1107results about How to "Increase heat transfer area" patented technology

The invention relates to systems and methods for rapidly and isothermally expanding gas in a cylinder. The cylinder is used in a staged hydraulic-pneumatic energy conversion system and includes a gas chamber (pneumatic side) and a fluid chamber (hydraulic side) and a piston or other mechanism that separates the gas chamber and fluid chamber while allowing the transfer of force / pressure between each opposing chamber. The gas chamber of the cylinder includes ports that are coupled to a heat transfer subassembly that circulates gas from the pneumatic side and exchanges its heat with a counter flow of ambient temperature fluid from a reservoir or other source.

A device, method, and system for a fluid cooled channeled heat exchange device is disclosed. The fluid cooled channeled heat exchange device utilizes fluid circulated through a channel heat exchanger for high heat dissipation and transfer area per unit volume. The device comprises a highly thermally conductive material, preferably with less than 200 W / m-K. The preferred channel heat exchanger comprises two coupled flat plates and a plurality of fins coupled to the flat plates. At least one of the plates preferably to receive flow of a fluid in a heated state. The fluid preferably carries heat from a heat source (such as a CPU, for example). Specifically, at least one of the plates preferably comprises a plurality of condenser channels configured to receive, to condense, and to cool the fluid in the heated state. The fluid in a cooler state is preferably carried from the device to the heat source, thereby cooling the heat source.

The present invention relates to an evaporator for an air conditioner of a vehicle, and the major object of the present invention is to provide the evaporator which is capable of decreasing the whole dimension of an evaporator and enhancing a heat exchange performance. To achieve the above objects, an evaporator includes an upper and lower header units comprising a tank member, a partition member, a header plate, an intermediate baffle, a finishing baffle; and a plurality of tubes comprising a front tube portion, a rear tube portion, a connection tube portion; and a wrinkle fin.

The present invention discloses heat transfer tubes for evaporators in air conditioning and refrigeration systems, comprising: a tube body (1); outer fins (2) extending on an outer wall surface of the tube body (1) and having outer fin walls opposite to the outer fin walls of the adjacent outer fins; channels (6) located between the adjacent fins (2) so as to constitute channel chambers; fin top platforms (3) on respective tops of the outer fins (2), the fin top platforms (3) including fin top edges (3a) extending from both sides of the fin top platforms (3) so that the channel chambers take a form of a cavity structure as a whole; channel chamber openings constituted by gaps between the adjacent fin top edges (3a) of the fin top platforms (3) of the outer fins; and lateral fins (4) arranged on portions or substantially middle portions of the outer fin walls of the outer fins (2) in a height direction of the outer fins (2) and at intervals in an spreading direction of the outer fins (2), so that the cavity structure is formed into a double cavity structure. The heat transfer tube of the present application can achieve the technical effect of producing an excellent boiling heat transfer coefficient and enhancing the boiling heat transfer as well as saving material and reducing the weight of the tube body.

A combination static mixer and heat exchanger having heat exchanger tubes (1) which are provided over their circumference with fins (2a, 2b) which have a static mixing effect.

The invention discloses an efficient machine for desalting sea water. The efficient machine for desalting sea water mainly comprises a sea water desalting device and a water supply tank, wherein the sea water desalting device comprises a high-pressure water chamber, a heat exchange chamber, a pipe sheet, a transversely fluted tube, an sprayer, a heat exchange surface, a film forming device, a baffle and a plurality of heat pipes; and a sewage draining cooling pipe and a desalted water cooling pipe are arranged inside the water supply tank. According to the efficient machine for desalting sea water, the technology of using smoke to release heat on high-speed spraying by an orifice spraying method is adopted, so that the heat transfer coefficient of the device is improved; the technology of using the excess heat of the smoke is preheated on the sea water, so that the smoke is secondarily used in the device, and the energy use ratio of the device is improved; the two-stage preheating technology of the fed material sea water is adopted, so that the temperature of the preheated sea water is raised; and the technology of using the film forming device to form rotary water film at the heat exchange surface of a round table body is adopted, so that the heat transfer effect and the evaporation effect of a water side are effectively improved. Therefore, the efficient machine for desalting sea water has the advantages of high energy use ratio and good heat transfer effect, and is suitable for the demands of places, such as ships, islands and enterprises on middle or small sea water desalting devices.

