat storage device applied to the solar air conditioner is characterized by comprising a heat storage chamber box, heat storage material accommodating pipelines, a heat storage material and heat conducting oil; a heat storage space is formed in the heat storage chamber box, the heat storage chamber box is provided with an oil inlet and an oil outlet, the oil inlet and the oil outlet are communicated with the heat storage space respectively, 2 to 200 heat storage material accommodating pipelines are arranged in the heat storage space of the heat storage chamber box, the heat storage material accommodating pipelines are fixed with the heat storage chamber box, and the heat storage material is filled in the heat storage material accommodating pipelines; and a heat transfer medium between the outer walls of the heat storage material accommodating pipelines and the inner wall of the heat storage chamber box is the heat conducting oil. The fused salt phase change heat storage device has the characteristics of simple structure, safety, reliability and high heat exchange efficiency.

The invention discloses a shell-and-tube electrical automobile battery device with an enhanced radiation function, which comprises battery single bodies, a heat exchanger shell and an interceptor plate, wherein the plurality of battery single bodies are arranged in the heat exchanger shell; each battery single body is a battery bundle formed by placing a plurality of single batteries into a heat exchanger tube and connecting the single batteries in series or parallel or both series and parallel; the heat exchanger shell is also provided with a liquid inlet pipe for allowing a phase-change material or liquid to enter the heat exchanger shell, or a foam material is filled in gaps among adjacent battery single bodies and gaps between the battery single bodies and the heat exchanger shell; the interceptor plate for controlling the flow speed of fluid is also arranged in the heat exchanger shell; and the two ends of the heat exchanger shell are provided with cover plates. The device can realize the effective cooling of an entire battery module of a power battery in a severe hot environment, keep the temperature distribution balance among the battery single bodies and the temperature in the battery in a reasonable range for reaching the optimal operation condition of power equipment, prolong the service life of the battery, and improve the power performance of the power equipment.

The invention provides a polyalcohol solid-solid phase-change composite material. The polyalcohol solid-solid phase-change composite material comprises a polyalcohol solid-solid phase-change material and a resin base material, is capable of avoiding the problems of melt flow and osmotic migration, and has wide phase-change temperature range, big phase-change latent heat, and adjustable phase-change temperature and phase-change latent heat. The invention further provides a method for preparing the polyalcohol solid-solid phase-change composite material. The method can be used for preparing the polyalcohol solid-solid phase-change composite materials with all profiles and good constancy and in all sizes. The preparation technology is simple and free from environment pollution. The polyalcohol solid-solid phase-change composite material of the invention has wide application value in the fields, such as the heat protection of aircrafts, the constant-temperature temperature control of precise instruments, meters and electronic devices, heat barrier coating, solar utilization, recovery of industrial residual heat and waste heat, the energy source of electric peak load shifting and valley filling, material, aerospace, textile, electric power, medical instrument, building and the like.

An efficient heat-accumulated hydrogen accumulator for Mg-base hydrogen-bearing material is a cylindrical body, which is composed of external and internal shells and vacuum layer between them, insulating layer on the inner surface of internal shell, heat accumulating tubes in the insulating layer, heat transfer tube at inside of the most external heat accumulating layer, hydrogen distributing and filtering tube passing through hdyrogen filter layer and installed at central position of internal shell, and hydrogen filter layer installed on supporting plate on the internal shell. It features that the heat generated by absorbing hydrogen is accumulated for supplying it when hydrogen is released.

Provided is a degradable gel cool storage agent. Components of the cool storage agent comprise starch acrylic acid graft copolymer and a phase transition cool storage material. The starch acrylic acid graft copolymer serves as a base material of the cool storage agent, and the phase transition cool storage material is absorbed in the starch acrylic acid graft copolymer so as to prepare the transparent gel cool storage agent. Adjustable phase transition temperature of the cool storage agent ranges from -4 to 0 DEG C. The phase transition cool storage material is water or NaCl water solution with concentration ranging from 0.5 to 5%. The invention further provides a preparation method of the cool storage agent. The cool storage agent is non-toxic, free of smell, non-corrosive, gel-shaped, hard to flow out to contaminate packaged products and capable of being biologically degradable.

