116results about How to "Good heat transfer performance" patented technology

The invention relates to a nano solid-liquid phase change energy storage composite material, belonging to a phase change energy storage technology. The composite material comprises the following components in parts by weight: 88 to 98 parts of hydrated salt, 1 to 7 parts of a nano material and 1 to 5 parts of thickener. With regard to the nano solid-liquid phase change energy storage composite material, the hydrated salt is taken as a main body for phase change energy storage, thus having higher energy storage density and good heat transfer performance; the nano material is taken as nucleating agent, thereby reducing and even eliminating the degree of supercooling of the hydrated salt and having stable property and corrosion resistance; and a proper amount of the thickener is added to increase the viscosity of liquid hydrated salt, thereby preventing the phase separation of the hydrated salt and simultaneously strengthening the suspension stability of the nano material. The nano solid-liquid phase change energy storage composite material of the invention can be widely applied to the fields of solar thermal utilization, industrial waste heat recovery, air conditioning energy storage and the like.

A vapor chamber, in which a condensable fluid, which evaporates and condenses depending on a state of input and radiation of a heat, is encapsulated in a hollow and flat sealed receptacle as a liquid phase working fluid; and in which the wick for creating the capillary pressure by moistening by the working fluid is arranged in said sealed receptacle, comprising: a wick for creating a great capillary pressure by being moistened by said working fluid, which is arranged on the evaporating part side where the heat is input from outside; and a wick having a small flow resistance against the moistening working fluid, which is arranged on the condensing part side where the heat is radiated to outside.

An electrical heater includes plural heating body plates (31) arranged in parallel with each other to define an air passage (32) between adjacent two thereof, a positive electrode member (33) joined to one end side of each heating body plate, and a negative electrode member (34) joined to the other end side of each heating body plate. In the electrical heater, the heating body plates are arranged to directly heat air passing through the air passage when electrical power is supplied to the heating body plates through the electrode members. Accordingly, the electrical heater can effectively heat air with a simple structure.

The invention relates to a loop gravity-assisted heat pipe heat transfer device which mainly comprises an evaporator, a condenser, a steam pipe and a liquid pipe, wherein the evaporator is pipe-shaped, the evaporator is sealed and is filled with a working medium, an inlet of the steam pipe slightly extends into the top of the evaporator, and an outlet of the liquid pipe passes through the top of the evaporator and extends to the bottom of the evaporator; and an outlet of the steam pipe is communicated with the upper part of the condenser, and an inlet of the liquid pipe is communicated with the lower part of the condenser. The loop gravity-assisted heat pipe heat transfer device disclosed by the invention has excellent heat transfer performance and application expandability, can avoid installation difficulty, meets heat transfer requirements of vacuum tube heat collectors with any sizes and has the advantages of reliable structure and manufacturing process and lower cost.

A flooded evaporator is provided which can remove floating mist more exactly resulting in that the refrigerant mist is prevented from being sucked into the compressor, and with which heat transfer between the medium to be cooled and refrigerant liquid is improved. The evaporator is composed such that; a tubular housing (3) is provided to erect from a horizontal cylindrical container (1) which forms a heat exchanging section with a heat exchanger (2) accommodated therein, an inner tube (12) for upwardly guiding refrigerant vapor generated in the heat exchanging section is provided, the inner tube (2) is covered by a loose cover (13) so that refrigerant vapor containing refrigerant mist flowed up in the inner tube (12) impinges against the loose cover (13) to be deflected downward to flow out from the inner tube (12), a space (17) is secured in the tubular housing (3) to allow refrigerant mist to fall down utilizing gravitational attraction, a demister (16) is provided in the tubular housing (3) above the space (17), the clearance area between the inner tube (12) and loose cover (13) is smaller than the clearance area between the outer periphery of the loose cover (13) and inner periphery of the tubular housing (3), and circulation paths (20) of refrigerant liquid are formed in the container (1).

The invention discloses a manufacturing method of a panel-type heat pipe, comprising the following steps: providing a mould which is provided with a first cavity and a plurality of second cavities communicated with the first cavity; providing first metal powder, second metal powder and binder mixed with the metal powder; providing a plurality of deorienting fillers arranged at interval, causing the fillers to be arranged in the first cavity and the second cavities and to be arranged at interval with each inner wall surface of the first cavity and the second cavities; injecting the first metalpowder and the second metal powder into the first cavity and the second cavities of the moulds in order; removing the deorienting fillers so as to form a flake; sintering the flake at high temperature; causing the first metal powder to form the continuous outer cavity of the panel-type heat pipe; causing the second metal powder to form continuous capillary structure formed on the inner surface ofthe outer cavity and a plurality of porous shores; then forming a brown embryo; vacuumizing the brown embryo, injecting operating fluid, and processing a seal to obtain the panel-type heat pipe.