The invention discloses an improved gravity assisted heat pipe radiator used for a high-power LED, which comprises an improved gravity assisted heat pipe and radiating fins, and is characterized in that the improved gravity assisted heat pipe consists of a flat-plate-shaped evaporation section and a cylindrical condensation section, wherein the evaporation section is directly connected with an LED circuit baseplate; the condensation section is connected with the radiating fins; a heat conduction column is arranged on the inner wall of the lower end of the evaporation section; a reflux tank channel is axially arranged on the inner wall of the condensation section; the interior of the heat pipe is vaccumized and is filled with a heat-conducting medium; and the inner wall of the heat pipe is sandblasted for heat transfer enhancement. The improved gravity assisted heat pipe radiator used for the high-power LED transmits the heat to the radiating fins rapidly by the circulating convection with the participation of gravity, and has the benefits of flexibility, convenience, simplification, low cost, high start speed, capability of accelerating the radiating rate with the temperature rising of the high-power LED, and the like.

An improved method of increasing the power output of an existing nuclear power plant includes increasing the thermal power output of the plant's nuclear island and constructing of an auxiliary BOP to handle the increased thermal power. The thermal power of the nuclear island can be increased such as by increasing the thermal power of the plant's reactor, by replacing the plant's steam generator with one that is more efficient, and by increasing the flow rate and / or change in temperature of a coolant in a secondary cooling loop of the plant. The thermal power of the reactor can be increased such as by replacing existing cylindrical fuel rods with fuel rods having a relatively greater surface area to volume ratio and / or by increasing the flow rate and / or the change in temperature of a coolant of a primary cooling loop. The auxiliary BOP can be constructed while the plant is in operation, and can then be connected with the nuclear island during a maintenance operation on the reactor.

A heat exchanger finned tube 10 for use in fabricating a heat exchanger 1 useful as the evaporator for refrigerators or the like wherein a hydrocarbon refrigerant is used. Two tube insertion holes spaced apart from each other are formed in each of plate fins 12, and two straight tube portions 11a of a hairpin tube 11 are inserted through the respective holes of each plate fin to arrange the plate fins 12 in parallel into a plurality of fin groups 13 spaced apart on the straight tube portions 11a longitudinally thereof. The hairpin tube 11 is enlarged with use of a fluid to fixedly fit the plate fins 12 of each tin group 13 around an enlarged tube portion 14 of the hairpin tube 11 and provide a finless part 19 between each pair of adjacent fin groups 13 on each of the straight tube portions 11a. A restrained small-diameter portion 15 is provided in each of the finless parts 19 of each straight tube portion 11a. The heat exchanger 1 fabricated using the finned tube 10 exhibits the desired refrigeration performance with the leakage of refrigerant diminished.

The invention relates to a nanometer molten binary nitrate heat-transfer heat-storage medium and a preparation method thereof and belongs to the field of solar photo-thermal electricity generation. The nanometer molten binary nitrate heat-transfer heat-storage medium is characterized in that nano-particles are dispersed in a KNO3-NaNO3 and KNO3-NaNO2 solid-liquid phase-change molten binary nitrate system at a high temperature so that the nanometer molten binary nitrate heat-transfer heat-storage medium is compounded, and the nano-particles comprise SiO2, ZnO, Al2O3, TiO2, CaO and / or MgO nanoparticles. The nanometer molten binary nitrate heat-transfer heat-storage medium solves the problem that the existing nanometer molten binary nitrate system has a low heat conductivity coefficient, poor heat stability and a narrow use temperature scope and can be widely used in the technical field of solar photo-thermal electricity generation.

A cooling structure of a turbine airfoil cools a turbine airfoil (10) exposed to hot gas (1), using cooling air (2) of a temperature lower than that of the hot gas. The turbine airfoil (10) includes an external surface (11), an internal surface (12) opposite to the external surface, a plurality of film-cooling holes (13) blowing the cooling air from the internal surface toward the external surface to film-cool the external surface, and a plurality of heat-transfer promoting projections (14) integrally formed with the internal surface and protruding inwardly from the internal surface. The turbine airfoil further includes a hollow cylindrical insert (20) which is positioned inside the internal surface of the turbine airfoil and to which the cooling air is supplied. The insert has a plurality of impingement holes (21) for impingement-cooling the internal surface (12).

