Abstract: A fluid conveying tube included in a vehicle cooler comprises on its inside first and second opposite longitudinal primary heat exchange surfaces, and flow-directing surface structures which are arranged on the primary surfaces. Each surface structure comprises a plurality of elongate directing elements projecting from the primary surfaces. The surface structures are alternatingly arranged on the first and second primary surfaces in such manner that directing elements, succeeding in the longitudinal direction of the primary surfaces, are alternatingly arranged on the first and second primary surfaces and are mutually inclined at a given angle (?). Each surface structure comprises a laterally extending row of mutually parallel directing elements. Thus an input fluid flow is divided into a number of parallel partial flows which follow a respective spiral-shaped flow path through the tube, whereby a high heat exchanging capacity is achieved.

Abstract: The invention relates to a heat exchanger for motor vehicles, having a large number of flat tubes through which a liquid cooling medium can flow, and having corrugated fins which are associated with these flat tubes and to which environmental air or other media can be applied. The flat tubes having indentations pointing inward on at least one of their flat faces. Heat transfer between the core flow of the cooling medium and the flat tube walls is improved, and the power density of the heat exchanger is thus increased. The indentations are preferably in the form of elongated vortex generators.

Abstract: An air-conditioning system for a motor vehicle contains a heat exchanger with a heat-exchanger tube that features a profiled central channel and outer channels grouped around the central channel. This heat-exchanger tube is suitable for the construction of counterflow heat exchangers. For this purpose, the heat-exchanger tube is to be cut to corresponding lengths and provided with corresponding end pieces. Such heat exchangers have proven to be light, pressure resistant, and effective.

Abstract: The invention relates to a black liquor gun (4) for feeding black liquor into a recovery boiler (1), comprising a nozzle (11) to be inserted into a furnace (2). Inside the black liquor gun (4) there is a flow guidance element (16), which provides an annular flow channel between the outer wall (14) and the flow guidance element (16).

Abstract: A heat exchanger tube is provided that includes an inner diameter, an outer diameter and a longitudinal axis. The heat exchanger includes at least two spiral upsets protruding from the inner diameter of the tube and spiraling around the longitudinal axis of a length of the tube. The at least two spiral upsets include a first spiral upset having a cross-sectional shape, a depth of protrusion from the inner diameter, a pitch, and an angle with respect to the longitudinal axis, and a second spiral upset having a cross-sectional shape, a depth of protrusion from the inner diameter, a pitch, and an angle with respect to the longitudinal axis. In one embodiment, the angle of the first spiral upset with respect to the longitudinal axis is approximately equal to the angle of the second spiral upset with respect to the longitudinal axis, such that the first and second spiral upsets are approximately parallel.

Abstract: A stacked-type, multi-flow heat exchanger includes a plurality of heat transfer tubes. Each of the heat transfer tubes includes a first tube plate and a second tube plate connected to the first tube plate, such that the first tube plate and the second tube plate form a refrigerant path within the heat transfer tube. Each of the heat transfer tubes also includes an inner fin having a wave shape, positioned within the refrigerant path and extending in a longitudinal direction along the refrigerant path. Moreover, the heat exchanger includes a plurality of outer fins. The plurality of outer fins and the plurality of heat transfer tubes are stacked alternately. The heat exchanger further includes a plurality of projection portions formed on the first tube plates and the second tube plates, such that the projection portions project into the refrigerant path and extend in an oblique direction relative to the inner fin. Further, the inner fin is connected to the plurality of projection portions.

Abstract: An absorption-type air conditioner core structure is provided, which uses lithium bromide solution as absorbent and has a small volume and compact structure. The air conditioner core structure includes an upper vessel (24) and a lower vessel (21). The upper vessel and lower vessel are connected by a refrigerant water pipe (22), a cooling water pipe (7), a heating steam pipe (5), two concentrate solution pipes (27, 58) and two dilute solution pipes (46, 52). The concentrate solution and dilute solution pipes are disposed within a solution pipe protecting cover (23) which connects to both vessels. Because of its compact structure, small volume, fewer welding seams, high level of vacuum, and having the heat exchange pipes (30, 39, 61, 73) of the condenser 1, low temperature generator 2, evaporator 10 and absorber 11 all made of helical copper pipes, the air conditioner core structure has high heat exchange efficiency.