The invention discloses a cigarette tow with a phase change heat absorption function. The tow is obtained as follows: microcapsules containing a phase change agent are added to a food fiber-grade polylactic acid material in a melt spinning process, and drying, melting, spinning, cooling, oiling, drafting, crimping and drying setting processes are performed. During smoking of a cigarette with a filter tip processed from fiber prepared with the preparation method, polylactic aid hollow fiber has high adsorption / absorption capacity for polar and non-polar smoke component gases; meanwhile, the temperature of smoke passing through the filter tip is increased, the polylactic acid material and the phase change material in the microcapsules absorb heat during phase state conversion, the smoke temperature is decreased, a harm reduction effect is realized, the prepared cigarette with the polylactic acid filter tip has unique smell absorption style, and harmful substances in smoke can be effectively filtered out.

The invention relates to a daily used vacuum cup, in particular to a compound-phase variable-speed cooling constant-temperature cup. The solid-liquid compound-phase variable-speed cooling constant-temperature cup comprises a cup lid and a cup body, wherein the cup lid is in sealed connection with the cup body, the cup body comprises an inner cup wall, a middle cup wall and an outer cup wall, the internal cavity of the inner cup wall forms a beverage containing cavity, the airtight cavity between the inner cup wall and the middle cup wall is filled with inorganic hydrous salt compound phase change liquid, the airtight cavity between the bottom of the inner cup wall and the bottom of the middle cup wall is designed into a phase change alloy rapid-cooling interlayer, and the phase change alloy rapid-cooling interlayer is provided with built-in low-melting-point phase change alloy. In a solid-liquid compound-phase variable-speed cooling microwave heating constant-temperature cup, the airtight cavity between the inner cup wall and the middle cup wall is filled with inorganic hydrous salt compound phase change liquid to form a phase change liquid heating cavity, one or more distributed rod-like microwave antennae are arranged in the phase change liquid heating cavity, and a solid-state microwave power source, a power supply part and a control system are arranged in a cup base.

The invention belongs to the technical field of heat storage materials and particularly discloses a high-temperature phase-changing composite heat storage ceramic matrix material and a preparation method thereof. The material is prepared from raw materials in parts by weight as follows: 10-15 parts of a ceramic matrix, 20-30 parts of lithium carbonate, 20-30 parts of potassium carbonate, 30-40 parts of sodium carbonate, 1-2 parts of high-thermal-conductivity carbon fiber and 1-2 parts of doped graphite. The prepared high-temperature phase-changing composite heat storage ceramic matrix materialhas the advantages of large phase change latent heat, high high-temperature stability, low toxicity, small corrosion and the like and can be used as a phase-changing heat storage material, and the energy conversion efficiency is improved; the thermal conduction performance is higher, and the heat absorption and release speed is higher; the appearance of the material cannot be changed during phasechanging, and leakage can be effectively prevented.

The invention discloses a sodium silicate-molten binary nitrate compounded heat-transfer heat-storage medium and its preparation method and use. The sodium silicate-molten binary nitrate compounded heat-transfer heat-storage medium is prepared by compounding a molten binary nitrate system and sodium silicate. The molten binary nitrate system mainly comprises potassium nitrate and sodium nitrate. The sodium silicate-molten binary nitrate compounded heat-transfer heat-storage medium has heat-transfer performances of the nitric acid molten salt, improves a safe work temperature upper limit of the system to 650 DEG C, and has a wide use temperature range and good thermal conductivity. The sodium silicate-molten binary nitrate compounded heat-transfer heat-storage medium has good heat absorption and heat-storage capability, solves the problem that the molten binary nitrate has poor thermal conductivity and easily produces local overheating, and can be widely used in the technical field of solar photo-thermal power generating.