The invention discloses graphene-containing heat-dissipating coating and a preparation method. The graphene-containing heat-dissipating coating comprises the following components in percent by weight:35-55% of resin, 1-15% of graphene, 5-10% of a functional filler, 0.5-1.5% of a leveling agent, 0.05-0.2% of a defoaming agent, 1-3% of a dispersing agent, 3-10% of a coloring agent and 10-40% of a solvent. High-heat dissipation and high-radiation N-type high-purity graphene, high-radiation dielectric loss functional graphene and the functional filler are combined according to a specific mass ratio so as to promote formation of a non-gravity stacking bridging structure through graphene radiation and a filler structure; defects in the internal space of coating are increased, so that the coating is endowed with higher heat transfer performance; the area of spatial infrared radiation is increased, so that the radiation emissivity and the radiation absorptivity achieve the optimal radiation effect, the infrared heat radiation is enhanced, the coating with high radiation and high heat transfer performance is formed, and thus the heat uniformizing effect of a substrate facing the coating isachieved.

The invention discloses a radiator of a liquid cooling heat radiation device, which is hot connection with a heat source of electronic equipment and is used by working fluid. The invention includes a shell unit and a plurality of interference elements. The shell unit is made of heat conducting material and forms a containing space. The shell unit has two water openings communicated with the containing space for working fluid in and out. The interference elements is equipped in a flow passage and the working fluid in flowing with the mode of full blending, constant flowing direction change, continuous boundary layer development and damage can improve heat transfer effect and heat radiation performance of the radiator.

A heat exchanger structure comprises a body. A first flow channel group and a second flow channel group are arranged on two sides of the body correspondingly and are in spiral shapes. A plurality of turbulent flow portions are arranged on one sides of the first flow channel group and the second flow channel group corresponding to the body. The body is further provided with a water inlet and a water outlet which are communicated with the first flow channel group and the second flow channel group. Fluid flows in the first flow channel group and the second flow channel group. The fluid can produce separation eddy through the turbulent flow portions so as to greatly improve turbulence intensity of a flow field to improve heat transfer efficiency.

The invention relates to a mixed working medium cascade power generation and remaining cooling capacity output system and method utilizing liquefied natural gas (LNG) cold energy. The system comprises an LNG vaporizing side, a primary ternary mixing working medium Rankine cycle, a secondary ternary mixing working medium Rankine cycle and a third-level two-element mixing working medium Rankine cycle. The secondary ternary mixing working medium Rankine cycle is embedded in the primary ternary mixing working medium Rankine cycle, and the third-level two-element mixing working medium Rankine cycle is independent from the primary ternary mixing working medium Rankine cycle and the secondary ternary mixing working medium Rankine cycle. Compared with the prior art, the system has the beneficial effects that the whole LNG cold energy utilizing system structure is not too complex, meanwhile, organic mixing working media are adopted, the available energy loss existing in the heat exchanging process of all links is reduced as much as possible, a refrigerant heat exchanging link is introduced into the system, the cold capacity loss problem caused by the fact that the working media and LNG directly exchange heat with a hot source is relieved, and the cooling capacity acquired from the system by refrigerant can be used for other cold capacity demand approaches.

The invention relates to the technical field of heat exchangers, in particular to a high-efficient all aluminum alloy heat exchanger which comprises a housing, and a main fluid inlet pipe, a main fluid outlet pipe, a heat exchanging medium inlet pipe and a heat exchanging medium outlet pipe, which are connected externally with the housing. At least one all aluminum alloy heat exchanging sheet which is formed by the extrusion process is arranged in the housing; each heat exchanging sheet is provided with a heat exchanging fin and a nick; the middle of each heat exchanging sheet is provided with a seamless millipore passage in the length direction; the seamless millipore passage and the main fluid inlet pipe are communicated with the main fluid outlet pipe so as to form a main fluid passage; and clearances between the nicks of the heat exchanging sheets and the heat exchanging fins, clearances between adjacent heat exchanging sheets, the heat exchanging medium inlet pipe and the heat exchanging medium outlet pipe together form a heat exchanging medium passage. The invention has the advantages of good heat transfer performance, high voltage resistance, low temperature resistance, low cost and stable operation, can be used in oil refining engineering, chemical engineering, low temperature engineering, liquefaction of natural gas, liquid vaporization, gas separation and other industrial fields, and can be used for super-low temperature gas liquefaction or liquid vaporization.