Abstract: The present invention relates to a condenser for radiating heat of a high temperature and high pressure refrigerant discharged from a compressor to room temperature air and cooling water to condense and liquefy the refrigerant, and more particularly, to a condenser provided with a condensing tube and a cooling plate for helping heat radiation of the condensing tube, the condensing tube and the cooling plate being provided in various structures, thereby improving a condensation efficiency. The condenser includes: a condensing tube 10 including a refrigerant inlet 12 formed at one end thereof, a refrigerant outlet 14 formed at the other end thereof, and a passage pipe 16 having a heat radiation protrusion formed on an outer circumference thereof; and a cooling plate having a groove 22 on which the condensing tube is mounted so as to prevent a separation of the condensing tube, and a plurality of bent pieces 24 formed protruding from left and right sides of the groove 22.

Abstract: A condenser of a condensing-type clothes dryer includes a plurality of condensing ducts provided in a middle portion of a circulation duct, the condensing ducts condensing air being circulated there-through after being discharged from a drum; and a plurality of cooling fins provided to be in contact with an outer surface of the condensing ducts, wherein an interval or a pitch of the cooling fins is different partially according to a flow rate of air blown from a cooling fan for a heat-exchange with air flowing through the condensing duct. At this time, the pitch or interval of the cooling fins is narrow at a portion where air blown from the cooling fan flows fast, and the pitch or internal of the cooling fins is wide at a portion where air blown from the cooling fan flows slowly.

Abstract: Providing a multi-tube heat exchanger capable of increasing heat exchanging performance without increasing its heat transmitting area and solving a problem on drop in heat exchanging efficiency due to adhering pollutant or the like. A multi-tube heat exchanger comprising an inner tube (heat transmitting tube) group in which a first fluid passes and an outer tube (body) in which a second fluid passes, both ends of each multiple heat transmitting tubes being held and disposed on introduction/discharge side holding plates located on each of first fluid introduction side and first fluid discharge side. The heat transmitting tube is constituted of only a heat transmitting tube main body 114 and a number of lump-like projections are formed at a predetermined interval in the length direction on one or both of opposing wall faces on longer sides of the heat transmitting tube main body 114.

Abstract: A heat dissipating assembly (1) includes a plurality of fins (10), three heat pipes (20), and a base (30). Each fin defines three through holes (11) across a middle portion thereof. A plurality of dome-shaped protruding portions (14) is formed in each fin. The protruding portions are arranged in a regular array of offset rows. Adjacent protruding portions in any row protrude from front and rear faces of the fin in a regular alternating configuration. One end of each heat pipe is respectively inserted into the corresponding through holes of the fins, and an opposite end of each heat pipe is attached in the base. The base is attached on an electronic device, for absorbing heat produced by the electronic device. The protruding portions increase a heat dissipating surface area of the fins, and deflect airflow that passes across the fins in a direction parallel to the fins.

Abstract: The invention provides a charge air cooler, especially for motor vehicles, having a finned-tube block. The finned-tube block includes flat tubes through which charge air can flow and at least one fin member attached to the flat tubes. At least one fin member includes rows of webs and web crosspieces, the rows offset relative to each other by a predetermined distance. At least one web and/or one web crosspiece possesses at least one vortex generator.

Abstract: A wrought aluminum sheet product having a textured surface for improved heat transfer properties. A plurality of textured features having dimensions of about 1-50 microns is roll textured onto one or both sides of the sheet. The aluminum sheet may be used as the fins or tubing of a heat exchanger.