The invention provides a heat exchanger. The heat exchanger comprises a pipe pass side and a shell pass side; the pipe pass side includes an inlet pipe, an inlet cavity, a heat transfer pipe bundle, an outlet cavity and an outlet pipe; a hot fluid enters the inlet cavity from the inlet pipe to pass through the heat transfer pipe bundle, the outlet cavity and the outlet pipe in sequence; the shell pass side includes an inlet channel, an inner shell, an outer shell and an outlet cavity; a cold fluid passes through space limited by the inlet channel, the inner shell and the outer shell and the outlet cavity in sequence; the inlet cavity, the heat transfer pipe bundle and the outlet cavity are arranged in space limited by the inner shell and the outer shell; a metal rod outwards extends from the outer wall of the heat transfer pipe bundle; the end part of the metal rod is a sharp structure; and the direction from the outer wall of the heat transfer pipe bundle to the end part of the metal rod is opposite to the flowing direction of the cold fluid. The rod with the sharp end part is arranged at the external of the heat exchange pipe; in flowing of a gas-liquid two-phase flow, on the one hand, the laminar flow bottom layer can be broken, and the heat transfer area is increased for forced heat transfer; because of the rod, the flowing resistance is low, and the shell pass flowing resistance cannot be increased; and as the sharp end part is provided, bubbles can be punctured to realize increment of a gas-liquid interface and a gas-phase boundary layer and reinforcement of the disturbance.

A device for the coal ventilation gas comprehensive utilization, a reactor outlet end with the same structure is connected into a U-shape reactor through a heat taking device; the entrance of the reactor is filled with a honeycomb heat retaining mass; the outlet end is a catalyst bed layer; an electric heater is arranged between the heat retaining mass outlet end and the catalyst bed layer; the entrance of the raw gas is provided with a valve set for controlling the conversion of the current direction in the reactor; the raw gas enters the reactor, and generates the catalytic combustion on the catalyst bed layer; a saddle type bed temperature distribution is realized in the reactor by processing the periodic switch through the current direction of the reaction gas, the burning end gas is fetched out by the heat taking device. The invention has higher heat reclaim efficiency; when the concentration of the methane in the ventilation gas and the flow of the ventilation gas change, the high efficiency selfheating operation can be realized.

A thermocycler has, as heating devices, a plurality of heating blocks each with a respective coupling face, for heating at least one stationary specimen that during one temperature cycle has a plurality of temperature levels. The plurality of heating blocks is pivotably disposed, and the pivot axis is oriented perpendicularly to the coupling faces. The thermocycler is especially well suited for performing the polymerase chain reaction.

The invention relates to a screw agitation reactor of the freezing mixture and the use and the polyreaction technique. The reactor includes the support, the tubular material trough which has the material entrance and the export circle, the bearing, the spiral stirrer, the gland seal and the power dragging turning gear. It is suitable for producing polymer by the solution polymerization method technological process like synthetic rubber, the plastic and the textile fiber, especially suitable for synthesizing isoprene rubber and cis-butadiene rubber in the rare earths catalysis system. It replaces the complete mixing flow type of the completely backmixing by the plug flow type of no backmixing, strengthened the polyreaction process and the heat transfer process, the reactor volume is reduced obviously, the energy consumption is reduced largely, the polymer performance is enhanced.

A cell intensifying heat exchanging pipe comprises a base pipe and a cell group composed of projected spherical crown cell from an inner wall to an outer side and distributed evenly along circle of the base pipe. A plurality of the cell group is distributed along the base pipe flowing direction. Because the invention is provided with projected cell on the base pipe that effectively enhances heat transporting area in the pipe, a border layer of the inner wall of the pipe is regularly destroyed and overflow degree of the fluid in the pipe is enhanced to a great extent, which improves heating exchanging coefficient of the pipe side; At the same time, proportion of the heat exchanging amount is greater than that of the resistance addition, which further realizes the effect of improving synthesized heat exchanging performance.

The cooling performance of a wet disc clutch pack is improved by using a segmented steel reaction plate. The segmented configuration of the reaction plate forms a triangular shaped groove with an unsegmented reaction plate. The groove channels cooling lubricant in a manner to increase the convective heat transfer area for the flow of cooling lubricant, whereby to improve the cooling of the clutch pack.

The invention discloses a preparation method of a polyurethane trimer curing agent of a low free isocyanate monomer, comprising the following steps of: under the protection of nitrogen, firstly putting an isocyanate monomer and an esters solvent into a reaction container to evenly stir, wherein the temperature is kept at 50-90DEG C; dropwise adding diamine into the reaction container under the condition of stirring, wherein the dropwise adding time is 1-1.5 hours; and after dropwise adding, adding a catalyst of which the mass is 0.1-0.5% of that of the isocyanate monomer once, continuing stirring and reacting at the temperature of 70-100DEG C for 3-6hours, when the NCO base content is 20%-25%, immediately adding the polymerization inhibitor of which the mass is 0.1-1% of that of the isocyanate monomer, keeping the temperature for 1-2hours, and discharging in a cooling way. The polyurethane trimer curing agent prepared by the preparation method can be better compatible with the resin, can be quickly solidified under normal temperature, and has the advantages of being higher in mechanical strength, modulus, adhesion, etc.

