The heat exchanger
(57) Abstract:Usage: as a cooler or condenser, mostly of the air conditioning systems of vehicles. The essence of the invention: reduction of hydraulic losses in the channels of the heat exchanger is ensured by the fact that it is made in the form of a coil of the multi-channel flat tube 1 with external fins, equipped with inlet and outlet manifolds. When the heat exchanger is supplied installed inside the pipe 1 between the said reservoir by a partition 5, the overlapping area of passage mentioned pipe, and additional output 6 input 7 collectors connected to the latter on the go working environment respectively before and after the partition 5. The presence of the partition 5, as well as additional input 7 and output collectors reduces the length of the path passable environment from its entry into the heat exchanger to the exit, leading ultimately to the reduction of hydraulic losses in the channels of the heat exchanger, and thus to improve the heat exchange efficiency. 2 Il. The invention relates to the field of refrigeration technology and can be used as an air cooler is the local air cooler, containing the coil in the form of pascavale multi-channel tube having at least three branches, connected by rolls connected to the input and output manifolds and equipped to provide the minimum superheat of the refrigerant in the channels of the pipe, at least one mixer, common to all channels (A. C. USSR N 1267133, IPC F 25 39/02). However, for this design of cooler characterized by large hydraulic losses in the channels of the coil, resulting in lower efficiency of heat transfer.As a prototype of the selected heat exchanger used as a condenser, is made in the form of a coil of finned pascavale multichannel tubes, channels which are connected to inlet and outlet manifolds (S. R. Gopin,C. M. Sabra, Air condensers of small refrigeration machines. M Agropromizdat, 1987, S. 69).However, for this heat exchanger is also characterized by large hydraulic losses in the channels of the coil, resulting in lower efficiency of heat transfer. This is due to the great length of the way, let the refrigerant from the inlet of the heat exchanger to the exit.The problem to which the invention is directed to develop a compact heat exchanger, oberheitmann the air conditioning system of a vehicle having a high heat transfer capability.The technical result of the reduction of hydraulic losses in the channels of the heat exchanger.This technical result is achieved in that the heat exchanger in the form of a coil of finned multi-channel flat tubes with inlet and outlet manifolds, according to the invention, provided with at least one baffle in the pipe, blocking its flow section and located between the said reservoir, and at least one output and one input of additional collectors connected to the pipe in the course of the working environment, respectively, before and after partition.The presence of the heat exchanger, at least one septum, placed inside the pipe blocking its flow section and appropriately located relative to said reservoir, and at least one output and one input of additional collectors connected to the pipe in the course of the working environment, respectively, before and after partition, reduces) the length of the path, let the refrigerant from the inlet of the heat exchanger to the exit, leading ultimately to reduce hydraulic losses in the channels of the heat exchanger, and therefore more effective the zone of connection of additional input and output manifolds. Heat exchanger in the form of a coil of pascavale multi-channel tube 1 with outer fins 2. The coil is supplied with an input 3 and output 4 collectors, partition 5, is installed inside the pipe 1 in the roll of the coil between the reservoir 3 and 4 and overlying the flow area of the pipe. Channel pipe located downstream of the working environment to the walls 5, is connected to the output collector 6, and to the channels of the pipe located after it, additional inlet manifold 7. To improve the manufacturability of the heat exchanger auxiliary input 7 and output 6 collectors has a common collector chamber 8, which has on both sides of the pipe 1 open ends and separated installed diagonally mentioned by a partition 5 into two parts, one of which serves as a reservoir chamber for more input and more output collector. Around the perimeter of the open end of each chamber W, the pipe is welded pipes 9 and 10 respectively of the inlet and outlet headers.The heat exchanger works as follows. (An example is shown for operation of the heat exchanger as cooler.) Liquid refrigerant is fed to heat the outer fins 2, in the multi-channel tube 1 is the refrigerant. The steam generated by boiling of the refrigerant in the channels of the tube 1 located in the course of the working environment to the walls 5, via an additional output collector 6 is removed from the heat exchanger. Similarly, the heat exchange process occurs in the channels of the tube 1 located along the working environment after the partition 5. In this case, steam generated in these channels in the boiling of the refrigerant admitted into the heat exchanger through an additional inlet manifold 7, is removed from the heat exchanger through an outlet manifold 4.As follows from the above, each of the parts of the heat exchanger, as found in the course of the working environment to the walls, and after it, has its input and output manifolds and works as an independent heat exchanger, while having a much smaller length of the channels, which significantly shortens the path of passage of the refrigerant through the coil from its entrance into the heat exchanger to the exit. In addition, compared with the prototype, increases the living section of the channels for the passage of refrigerant. All of this ultimately leads to the reduction of hydraulic losses in the channels of the heat exchanger, th is the length of the pipe, and thus to improve the heat exchange efficiency. In addition, the reduction of hydraulic losses in the channels of the heat exchanger when it is used as an air cooler provides the possibility of applying a more simple thermostatic expansion valves with internal pressure compensation. The heat exchanger in the form of a coil of finned multi-channel flat tubes with inlet and outlet manifolds, characterized in that it is provided with at least one baffle in the pipe, blocking its flow section and located between the said reservoir, and at least one output and one input of additional collectors connected to the pipe in the course of the working environment, respectively, before and after partition.