Abstract: An EGR cooler including a flat box shell having an inlet for introducing cooling water and an outlet for discharging the cooling water, plates positioned at axial open ends of the shell to close the axial open ends thereof, hoods positioned at sides of the plates away from the shell to enclose end faces of the plates, tubes extending within the shell and having ends penetrating through the plates, the tubes for passing exhaust gas from one hood to the other for thermal exchange with the cooling water, guide plates curved away from the axial extension of the shell toward longer sides of the end face of the shell and provided in the hood on an inlet side of the exhaust gas, a bar positioned between the guide plates and extending in a direction of shorter sides of the end face of the shell for dividing a stream of the exhaust gas.

Abstract: The present invention discloses an improved heat transfer tube, an improved method of formation, and an improved use of such heat transfer tube. The present invention discloses a boiling tube for a refrigerant evaporator that provides at least one dual cavity nucleate boiling site. The present invention further discloses an improved refrigerant evaporator including at least one such boiling tube, and the method of making such a boiling tube.

Abstract: A heat exchanger/heater comprising a tubular member having a fluid inlet end, a fluid outlet end and plurality of pins secured to the interior wall of the tube. Various embodiments additionally comprise a blocking member disposed concentrically inside the pins, such as a core plug or a baffle array. Also disclosed is a vapor generator employing an internally pinned tube, and a fluid-heater/heat-exchanger utilizing an outer jacket tube and fluid-side baffle elements, as well as methods for heating a fluid using an internally pinned tube.

Abstract: A heat transfer tube for a falling film type evaporator, in which water spreading characteristics, particularly the water spreading characteristics in the tube axis direction, enhancing the heat transfer ability. Three types of projections 2, 3, and 4 are formed on an external surface 1a of a heat transfer tube body 1. A respective plurality of projections 2 to 4 are arranged spirally in parallel to one another, forming projection groups 2a to 4a. The number of each projection group 2 to 4 is one. Pitches P2 to P4 for the projections 2 to 4 are in the range of 0.35 mm≦P4<P3<P2≦5.95 mm. Heights h2 to h4 of the projections 2 to 4 are in the range of 0.1 mm≦h4<h3<h2≦0.5 mm. Pitches for the projection groups 2a to 4a is in the range of 0.72 to 1.12 mm.

Abstract: A cooling system is provided with a heat exchanger that has a thermally conductive tube over-molded with a plurality of thermally conductive fins. To form the heat exchanger, a thermally conductive tube is provided. Insert molding, over molding or injection molding is utilized to incorporate thermally conductive fins with the thermally conductive tubes. The molding process may also simultaneously create any required features, such as mounting features and fittings for tubing to be connected to the heat exchanger.

Abstract: A cylindrical pipe which is excellent in heat transfer characteristic and has no accumulation of liquid, wherein a flat-shaped portion (2) along the pipe axis (L) is formed inside the cylindrical pipe (1) formed in corrugated shape. As a method for manufacturing said pipe, the present invention provides a pipe manufacturing method, wherein a thin-wall blank cylindrical pipe (P) is fed in increments of a prescribed distance, while being rotated at a definite speed, a roller die (85) being pressed against the outer periphery of the cylindrical pipe, the roller die being advanced and retracted in accordance with the feed of the cylindrical pipe, for forming a spiral corrugation such that the groove depth thereof is gradually increased, starting from the flat portion of the cylindrical pipe, and reaches a maximum in the portion opposed to the flat one.

Abstract: A hydrogen storage and release apparatus is provided with a heat exchanging portion provided with hydrogen storage alloy containers, a heat exchanger body in which the heat exchanging portion is received so that a heat gas or coolant is introduced and discharged, and a hydrogen-travelling passage connected to the containers so that hydrogen can move to the containers. The heat exchanging portion is provided so that the heat exchanging efficiency on the heat gas discharge side of the heat exchanging portion is made higher than that on the heat gas introduction side thereof.

Abstract: The invention relates to a method of fabricating a pyrometallurgical reactor cooling element with flow channels. In order to enhance heat transfer capability, the wall surface area of the flow channel, which is traditionally round in cross-section, is increased without increasing the diameter or length of the channel.