A heat pipe having enhanced heat transport capacity that can be manufactured easily is provided. The heat pipe 1 comprises a sealed container 2 and a wick structure 10. The wick structure includes a first wick 11 formed of copper fibers 11a, and a second wick formed of carbon fibers 12a. The first wick 11 is sintered to be fixed to an inner face 21a of a flat wall 21 while holding the second wick 12 therein.

The invention discloses a nanofluid seawater desalination system using air as a heat transfer medium; air enters vortex pipes through an air compressor and an air diverter; hot end outlets of the vortex pipes are connected with a first effect seawater distiller; cold air enters a second condenser; seawater and nanoparticles are mixed in a seawater pool, and then the mixture enters a nanofluid diverter and is divided into a first condenser, a second preheater and a third preheater. Nanofluid outlets of all the preheaters are connected with a nanofluid inlet of the first effect seawater distiller. Hot air coming out of the first effect seawater distiller is used as a heat source of the third preheater; water steam of a former effect seawater distiller is used as a heat source of a next effect seawater distiller; a thick nanofluid of the former effect seawater distiller flows to the next effect seawater distiller; a thick nanofluid and water steam coming out of the final effect seawater distiller are respectively used as a heat source of the second preheater and a heat source of a first preheater; water steam and fresh water are condensed through the first condenser and the second condenser; and high efficiency and energy saving are achieved.

The invention relates to a hydrogen generator and application thereof. The hydrogen generator is formed by a first medium comprising a recombination zone, an oxidation zone and a preheating zone, wherein the recombination zone is used for accommodating a recombination accelerant so as to carry out the steam recombination reaction of a hydrogen-producing raw material to generate hydrogen; the oxidation zone is used for carrying out heat release oxidation reaction so as to provide a heat source, and a first oxidation accelerant exists in the oxidation zone; the heat source provided by the oxidation zone supplies heat energy to the preheating zone and the recombination zone so as to firstly preheat the hydrogen-producing raw material in the preheating zone and subsequently carry out the steam recombination reaction in the recombination zone; first media exist among the recombination zone, the oxidation zone and the preheating zone at the intervals of the shortest distance of at least 0.5mm; and the coefficient (K) of heat conduction of the first media is at least 60W / m-K. The carbon monoxide content of a hydrogen-contained gas mixture prepared by the hydrogen generator is quite low, therefore, the gas mixture can be directly applied to common fuel.

The invention discloses a preparation method of a diamond / W-Cu composite. The preparation method of the diamond / W-Cu composite comprises the steps that W is plated on surfaces of diamond particles through a salt bath plating method first, Cu-clad W composite powder is obtained through a chemical plating method, a certain quantity of W-plated diamond particles and a certain quantity of Cu-clad W composite powder are mixed and press-molded, and an obtained blank is placed in a tube furnace so as to be sintered under the protection of H2, so that the diamond / W-Cu composite is obtained. Accordingto the preparation method of the diamond / W-Cu composite, W-plated diamond is added into the W-Cu composite, so that the heat transmission performance of the W-Cu composite is improved by means of theheat conductivity of the diamond; and meanwhile, W powder is plated with Cu through the chemical plating method so that Cu can be evenly distributed on the surface of the W powder, nonuniform mixing of the W powder and Cu powder is avoided, the compactness of the composite is improved, and the comprehensive performance of the composite is improved.

A household appliance includes a drying chamber, a process air loop and a heat pump. The heat pump includes a heat transfer loop containing a heat transfer fluid, an evaporator heat exchanger, a liquefier heat exchanger, a compressor, and a nozzle. The heat transfer fluid has a critical temperature above 60° C., a nominal heat of vaporization at boiling point of at least 220 kJ / kg, a GWP index of less than 150 and a lower flammability level of at least 0.1 kg / m3. Preferably, the household appliance is a dryer for drying wet laundry.

The invention provides a heat exchanger and a method for manufacturing the heat exchanger. The heat exchanger comprises heat exchange tubes, fins and welding materials, wherein each fin comprises a fin body, fin holes which are formed in the fin body and used for containing the heat exchange tubes and fin hole turned edges which extend from the edges of the fin holes to one side of the fin body; the welding materials are used for welding the fin hole turned edges of the fin bodies and the heat exchange tubes. According to the technical scheme of the heat exchanger, the problem that production cannot be conducted due to the fact that a current heat exchanger with a small tube diameter cannot expand can be solved; meanwhile, the welding technology is adopted for the fins and the heat exchange tubes, so that the heat exchanger has excellent heat transfer performance.