The invention disclose a intensive heat conducting tube applied to high mucosity liquor cooler, heater or cooling device in air compressor on energy, power, fossil, chemistry fields. It comprises exterior basal tube, inner core tube with two ends jamming and wave wing fins set between the inner core tube and exterior basal tube arranged along inner core tube uniformly. Set two or more through holes on the side wall of the wave wing fins. In consequence that there are holes on the wave wing fins, the inner flowing channel of the tube is a non-complete-separated round flowing channel. The inner wing fin with holes increases the flowing speed gradient with disturbing the border layer improving the association between fluid speed and the temperature gradient. Meanwhile due to the number of fins and the holes on the fins, the heat exchanger performance is enhanced so to lower the size of heat exchanging device and lower the production cost.

The invention discloses an electromagnetic water heater which uses electromagnetic heating theory to realize water-electricity separation and high safety. Wherein, the heating unit comprises: the outset part is a thermal-insulated ceramic cup sleeve coiled with electromagnetic coil; the inner part is a embedded multilayer metallic electromagnetic heating tube; the end is sealed by the a cover with cold water inlet and hot water outlet; the embedded structure and effectively increase the path of water; the water flows two surfaces of metallic electromagnetic heating tube, to increase the heated area and improve the heat exchange efficiency; the water will flow from outer to inner, therefore, the water will be stepped heated to decrease the heat loss most; the cold water first flows between the ceramic sleeve and the outset metallic electromagnetic heating tube, to cool the electromagnetic coil. The invention has simple structure, modularized processing and installment, while several heating units can be serially connected to realize multi-step heating.

An air-conditioning apparatus uses carbon dioxide as a refrigerant, and includes comprises a two-stage-compression-type compression mechanism, a heat source-side heat exchanger, an expansion mechanism, a usage-side heat exchanger, and an intercooler. The intercooler uses air as a heat source. The intercooler is configured and arranged to cool refrigerant flowing through an intermediate refrigerant tube that draws refrigerant discharged from the first-stage compression element into the second-stage compression element. The intercooler is integrated with the heat source-side heat exchanger to form an integrated heat exchanger, with the intercooler disposed in an upper part of the integrated heat exchanger.

The invention relates to a dimpled enhanced heat exchange tube, which comprises a base tube and dimple groups formed by ellipsoid crown type dimples which are processed from the external wall of the base tube to the inside according to certain array on the tube wall of the base tube, wherein the dimple groups are evenly distributed along the axial direction of the base tube according to certain cycle and separation distance. Because the base tube is processed with the novel dimples, the comprehensive performance of the heat exchange tube is improved compared with the former similar heat exchange tubes. The dimpled enhanced heat exchange tube has the following characteristics: 1, the ellipsoid crown type dimples increase the heat transfer area in the tube and increase the flow velocity of fluid; 2, boundary layers of the inner wall of the tube are destroyed more effectively; 3, the ellipsoid crown type dimples having certain included angle with the axial direction make the fluid generate longitudinal vortexes; and 4, the continuous changes of the cross section of the tube and the generated pressure changes increase the turbulivity of the fluid in the tube to further improve the tube side heat exchange coefficient, and while the tube side heat exchange coefficient is improved, the ellipsoid crown type dimples having certain included angle with the axial direction make the fluid generate secondary flow which has smaller increase to the fluid resistance, thus the effect of improving the comprehensive heat exchange performance is achieved.

An extracting and concentrating process for Chinese medicine includes such steps as loading raw Chinese-medicinal materials in extractor adding solvent, steam heating to obtain liquid, boiling evaporating in vacuum state, condensing the secondary vapour to obtain liquid, switching it to the liquid distributor of extractor, spraying it on the surface of Chinese-medicinal materials, and repeating said steps for extracting while concentrating. Its apparatus is composed of extractor, condenser, vacuum switching device, heater and evaporator. Its advantages are simple and compact structure, simple process, high extraction rate, less loss and low secondary pollution.

A cooling structure for uniformly cooling a bore wall of a cylinder block using a cooling medium, the bore wall surrounding plural bore regions, includes a water jacket portion which is provided so as to surround an entire outer periphery of the bore wall, and which is supplied with the cooling medium; and a water jacket spacer which is inserted in the water jacket portion such that a space is provided between the bore wall and the water jacket spacer. The cylinder block includes an inter-bore region which is positioned in a vicinity of a boundary between the bore regions adjacent to each other, and a region other than the inter-bore region; and a cross sectional area of the space between the bore wall and the water jacket spacer in the inter-bore region is smaller than a cross sectional area of the space between the bore wall and the water jacket spacer in the region other than the inter-bore region.