Abstract: A liquid heating apparatus includes: a liquid bath; a combustion chamber provided with a burner, and formed at one side on a lower portion of the liquid bath; and an exhaust pipe located horizontally in the liquid bath and extending from one side of the liquid bath toward the other side thereof. The apparatus heats the liquid bath by passing combustion gas generated in the combustion chamber into the exhaust pipe, with the exhaust pipe being formed into a cylinder shape having vertical side walls. A fin is integrally located on an inner surface of the side wall of the exhaust pipe along the longitudinal direction thereof. The fin has a predetermined heating surface chosen in accordance with a predetermined temperature gradient in a longitudinal direction of the exhaust pipe, and is located on only upper portion side on an inner surface of the exhaust pipe.

Abstract: A heat exchanger and manufacturing method thereof, include a plurality of radiating pins which are aligned at a predetermined interval and a plurality of refrigerant tubes which are positioned to be penetrated among the radiating pins and through which refrigerant passes. In addition, the refrigerant tubes are mutually connected by the connection pipes, inflow/discharge pipes are respectively connected with the refrigerant tubes of one side, and connection portions of the refrigerant tubes and connection pipes and connection portions of the inflow/discharge pipes and the refrigerant tubes are simultaneously joined by a melting processing. Accordingly, the heat exchanger can reduce a manufacturing process and cost, by simultaneously joining a connection portion of the refrigerant tubes and connection pipes and connection portion of the inflow pipe and discharge pipe, by a melting processing.

Abstract: The present invention relates to an arrangement for introducing black liquor into a furnace of a recovery boiler, said arrangement comprising an elongated tube having an interior surface and an exterior surface, through which tube the black liquor being fed into the furnace is supplied, whereby the black liquor is taken into contact with said interior surface prior to being sprayed into the furnace. The interior surface of said elongated tube is provided with heat transfer elements and surfaces, such as fins or grooves. The heat transfer element or surface increases the heat conductivity between the tube and the black liquor above the conductivity achieved with a normal tube passage.

Abstract: The invention relates to a heat-exchanger tube structured on both sides with excellent heat transfer characteristics utilizing both outer and also inner fins and secondary grooves intersecting the inner fins. Two spaced-apart rolling tools are provided in the utilized device in order to form the outer fins of two adjacent rolling tools; the inner structure is formed by two differently profiled mandrels. The first mandrel forms in a first forming area the inner fins. The second mandrel forms in a second forming area the inventive secondary grooves into the earlier created inner fins.

Abstract: A heat transfer tube for a falling film type evaporator, in which water spreading characteristics, particularly the water spreading characteristics in the tube axis direction, enhancing the heat transfer ability. Three types of projections 2, 3, and 4 are formed on an external surface 1a of a heat transfer tube body 1. A respective plurality of projections 2 to 4 are arranged spirally in parallel to one another, forming projection groups 2a to 4a. The number of each projection group 2 to 4 is one. Pitches P2 to P4 for the projections 2 to 4 are in the range of 0.35 mm≦P4<P3<P2≦5.95 mm. Heights h2 to h4 of the projections 2 to 4 are in the range of 0.1 mm≦h4<h3<h2≦0.5 mm. Pitches for the projection groups 2a to 4a is in the range of 0.72 to 1.12 mm.

Abstract: This invention relates to a pipe (1) having several internal ribs (2, 3, 4) having a spiral twist, where the ribs run with rotational symmetry with the longitudinal axis (5) of symmetry of the pipe (1). This invention creates a heat transfer pipe that will be characterized by a much better heat transfer in comparison with the previously known pipes having internal ribs, and to this end it guarantees not only an increase in the internal heat transfer surface area but also an effective cross-flow between the inside wall surface of the pipe and the core flow near the longitudinal axis of symmetry. To that end, the free ends (2c, 3c, 4c) of the internal ribs (2, 3, 4) are a distance (a) from the longitudinal axis (5) of symmetry of the pipe (1), which is in the range of 1:12 to 1:3 in relation to the inside diameter (d) of the pipe; and all the internal ribs (2, 3, 4) run in the same direction (arrow 6) and with the same spiral length (L) with a spiral twist to the longitudinal axis (5) of symmetry.