The invention specifically relates to a polyvinyl alcohol porous material and a preparation method thereof, belonging to the technical field of high polymer materials. The polyvinyl alcohol porous material provided by the invention has a pore diameter of 5 to 300 [mu]m, an opening percent of 10 to 50%, a cell density of 10<5> to 10<10> cells / cm<3>, a dry compression modulus of 4.0 to 7.5 MPa, water-absorbing capacity of 5 to 20 times and latent heat of phase change after water absorption equilibrium of 250 to 320 J / g. The polyvinyl alcohol porous material may be prepared from 40 to 84 parts of polyvinyl alcohol, 15 to 45 parts of a water-containing foaming agent, 0.5 to 5 parts of an inorganic metal salt and 0.5 to 10 parts of a cell adjusting agent by using a thermoplastic processing method. The shape of the prepared polyvinyl alcohol porous material may be diversified. The polyvinyl alcohol porous material provided by the invention has the characteristics of plasticity, no need for special packaging and repeated usability, and water adsorbed by the polyvinyl alcohol porous material does not flow when undergoing phase change after freezing; so the polyvinyl alcohol porous material is extensively applicable as a low-temperature refrigeration material for cold-chain transportation.

The invention discloses an LNG cold energy utilization new method, the method mainly comprises the following steps: step 1. Reliquefaction: the reliquefaction of flash LNG steam is carried out by a reliquefaction device; step 2. Energy storage: the heat exchange of LNG and energy storage materials in an LNG liquid storage device is carried out, and the released cold energy is stored in a cold storage device; step 3. Energy release: the energy storage materials are dissolved for releasing the cold energy which is further transferred to a tail-end cold energy utilizing device; step 4. Optimization: a part of the LNG can be directly gasified to produce the cold energy which is supplied to the tail-end cold energy utilizing device. The LNG cold energy utilization new method of the invention has simple structure of the needed system, convenient operation, high utilization ratio to LNG cold energy and high economic benefits.

The invention discloses low-temperature composite phase change cold storage agent and a preparation method thereof. The low-temperature composite phase change cold storage agent is composed of 15-16.5% of sodium chloride, 12.5% of glycerol and rest of water by weight. The preparation method for the low-temperature composite phase change cold storage agent includes steps that S1, preparing 20-22% of sodium chloride solution according to the mass percent; S2, preparing 50% of glycerol according to the mass percent; S3, pouring the solution of the S1 and the solution of the S2 into a vessel according to the ratio of 3: 1 to mix, and using a magnetic stirrer to stir uniformly. The low-temperature composite phase change cold storage agent is low in phase change temperature, large in phase change latent heat, easy to prepare, low in cost, low in use concentration, small in volume change in the phase change process, safe to use, non-toxic, odorless, pollution free, and small in corrosivity.

The invention discloses a preparation method of a phase change material. The preparation method is that dodecanol serving as a main phase change agent and paraffin serving as a secondary phase change agent are adopted for preparing a low-temperature phase change material. The low-temperature phase change material has phase change temperature about 22 DEG C, is relatively high in phase change enthalpy value which is about 180J / g, has stable performance, excellent phase change reversibility and little change in size during the phase change, and is safe, nontoxic and non-corrosive.

The invention discloses a method for manufacturing phase-change heat absorption swelling fire-retardant wood and the swelling fire-retardant wood. The manufacturing method includes the following steps that the wood is processed and manufactured according to the dimensions required, so that a solid wood component is obtained; the solid wood component is subjected to degreasing and duct dredging pretreatment, and accordingly the pretreated solid wood component can be obtained; the pretreated solid wood component is put into phase-change heat absorption swelling fire-retardant steeping liquor for conducting vacuum pressure impregnation treatment, and then drying is performed, so that the solid wood component filled with a phase-change heat absorption swelling fire-retardant material is obtained; the solid wood component filled with the phase-change heat absorption swelling fire-retardant material is subjected to sanding shaping and surface closing protective treatment, and accordingly the phase-change heat absorption swelling fire-retardant wood is obtained. The swelling fire-retardant wood obtained through the manufacturing method achieves phase-change heat absorption in the heating process of the wood and forms a swelling foam carbon layer under the fire condition, the change of fires can be lowered and fire losses are reduced.