The invention discloses a high-temperature-uniformity heat radiator for a navigation satellite and belongs to the technical field of spacecraft heat control. A temperature radiator comprises a honeycomb plate, more than two U-shaped heat tubes, heaters and peripheral equipment, wherein the peripheral equipment is a rubidium clock; the straight tube section of each U-shaped heat tube consists of a tube body and a fin; the cross section of each U-shaped heat tube is T-shaped; the U-shaped section of each U-shaped heat tube only comprises the tube body of the corresponding straight tube section; the U-shaped heat tubes are embedded into the honeycomb plate; the upper surfaces of the fins and the lower surfaces of the tube bodies are respectively attached to the upper and lower inner surfaces of the honeycomb plate; the U-shaped heat tubes are nested with each other, so that the straight tube sections of the U-shaped heat tubes in the honeycomb plate are adjacently arranged; the surface of the honeycomb plate corresponding to the adjacent arrangement area of the straight tube sections serves as an installation area of the rubidium clock; the heaters are uniformly arranged on the tube bodies of the straight tube sections of the U-shaped heat tubes and are used for providing compensation heating amount for the heat radiator. The efficient heat transfer, heat dissipation and heat balance of the temperature radiator can be realized, and requirements on the environment temperature control accuracy of the rubidium atomic clock are met.

The invention provides an inverter cooling liquid. The inverter cooling liquid consists of the following raw materials in percentage by weight: 0.5-3 percent of 2-hydroxyphosphonoacetic acid, 0.2-3 percent of amyl phosphate, 0.01-1 percent of 5-carboxy benzotriazole, 0.1-2.0 percent of 2,4,6-tri-(aminocaproic acid)-1,3,5-triazine, 0.5-1.0 percent of inorganic base, 0.001-0.1 percent of antifoaming agent, 30-60 percent of water and the balance of glycol. The inverter cooling liquid has excellent corrosion inhibiting performance of an aluminum magnesium alloy, better heat exchange performance and compatibility among PVC, ethylene propylene diene monomer rubber and butadiene styrene rubber.

A heat pipe a flat heat pipe having enhanced heat transport capacity is provided. The flat heat pipe 1 comprises a working fluid encapsulated in a container 2, a first wick 11 that returns the working fluid from a condensing portion 4 to an evaporating portion 3 by a capillary pumping, and a second wick 12 that spreads the working fluid returned thereto over an inner face of the container by a capillary pumping. The second wick is formed only in the evaporating portion 3 to extend in a circumferential direction on the inner face of the container2.

The invention discloses a heat-exchanger, comprising: a first collecting pipe and a second collecting pipe which are hollow and parallel arranged, a plurality of dividing pipes vertical to the first collecting pipe and the second collecting pipe, an internal flowing divider in the first collecting pipe, an inlet pipe and an outlet pipe. The internal flowing divider divides the first collecting pipe into an inlet collecting chamber and an outlet collecting chamber which are separated from each other, and the inlet pipe is communicated with the inlet collecting chamber, and the outlet pipe is communicated with the outlet collecting chamber. The dividing pipes are separated into two groups, wherein, one group is communicated with the inlet collecting chamber, another group is communicated with the outlet chamber, and the adjacent dividing pipes form individual U-shaped channels which are disposed in interval in order to achieve even temperature distribution for the heat-exchanger with excellent heat-exchange performance. The invention also discloses an air-conditioner with the heat-exchanger.

The invention provides a graphene carbon nano tube composite film and a preparation method and application thereof. The preparation method comprises the following steps that S1, a substrate is provided, and the whole or at least one face of the substrate is made of a graphene catalyst; S2, electroplating is conducted, thus, a carbon nano tube is attached to the surface of the substrate, and the graphene catalyst is not fully covered with the carbon nano tube; and S3, graphene continues to grow on the face, containing the graphene catalyst, of the substrate through a chemical gas phase method,and the graphene carbon nano tube composite film is obtained. The graphene carbon nano tube composite film and the preparation method and application thereof have the characteristic of being simple intechnology, the graphene carbon nano tube composite film obtained through the non-transferring self growing technology is good in quality, and contact and attaching between the composite film and thecatalyzing substrate are good.