Abstract: A regenerative circuit structure is built up by implementing the following steps in particular: an intermediate layer is made on a support core representing the inner profile of the structure; a series of channels regularly distributed around the core is made with the channels opening to face the intermediate layer, each of the channels being provided with a soluble insert; the support core is preheated and the body of the structure is made by thermal spraying under a vacuum; channels are machined in the body from the outside, and said channels are filled by means of soluble inserts; a closure layer is formed to close the channels in the body, and an outer envelope is formed by thermal spraying under a vacuum, after preheating; and all of the soluble inserts and the intermediate layer are eliminated.

Abstract: The invention relates to a flat tube of a heat exchanger in heating installations or of a radiator of a motor vehicle which is folded from a flat sheet metal of aluminum or an aluminum alloy and across the respective flow of which spacers or the flat sides of the flat tube brazed or soldered to one another are distributed, which are designed as dents of the flat sides of the flat tube on one or both sides. According to the invention it is provided that in the same flow in addition to the spacers embossments freely projecting into the flow are distributed as turbulence-generating flow obstacles at least at one flat side of the flat tube.

Abstract: The heat exchange tubes of the invention are provided with an inner wall having an increased surface area for contact with a fluid circulating through the tube for the greater exchange of heat energy between the circulating fluid and an external fluid. The outer wall of the heat exchange tube is provided with a series of radially outwardly extending members for increasing the heat exchange surface of the outer wall of the tube.

Abstract: The present invention relates to a heat exchanger in which a plate-shaped cooling medium flow portion (11) provides an internal cooling medium flow path inside by laminating two flat plates (13, 14) subjected to drawing and a cooling fin are alternately laminated, a cooling medium inlet (15) for allowing a cooling medium to flow into the cooling medium flow path and a cooling medium outlet (16) for allowing the cooling medium passing through the cooling medium flow path to flow out are formed in said two flat plates, and the cooling medium flowing from the cooling medium inlet to the cooling medium flow path is passed through said cooling medium flow path and is then allowed to flow out of the cooling medium outlet.

Abstract: The invention relates to heat-exchanger tubes structured on both inner and outer sides with excellent heat-transfer characteristics, which have recesses on the outside and ribs with specific dimensions on the inside. The structuring tools utilized for the various method modifications are adjusted in such a manner that they are not only able to create aligned, continuous grooves and non-aligned, spaced apart recesses but also secondary structures. The heat-exchanger tubes provided preferably with smooth end sections and smooth intermediate sections are utilized in particular in shell and tube heat-exchangers.

Abstract: The invention relates to a heat-transfer tube, in particular an evaporator tube, with fins circumferentially extending on the shellside, which fins are shaped to essentially closed-off channels. The channels are open to the outside through pores with at least two variable sizes. In order to improve the evaporation characteristics, the invention provides advantageous regions for the ratio of the pore sizes and the ratio of the number of pores.

Abstract: The invention relates to an air conditioner with a refrigerant loop containing a compressor, an evaporator, an accumulator positioned on the low-pressure side between the evaporator and the compressor, and an internal heat exchanger with a high-pressure side heat transfer channel and a low-pressure side heat transfer channel. According to the invention, the internal heat exchanger has a multichannel tube wound into a radial spiral or a meander shape. In addition or alternatively, the internal heat exchanger contains a multichannel tube which is positioned in the air current path of a cool air current of a high-pressure side condenser/gas cooler. Utilization, for example as a CO2 air conditioner in motor vehicles.

Abstract: The present invention provides an improved heat transfer surface. The improved heat transfer comprises: a surface covered with fin convolutions. The fin convolutions have fin tips extending from the surface. The fin tips have a first plurality of notches and a second plurality of notches wherein the first notches and the second notches are of different sizes.

Abstract: The invention provides a tube for use in furnaces where gas and liquid media are being passed through the tube from one end to the other while being subjected to substantial heating and decomposition resulting therefrom. The tube is made of a stainless iron-nickel-chromium-base alloy comprising in weight-% max 0.08% C, 23-27% Cr, 33-37% Ni, 1.3-1.8% Mn, 1.2-2% Si, 0.08-0.25% N, 0.01-0.15% rare earth metals, and Fe and usual impurities. The cylindrical tube has a smooth outer surface and an inner surface provided with valleys or recesses extending longitudinally with a smoothly curved bottom profile.