The invention provides decalescence intumescent flame-retardant fireproof waterborne coating. The decalescence intumescent flame-retardant fireproof waterborne coating is prepared from the following components in parts by weight: 35 to 75 parts of polyethylene glycol phase-change self-crosslinked acrylate film forming emulsion, 5 to 25 parts of galactose intumescent flame-retardant system, 5 to 35 parts of expandable filler, 2 to 4 parts of wetting agent, 1 to 3 parts of thickening agent and 5 to 15 parts of water. The coating can inhibit flame at medium and low temperature by decalescence and realizes heat-insulating protection of an internal material by a high-temperature expandable charcoal layer; the decalescence intumescent flame-retardant fireproof waterborne coating has high phase change heat absorption amount and remarkable cooling fireproof effect. The invention also discloses a preparation method of the coating. The preparation method comprises the following steps: putting water into a stirrer; sequentially adding the thickening agent and the wetting agent in a stirring process, and uniformly mixing; adding the galactose intumescent flame-retardant system and the expandable filler, and mixing and dispersing to be uniform; then adding the polyethylene glycol phase-change self-crosslinked acrylate film forming emulsion in the stirring process, adjusting a pH value of the system, shearing, dispersing, sieving and discharging. The method is simple in process and low in cost.

The invention provides a biomorphic silicon carbide ceramic high-temperature photo-thermal storage material and a preparation method thereof. The heat storage material is prepared by compounding a biomorphic silicon carbide ceramic framework and chlorate. The biomorphic silicon carbide ceramic is a ceramic material generated by high-temperature reaction of molten silicon and a charcoal porous precursor, and silicon carbide ceramic frameworks with different porosities can be obtained by different wood precursors. The phase-change heat storage material is prepared by fully and uniformly mixing sodium chloride and potassium chloride in a ball mill and drying to obtain the sodium-potassium chloride eutectic salt. The biomorphic silicon carbide ceramic framework is coated with the phase changeheat storage material by adopting a vacuum impregnation method, so that pores of the ceramic framework are filled with the phase change material, thereby obtaining the biomorphic silicon carbide ceramic high-temperature photo-thermal storage material. The composite material prepared by the invention has the excellent characteristics of high thermal conductivity (116 W / mK), high spectral absorptionperformance (92%) and high heat storage density (453 kg / kJ), and is expected to promote the development of constructing a clean, low-carbon, efficient and safe energy system.

The invention relates to the field of application of electronic functional materials, and particularly discloses a preparation method of a heat-conducting wave-absorbing phase-change composite material, and the composite material. The preparation method of the heat-conducting wave-absorbing phase-change composite material comprises the following steps: S1, premixing: adding thermoplastic resin with a first melting point into a premixing container provided with a heating device, and sequentially adding thermoplastic resin with a second melting point and a phase-change microcapsule after melting; S2, filler mixing: adding a wave-absorbing filler, a heat-conducting filler and an auxiliary agent into a phase-change premixed base material obtained in the step S1, and conducting uniform stirringand dispersing to obtain a semi-finished product; and S3, calendering: calendering the semi-finished product at a calendering temperature to a required thickness, and conducting cooling to obtain theheat-conducting wave-absorbing phase-change composite material. Due to the fact that the calendering temperature corresponds to the first melting point of the thermoplastic resin with the first melting point, and the second melting point of the thermoplastic resin with the second melting point is lower than the first melting point of the thermoplastic resin with the first melting point by 20 DEGC or more and lower than the calendering temperature by 10 DEG C or more, so the effect of avoiding cracking of the shell structure of the phase-change microcapsule during calendering is achieved.