FIELD: compensation of refrigerant vapors in refrigerating plants.
SUBSTANCE: the eddy evaporative condenser has eddy heat exchangers in the form of large - diameter pipes with U-shaped ribs forming ducts for passage of refrigerant secured on the outer surface, axial-flow fans with profiled blades, nozzle fin with nozzles, circulating pump, filter, tray, drop separator and an outer guard. Eddy of air flow in the heat exchanger is effected by the axial-flow fan with profiled blades installed at angle ϕ=40°-65° between the generating line of the fan body and the tangent line to the blade at the air outlet hear the body wall. Eddy heat exchangers are made with a ribbing coefficient varying in accordance with relation: γ=πD/(nl)=1-5, where D - the pipe diameter; n-quantity of ducts; l-the duct width, which in turn vary within D=400-1000 mm; l -20-140 mm; the duct height l1=20-60 mm; pipe wall thickness δ=3-6 mm; duct wall thickness, δ1=2-4 mm, and pipe length L to diameter ratio D, L/D≤40.
EFFECT: reduced power and mass characteristics of the offered evaporative condenser.
2 cl, 5 dwg
FIELD: refrigeration equipment.
SUBSTANCE: condenser comprises pipe for freon (halon) circulation and surface area developing components. The surface area developing components are made as metal strips and welded to coiled pipe so that angle between strip planes and condenser plane is equal to 40-80°. Strips extend towards rear refrigerator chamber wall.
EFFECT: increased operational efficiency of refrigerator, improved thermal and physical characteristics and decreased power inputs.
FIELD: refrigeration industry.
SUBSTANCE: invention relates to refrigeration industry and consists in that the household refrigerator condenser incorporates a coolant coil and a vessel enveloping the coil to receive evaporating coolant. The coil together with the vessel make a pipe-in-pipe unified design with the inner pipe carrying the coolant and the outer one intended for cooler which is a low-boiling fluid. Note here, that the outer pipe is a natural cooling system evaporator, the system condenser being arranged in the open air and connected to the evaporator and vapour- and condensate piping.
EFFECT: increase in coolant refrigeration intensity, power saving, smaller overall dimensions and lower condenser noise.
SUBSTANCE: heat exchanger with receiver tank contains the main part, receiver tank and connecting element. The main part consists of two collectors and heat pipes which are located parallel to each other and which opposite ends communicate with collectors. Refrigerant condenses in condense section formed by the heat exchange tubes. Receiver tank has an inlet and outlet at its lower end. Refrigerant, introduced through the receiver tank inlet, accumulates in it and only liquid refrigerant flows out the outlet of receiver. Connecting element is designed to connect the receiver tank with one of the two collectors. Connecting element comprises the main part, insert flowing channel and inlet fluid passage. At the upper end of the connecting element insert flowing channel a separating element is formed in the type of flange which peripheral edge is connected to the inner peripheral surface of one of the two receiver tanks, and which shares the interior space of the receiver tanks.
EFFECT: compatibility; decreased number of used parts and their costs; improvement of production effectiveness while assembling the condenser.