Abstract: To provide a high heat transfer performance with a heat transfer pipe used to a condenser and an evaporator in a refrigerating cycle using a refrigerant mixture, the heat transfer pipe includes main grooves and auxiliary grooves each formed on the inner surface of the heat transfer pipe with the main grooves intersecting the auxiliary grooves, wherein the main grooves are separate by ridges, and the ridges are divided into ribs by the auxiliary grooves, and wherein a length of the ribs formed along the direction of the main grooves is made longer than the length of the ridges, a width of the auxiliary grooves is made smaller than the length of the ribs and further the auxiliary grooves are formed in a direction where a pressure gradient in the heat transfer pipe is reduced.

Abstract: A steam generator of water-tubes type for burn fossil fuel where instead of the convective heat transfer of the present day boilers, the water-tubes are heated by means of the mechanism of heat conduction in solids. The water-tubes are embedded in a large piece of a metal or alloy of high thermal conductivity, to which the thermal energy of the combustion gas is transferred from a long horizontal tunnel. Besides, in contradistinction with the present boilers, the water-tubes are straight and of high thermal conductivity.

Abstract: A finned heat exchange tube includes a metal cylindrical central tube having an outer surface and a metal fin helically disposed on and in thermally conductive contact with the outer surface of the tube. The cross-section of the fin is trapezoidal in shape, with a longer and a shorter base, the longer base being in contact with the outer surface of the tube. Alternatively, the fin can have a cross-section substantially rectangular in shape, having rounded comers and sides of longer and shorter dimensions perpendicular to one another, a side of the shorter dimension being in contact with the outer surface of the tube. A process for forming a heat exchanger tube comprises helically winding and securing a metal fin on an outer surface of a metal cylindrical central tube. The fin, which is in thermally conductive contact with the central tube, has a cross-section that can be trapezoidal or substantially rectangular in shape.

Abstract: Tube plate structure of a micro-multi channel heat exchanger including a lower header having a hollow for receiving refrigerant, an upper header having a shape the same with the lower header placed over, and opposite to the lower header, a plurality of tube plates arranged in a length direction of the upper and lower headers at fixed intervals each having opposite ends fixed to the upper header and the lower header and a plurality of channels formed therein elongated to be in communication with the hollows of the two headers each with an area of a section parallel to a length direction of the two headers reduced at a fixed ratio as it goes from an air inlet side to an air outlet side, and a plurality of fins between the tube plates for heat exchange with the air, thereby permitting to utilize an entire heat exchanger more efficiently.

Abstract: A combustion heater includes a combustion chamber having a burner input port and a heat output port. A burner is coupled to the burner input port, whereby heat is generated within the combustion chamber. A heat exchanger is provided having an inlet and an outlet. The inlet is coupled to the heat output port of the combustion chamber. The heat exchanger consists of two hollow corrugated cones secured in base to base relation with opposed apexes. This form of heat exchanger is capable of withstanding high temperatures when directly coupled with the combustion chamber and serves to make any combustion heater with which it is coupled more efficient.

Abstract: The present invention provides an improved heat transfer surface. The improved heat transfer comprises: a surface covered with fin convolutions. The fin convolutions have fin tips extending from the surface. The fin tips have a first plurality of notches and a second plurality of notches wherein the first notches and the second notches are of different sizes.

Abstract: Disclosed is a condenser and especially a tube therefor which is particularly suited for use in condensers that operate at operating pressures of approximately 20 bar. The condenser is a flat-tube condenser having tubes of substantially flat cross section extending between header tubes and cooling fins supported on the flat surfaces of the tubes. The tubes have a substantially flat cross section and a plurality of flow channels disposed side by side. The flow channels are substantially circular and have a hydraulic diameter of from 1.10 mm to 1.30 mm. Tubes of flat cross section and circular flow channels disposed in series operate with a particular advantageous effect in serpentine condensers.