The invention relates to a phase-change microcapsule for inhibiting a pavement from being iced and a preparation method, and belongs to the field of functional materials. The phase-change microcapsulecomprises a wall material and a core material, wherein the wall material is made from a melamine modified urea-formaldehyde resin prepolymer; the melamine modified urea-formaldehyde resin prepolymeris prepared from melamine, urea and formaldehyde according to a molar ratio of (3 to 5) to (1 to 3) to (5 to 7); the mass ratio of the wall material to the core material is (0.5 to 0.8) to 1. The phase-change microcapsule can be used for effectively controlling the low-temperature distress of an asphalt pavement, and has the advantages of being high in phase-change latent heat, simple to prepare and reversible in phase-change process, free from toxicity and corrosivity and being capable of effectively inhibiting the pavement from being iced and frosted, and the like, is used for improving theadaptive capacity, to the change of an ambient temperature, of the asphalt pavement, and is used for providing help for containing a temperature shrinkage crack and prolonging the service life of an existing pavement.

The invention provides a low-temperature phase-change heat storage material and a preparation method thereof. The low-temperature phase-change heat storage material comprises the following components in percentage by weight: 90%-92% of sodium acetate trihydrate, 3%-5% of tetrasodium pyrophosphate decahydrate, 2%-3% of anhydrous sodium carbonate and 1%-2% of polyacrylamide. The preparation method comprises the following steps of: grinding the four components until the granularity is 30-50 meshes respectively, mixing uniformly, and heating the mixture in a water bath at the temperature of 74-79 DEG C, so as to completely melt all the components to form a colloidal liquid; after stirring uniformly, injecting the colloidal liquid into a container, wherein the injected volume is 88%-90% of the volume of the container; and after the colloidal liquid is cooled to room temperature, sealing the container. According to the invention, the adding ratio of an additive is low, the stability of the material is high, the phase-change latent heat is large, the crystallization temperature is moderate, and the supercooling degree is not more than 2 DEG C; and the phase-change heat storage material is the colloidal liquid in melting, so that the phase separation phenomenon is avoided, the preparation process is simple, the packaging is easy and the production is convenient.

The invention provides a low-temperature phase-change heat accumulator which comprises a tank body and a snakelike metal pipe row. The snakelike metal pipe row is arranged in the tank body, metal fins are arranged on the snakelike metal pipe row in a sleeved mode at intervals, the snakelike metal pipe row comprises heat accumulation pipe row bodies and heat releasing pipe row bodies, the heat accumulation pipe row bodies and the heat releasing pipe row bodies are alternatively arranged, the heat accumulation pipe row bodies are connected with a heat accumulation refrigerant loop of a heat accumulation evaporation type air source heat pump through liquid inlet pipes and liquid outlet pipes of the heat accumulation pipe row bodies, the heat releasing pipe row bodies are connected with a heat releasing refrigerant loop of the heat accumulation evaporation type air source heat pump through liquid inlet pipes and liquid outlet pipes of the heat releasing pipe row bodies, the positions between the heat accumulation pipe row bodies and the liquid inlet pipes of the heat releasing pipe row bodies and between the heat accumulation pipe row bodies and the liquid outlet pipes of the heat releasing pipe row bodies are respectively provided with a heat accumulation header, the positions between the heat releasing pipe row bodies and the liquid inlet pipes of the heat releasing pipe row bodies and between the heat releasing pipe row bodies and the liquid outlet pipes of the heat releasing pipe row bodies are respectively provided with a heat releasing header, heat preservation materials are arranged in an interlayer of the tank body, and the interior of the tank body is filled with composite phase-change heat accumulation materials. The low-temperature phase-change heat accumulator is mainly used in an air source heat pump unit technological process, can serve as a heat accumulator or a subcooler or an auxiliary evaporator, and can carry out heat accumulation and heat releasing at the same time. The heat supply coefficients of a heat pump unit can be improved, and the operation performance of the air source heat pump unit in a low-temperature environment is remarkably improved.