41 cl, 9 dwg
SUBSTANCE: invention concerns home appliances and can be applied in absorption and diffusion cooling aggregates (ADCA). ADCA operation method involves cooling agent evaporation in generator from saturated solution, cooling agent vapour condensation in condenser, and fluid cooling agent evaporation in evaporiser. During dripping down the inner surface of condenser, fluid cooling agent is divided by spargers into several flows, and each flow is further directed in respective separate evaporiser. Spargers are connected tightly to inner surface of the condenser and to each other.
EFFECT: reduced size and metal cost of evaporiser, simplified construction and manufacturing method of ADCA.
SUBSTANCE: in heat exchanger comprising tubular vessel open on both end sides, where pipeline is installed intended for passage of the first coolant in it and when unrolled having length larger than length of vessel, external lining of vessel, at least in the area of the first end side there are holes, besides holes may be evenly distributed along side surface of vessel lining, share of holes area may reduce as distance increases from the first end side of vessel, besides as distance increases from the first end side, cross section of holes may reduce, and pipeline for the first coolant may be arranged in the form of spiral or meander. Specified heat exchanger may be used as condenser in refrigerating device.
EFFECT: increased efficiency of specified heat exchanger.
13 cl, 4 dwg
FIELD: machine building.
SUBSTANCE: refrigerating unit (1) operating in absorption-diffusion cycle consists of pipe (6) of condenser passing through radiator (2) and enveloped with it from outside. The radiator also has a sealed case forming an internal cavity enveloping the pipe of the condenser designed for filling with liquid heat carrier. Cross section of the radiator passing across the condenser pipe converges to minimal thickness in the direction of an upper end of the radiator at its usage in the refrigerating unit.
EFFECT: raised efficiency.
18 cl, 5 dwg
SUBSTANCE: refrigerating device with cooled inner space has circulating cooling circuit for cooling agent. Circulating cooling circuit has heat exchanger that is located in cooled inner space, compressor for cooling agent and condenser, which are located beyond the limits of inner space. Reservoir containing a plastic pack filled with liquid is provided as heat accumulator contacting the condenser, and on upper side of the reservoir there installed is device for heat removal from heat accumulator to atmosphere.
EFFECT: use of this invention allows reducing the volume of condenser, and as a result, increasing the volume of cooled inner space.
8 cl, 6 dwg
FIELD: power engineering.
SUBSTANCE: condenser (1) with supercooling unit comprises an inlet collector (2) of gas, a supercooling collector (4) arranged under the inlet collector (2) of gas and connected to the inlet collector (2) of gas by means of at least one condensing pipeline (12), having a condensing surface, and a collector (6) of liquid coolant connected to the supercooling collector (4) at least by one cooling pipeline (14), having cooling surface, a condensing pipeline (12), leading to the upper part of the supercooling collector (4), and at least one cooling pipeline (14), connected to the lower part of the supercooling collector (4) so that the supercooling collector (4) makes it possible to compensate for a gaseous coolant (10a).
EFFECT: simplified design of the condenser and provision of better adjustment of temperature.
19 cl, 2 dwg
FIELD: power industry.
SUBSTANCE: cooling method of condenser of domestic compression refrigerator involves moistening of the surface of condenser coated with heat-conducting absorber. Condenser surface is sprayed with air-water mixture from fine atomisers with an actuator. According to the first version, switching on/off of the actuator is performed as per the signal supplied from condenser surface humidity sensor. As per the second version, switching on/off of the atomiser actuator is performed with thermal relay of compressor at its activation/deactivation.
EFFECT: use of the invention will allow improving the cooling intensity of condenser, simplifying the design, improving the cooling reliability and reducing specific consumed power.
2 cl, 1 dwg
FIELD: mechanics, heating.