The invention relates to a method for preparing an elemental tellurium based composite pyroelectric material and belongs to the field of pyroelectric materials. The pyroelectric material is characterized by having a chemical formula of Te1-x(Sb2Se3)x, wherein x is not smaller than 0 and not greater than 0.2. The preparation method disclosed by the invention comprises the following steps: weighingvarious raw material ingredients according to a mole fraction proportioning ratio of the chemical formula, and encapsulating Te cakes, Sb powder and Se powder into a carbon-plated quartz tube throughvacuum encapsulation; then, smelting the quartz tube in a vertical tube type furnace; then, carrying out annealing treatment; and finally, grinding an obtained cast ingot into fine powder, then, carrying out spark plasma sintering, so as to obtain dense mass which has very low thermal conductivity and relatively high pyroelectric properties, wherein the pyroelectric Q-value reaches 0.95. Accordingto the method, the pyroelectric properties of the elemental tellurium based composite pyroelectric material are improved through a smelting process, an annealing process and a spark plasma sinteringprocess. Compared with the prior art, the method has the advantages that through introducing an antimony selenide component, the cooperated optimization of carrier concentration and lattice thermal conductivity is achieved, and the process flow is simple and controllable and is low in cost.

The invention discloses a passive terrestrial heat type snow and ice melting device which comprises a pavement heating pipe group, wherein the pavement heating pipe group is transversely buried on a shallow ground surface; horizontal headers which are parallel to the length direction of a pavement and buried pipe groups which are buried vertically and deeply are arranged on two sides of a pavementto be heated; both the pavement heating pipe group and the buried pipe groups are connected with the horizontal headers; water pumps are mounted on the horizontal headers; the pavement heating pipe group consists of a main pipe and branch pipes; the main pipe is mounted on the outer side of the pavement and is parallel to the length direction of the pavement; the main pipe comprises an outer pipeand an inner pipe which are nested together; an inorganic heat conduction medium layer is arranged between the inner pipe and the outer pipe; the branch pipes are communicated with an inner cavity between the inner pipe and the outer pipe of the main pipe; the horizontal headers are connected with the inner pipe of the main pipe of the pavement heating pipe group; heat accumulated by the horizontal headers is conducted to the inner pipe of the pavement heating pipe group and is used for heating the inorganic heat conduction medium between the inner pipe and the outer pipe; and the heat is conducted to a pavement surface from the branch pipes of the pavement heating pipe group, and thus snow and ice melting can be achieved. The invention further discloses a construction process of the device.

The invention relates to a preparation method of a high-purity chloride molten salt. The method is: providing an untreated chloride molten salt having a purity of 95% or more; heating the untreated chloride molten salt to a liquid state to obtain a molten chloride molten salt; adding an active metal into the molten chloride molten salt, standing to allow the active metal and water and oxidizing impurities in the untreated chloride molten salt to respectively perform redox reaction to generate precipitates, wherein the active metal comprise at least one of lithium, potassium, calcium, sodium, magnesium, aluminum, zinc and iron; the oxidizing impurities comprise OH<->, SO4 < 2->, SO4 < 2->, NO3 < 3-> and NO2 < 2->; filtering and removing residual solid-state active metals and precipitates inthe molten chloride molten salt so as to obtain the high-purity chloride molten salt, wherein the high-purity chloride molten salt contains the dissolved active metals. The invention also relates toapplication of the high-purity chloride molten salt. The preparation method of the high-purity chloride molten salt provided by the invention is simple, is safe and solves the problem that a structural material is easy to corrode in the molten salt and restricts the industrial large-scale application of the chloride molten salt.

The invention discloses a radiating structure which comprises a body. The body is provided with a chamber, the chamber is provided with an evaporation zone, a condensation zone, a first backflow zone and a second backflow zone, the evaporation zone is communicated with the condensation zone, the first backflow zone and the second backflow zone, a heat-insulation plating covers an intersection of the first backflow zone and the second backflow zone, and the chamber is filled with working liquid. The radiating structure has the advantages that heat leakage in a space between the evaporation zone and the condensation zone can be prevented owing to the heat-insulation plating, and accordingly vapor and liquid in the radiating structure can keep smoothly circulating.

The invention provides a heat dissipating capillary structure which is a metal capillary structure, and the metal capillary structure is a three-dimensional reticular cross-linkage structure. The heat dissipating capillary structure is the three-dimensional reticular cross-linkage structure which has the three-dimensional solid shape and complete reticular cross-linkage structure and larger gap rate and also has larger capillary force. The invention also provides a heat conducting component which uses the heat dissipating capillary structure and the method for manufacturing the heat dissipating capillary structure. The heat conducting component has good performance of heat conduction, and the method for manufacturing the heat dissipating capillary structure is simple.