Abstract: A heat exchanger and method of assembly for an automotive vehicle includes at least one tube having an internal surface and an external surface, and a composition cladding having at least magnesium applied to the internal surface and external surface of the tube.

Abstract: The invention relates to a heat exchanger block having a row of heat exchanger walls (1f, 1g) which are arranged at a distance from one another and define intervening heat-exchange medium flow chambers (1c, 3) for a first and a second heat-exchange medium, and a plurality of spaced thermally conductive rods (2) which extend all the way through the row of heat exchanger walls (1f, 1g) and the intervening heat-exchange medium flow chambers (1c, 3). The heat exchanger walls are formed by flat-tube sections (1) which are arranged at a distance from one another in the direction of the row and the interiors (1c) of which form first heat-exchange medium flow chambers, and the flat-tube interspaces (3) of which form second heat-exchange medium flow chambers.

Abstract: An exhaust gas cooler for reducing the temperature of exhaust gases from internal combustion engines, comprising an external tube extending between two tube plates or end walls and defining a coolant chamber, coolant inlet and outlet means communicating with the coolant chamber, and a plurality of internal tubes extending between the end walls and arranged to carry the exhaust gas through the coolant chamber. The external tube has a cross-sectional shape which has a height (H) in the major axis which is greater than its width (W) in the minor axis perpendicular to the major axis, preferably oval, or comprising two semi-circles connected by common straight line tangents parallel to the major axis. Such a cross-sectional shape means that the exterior tube has a planar face which simplifies the fitting of mounting brackets and placement with an engine compartment.

Abstract: The present invention relates to a heat exchanger in which a plate-shaped cooling medium flow portion (11) provides an internal cooling medium flow path inside by laminating two flat plates (13, 14) subjected to drawing and a cooling fin are alternately laminated, a cooling medium inlet (15) for allowing a cooling medium to flow into the cooling medium flow path and a cooling medium outlet (16) for allowing the cooling medium passing through the cooling medium flow path to flow out are formed in said two flat plates, and the cooling medium flowing from the cooling medium inlet to the cooling medium flow path is passed through said cooling medium flow path and is then allowed to flow out of the cooling medium outlet.

Abstract: The present invention relates to a heat exchanger in which a plate-shaped cooling medium flow portion (11) provides an internal cooling medium flow path inside by laminating two flat plates (13, 14) subjected to drawing and a cooling fin are alternately laminated, a cooling medium inlet (15) for allowing a cooling medium to flow into the cooling medium flow path and a cooling medium outlet (16) for allowing the cooling medium passing through the cooling medium flow path to flow out are formed in said two flat plates, and the cooling medium flowing from the cooling medium inlet to the cooling medium flow path is passed through said cooling medium flow path and is then allowed to flow out of the cooling medium outlet.

Abstract: A refrigerant tube for heat exchangers is disclosed. The refrigerant tube has an outer diameter of not larger than 5.3 mm, with a plurality of internal spiral fins formed on the inner surface of the refrigerant tube. The refrigerant tube has a thickness of 0.16 mm˜0.2 mm. The internal spiral fins are set in their number to 40˜50, and each have a height of 0.15 mm˜0.18 mm, a projection angle of 38°˜42°, and a spiral angle of 6°˜20°. Due to the internal spiral fins in addition to the reduced outer diameter of the refrigerant tube, the tube reduces the production cost of heat exchangers and accomplishes the recent trend of compactness of the heat exchangers. The tube also has several advantages expected from small-diameter refrigerant tubes, such as a reduction in air-side pressure loss, and improves heat transfer efficiency of the heat exchangers. This refrigerant tube thus enhances the heat exchange operational performance of the heat exchangers.

Abstract: The invention relates to a heat-transfer tube, in particular an evaporator tube, with fins circumferentially extending on the shellside, which fins are shaped to essentially closed-off channels. The channels are open to the outside through pores with at least two variable sizes. In order to improve the evaporation characteristics, the invention provides advantageous regions for the ratio of the pore sizes and the ratio of the number of pores.