SUBSTANCE: in compliance with the invention, the heat exchanger-modular water heater incorporates one or two modules each comprising, at least, two heat exchanger units integrated by a diffuser to feed a cooling medium and a confuser to withdraw the medium to be cooled, primarily, a turbine hot exhaust gas. It also comprises the manifolds feeding and withdrawing the medium being heated, primarily, air, each communicating, via a tube plate, with, at least, one multi-row bank of multipass heat exchange pipes, the various pipes being furnished with bends varying in number from four to six and forming four rectilinear runs combining their three bends. Note here that the spacing in, at least, one direction, within the band cross section, of a part of the pipes or within their limits, or of, at least, one bank of the pipes out coming from the medium feed manifold, or, at least, in one of the next runs in the same direction does not comply with that of the pipes or a part of them in their bank run right nearby the manifold withdrawing the medium being heated and/or in one of the previous bank runs. The unit of the heat exchange-modular air heater comprises four runs of the heat exchanger pipe multi-row four-pass bank, the said pipes being laid in horizontal rows spaced in horizontal and vertical planes, the manifolds feeding and withdrawing the medium being heated, each being connected, via separate tube plates, with heat exchanger pipes, each tube plate being mounted in the aforesaid manifold walls. Note here that the spacing in, at least, one direction, within the band cross section, of a part of the pipes or within their limits, or of, at least, one bank of the pipes out coming from the medium feed manifold, or, at least, in one of the next runs in the same direction does not comply with that of the pipes or a part of them in their bank run right nearby the manifold withdrawing the medium being heated and/or in one of the previous bank runs. In compliance with the proposed invention, the aforesaid heat exchanger unit-modular air heater comprises a carcass, a bottom, and upper and lower casing walls, a diffuser to feed the medium to be cooled and a confuser to feed the aforesaid medium, manifolds feeding and withdrawing the medium to be heated and furnished with tube plates that form, in every row, an even number of rectilinear multi-pipe banks including, at least, two inner and two outer banks integrated by constant-radius bends. Note here that the unit housing bottom, cover and one of the side walls represent panels with a reinforcement framing elements forming a flat rod systems, while the unit carcass is formed by a set of the aforesaid flat rod systems with intermediate posts inter jointing the aforesaid systems and the manifolds housings rigidly fixed thereto and, in their turn, attached to the unit bottom and inter jointed via two-ring diaphragms and a pipe medium displacer. Note that the parts of the aforesaid manifolds housings with the aforesaid tube plates and pipe medium displacer fitted therein form, when combined, the unit housing rigid face wall while the side walls allow fastening the diffuser and confuser elements. Note here also that the spacing in, at least, one direction, within the band cross section, of a part of the pipes or within their limits, or of, at least, one bank of the pipes out coming from the medium feed manifold, or, at least, in one of the next runs in the same direction does not comply with that of the pipes or a part of them in their bank run right nearby the manifold withdrawing the medium being heated and/or in one of the previous bank runs. In compliance with this invention, the aforesaid heat exchanger unit-modular air heater incorporates a multi-row heat exchanger pipe bank made up of, at least, two bundles of two-pass U-pipes forming, within one bundle, two-run horizontal rows of pipes spaced apart both in rows and between rows, manifolds of feeding and withdrawing the medium being heated and, at least one bypass chamber arranged there between. Note here that the aforesaid manifolds and the bypass chamber communicate with the heat exchanger pipes via a common tube plate or separate tube plates, at least, one part of the said plates forming a part of the aforesaid manifolds enclosure walls. Note also here that the spacing in, at least, one direction, within the band cross section, of a part of the pipes or within their limits, or of, at least, one bank of the pipes out coming from the medium feed manifold, or, at least, in one of the next runs in the same direction does not comply with that of the pipes or a part of them in their bank run right nearby the manifold withdrawing the medium being heated and/or in one of the previous bank runs.
EFFECT: higher heat exchange efficiency, lower metal intensity of regenerative air heater.
34 cl, 15 dwg
FIELD: mechanics, heating.
SUBSTANCE: in compliance with the invention, the heat exchanger-modular water heater incorporates one or two modules each comprising, at least, two heat exchanger units integrated by a diffuser to feed a cooling medium and a confuser to withdraw the medium to be cooled, primarily, a turbine hot exhaust gas. It also comprises the manifolds feeding and withdrawing the medium being heated, primarily, air, each communicating, via a tube plates fitted directly in the said manifold walls, with the multi-row bank of the four-pass heat exchanger variable standard-size pipes, the said standards sizes being calculated from the ratios covered by this invention and the aforesaid tube plates being secured by appropriated spacers. The multi-row bank can be made up of, at least, two trains of two-pass U-shape pipes integrated by the aforesaid manifolds and, at least, one bypass chamber.
EFFECT: high-efficiency heat exchanger, lower heat exchanger metal input, optimum design and spacers, higher design rigidity, simpler assembly of heat exchange pipe banks.
21 cl, 16 dwg
FIELD: power engineering.
SUBSTANCE: invention can be used in feed water heaters of thermal and nuclear power plants. Proposed heat exchanger consists of a shell inside which a central header and vertical tube platens connected with their ends to appropriate central header chambers are installed. At that each platen is made at least of one "П"-shaped section with transverse parts installed in the shell one above the other, and intermediate part wherein external tubes are installed longitudinally on the shell side, and internal tubes are located on the header side. Internal tubes of the intermediate section part are made with additional sections bent in the direction of central header and located between transverse parts of this section. In this case average tube length makes bigger in each platen, which leads to less number of tubes used in each platen, and therefore to velocity increase in tube and intertube spaces of platens and heat exchange intensification, which finally reduces heat exchanger specific amount of metal.
EFFECT: reducing thermal and hydraulic maldistributions in platens, which also improves platen heat exchange and reduces to a greater degree the heat exchanger specific amount of metal.
FIELD: heating systems.
SUBSTANCE: invention refers to heat engineering and can be used during arrangement of high thermally stressed heat exchanger of nuclear power plant. In heat exchanger consisting of bank of heat exchange coil tubes the ends of which are fixed in tube sheets arranged in the form of a platen, straight sections of several coil tubes are located consequently in one plane, and bent sections are opened to the side from location plane of straight sections; at that, opening of bends of opposite ends, straight sections, is made to different sides.
EFFECT: providing maximum compactness of tube bank of heat exchanger and reaching high degree of heat exchange efficiency owing to arrangement of heat removal surface itself during operation, increasing life time of reliable operation of heat exchanger design at high specific thermal stresses of the volume occupied with it.
SUBSTANCE: invention refers to heat engineering and can be used as heat exchanger of nuclear power plant operating in variable load conditions. In heat exchanger containing a bundle of heat exchange zigzag-shaped tubes with external finning in straight sections, which is installed in the housing, spacers arranged between tubes of the bundle so that mixing chambers are formed in the bending area of the latter, the spacers have thickenings in straight tube sections and grooves evenly spaced relative to them so that an individual channel is formed around each tube, which interconnects mixing chambers to each other.
EFFECT: providing forced heat exchange for obtaining small overall dimensions of equipment owing to increasing uniform temperature field in cross section of tube bundle, and decreasing relative tube deformation at thermal elongations.
FIELD: oil and gas industry.
SUBSTANCE: heating device of high-viscous oil products and their mixtures includes cylindrical housing with inlet and outlet covers with the appropriate inlet and outlet connection pipelines, tube grids located inside the housing, and distributing inlet and outlet boxes equipped with inlet and outlet tubes respectively and interconnected with ends of tube grids for pumping of heat carrier. Housing is located vertically, lower outlet cover is tapered with outlet connection pipe in lower part, which is enveloped below that cover with inlet distribution box which has the possibility of exchanging the heat with taper surface of lower cover, and upper inlet cover is equipped with inlet connection pipe installed coaxially with the housing; at that, tube grid is made in the form of hopper bent inside the housing and converging downwards; inside that hopper there located is baffle plate distributing the flow of oil products to tube grids and uniformly connected along the perimetre at least to three tubes of the grid with heat-conducting plates.
EFFECT: device is reliable-to-operate, and uniform resistance to flow of oil products is provided.
FIELD: power engineering.
SUBSTANCE: plant comprises a jacket that passes in longitudinal direction between the head end and the base end, inside which there are inbuilt elements that form a heat-exchange and a mixing structure. Besides, there is coolant medium supply as an internal flow into pipes of inbuilt elements from the base end to the head end and fluid supply as an external flow from the head end to the base end. The plant comprises reinforcement elements to stabilise inbuilt elements in longitudinal direction from pressure gradients developed by fluid, besides, in the main area they are joined with reinforcement elements into a partial structure, which is not exposed to thermal expansion, and in the side area they remain at least partially non-reinforced to form a partial structure capable of thermal expansion in longitudinal direction.
EFFECT: increased efficiency of heat exchange, improvement of the plant.
14 cl, 4 dwg