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: 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: Heat exchanger (30), comprising a thermopositive core part (31) and thermopositive heat transfer elements (32), which are wires, bristles, fibers, strips or equivalent, preferably copper wires or carbon fibers. The heat transfer wires are squeezed between tubes or rods twisted about each other.

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 heat exchanger includes a fin and tube assembly with increased heat transfer surface area positioned within a hollow chamber of a housing to provide effective heat transfer between a gas flowing within the hollow chamber and a fluid flowing in the fin and tube assembly. A fan is included to force a gas, such as air, to flow through the hollow chamber and through the fin and tube assembly. The fin and tube assembly comprises fluid conduits to direct the fluid through the heat exchanger, to prevent mixing with the gas, and to provide a heat transfer surface or pathway between the fluid and the gas. A heat transfer element is provided in the fin and tube assembly to provide extended heat transfer surfaces for the fluid conduits. The heat transfer element is corrugated to form fins between alternating ridges and grooves that define flow channels for directing the gas flow.

Abstract: Laminated metal structure includes a radially outer component and a radially inner component concentrically interconnected with each other. The radially outer component has a porosity of at least 80% and the radially inner component is a radially impermeable strength element such as a metal foil. The metal structure can be used in a continuous ambulant peritoneal dialysis treatment for anchoring a catheter in the human body.

Abstract: The present invention utilizes extended surfaces, such as studs and fins, on a low-flux surface area of radiant heat transfer tubes in a fired furnace to more uniformly distribute heat flux. The invention increases the overall heat transfer of the tube by increasing heat flux rate for the backside of the tube, for example, and thus decreases the temperature differential between the opposing tube sides.

Abstract: In a cooling device boiling and condensing refrigerant, a heat conductor portion for thermally connecting a heat reception wall and a heat radiation wall defining a closed container is disposed in the closed container, a heat-generating member is attached on the heat reception wall, and a heat radiation fin for radiating heat generated from the heat-generating member to an outside is provided on the heat radiation wall. In the cooling device, both ends of the tube are connected to the closed container at different position of the heat radiation wall to communicate with the closed container, so that the heat radiation fin is enclosed by the heat radiation wall and the tube.

Abstract: A fin-tube heat exchanger with a vortex generator is disclosed. The heat exchanger includes at least one heat transfer tube extending therethrough. A vortex generator is formed on the fin and includes a plurality of protuberance ribs projected from the fin and centralized with the heat transfer tube. An air flow inlet is defined between adjacent two of the protuberance ribs and an air flow outlet is defined between other adjacent two of the protuberance ribs. The air flow is guided from the air flow inlet, through channels defined between the vortex generator and the at least one heat transfer tube, and passes out of the air flow outlet, thereby speeding the air flow and promoting the heat transfer efficiency of a stagnation area behind the tube, and generating vortexes at the protuberance ribs and the air flow outlet for draining outer air into the surface for better air mixing and promoting the heat transfer efficiency of the fin.

Abstract: The invention relates to a tube for a heat exchanger, consisting of a metal strip having an inner face and an outer face, this strip having two extremities which are folded locally towards the inner face of the tube so as to form two borders (28, 30) placed one beside the other. Passages (38) are formed in at least one of the extremities of the metal strip for introduction of a brazing flux. These passages (38) can be formed in the two extremities of the metal strip, and offset with respect to one another. The passages extend over a distance greater than the height of the borders (28, 30) in such a way as to form an inlet (40) for the brazing flux.

Abstract: In fabricating a heat sink from a blank comprising a base plate portion, and a fin-forming portion to be cut and provided on at least one side of the base plate portion by cutting the fin-forming portion to a raised form to make a plurality of fins, an object of the invention is to reduce the likelihood of producing burrs which are difficult to remove when the base plate portion is drilled while assuring the base plate portion of suitable machinability to render the heat sink less costly to manufacture. In a heat sink 1 having a plurality of fins 3 and fabricated from a blank 11 comprising a base plate portion 12, and a fin-forming portion 13 to be cut and provided on at least one side of the base plate portion 12 by cutting the fin-forming portion 13 to a raised form to make the fins 3, the above object can be fulfilled by using as the heat sink blank 11 an aluminum or aluminum alloy extrudate having a Vickers hardness of 40 to 65.

Abstract: A heat exchanger with small-diameter refrigerant tubes is disclosed. The heat exchanger has a plurality of air guide fins assembled with each other by one or more vertical rows of refrigerant tubes passing through the air guide fins. In the heat exchanger, each of the refrigerant tubes is a small-diameter tube having an outer diameter of not larger than 6 mm. In addition, four rows of offset surfaces are vertically formed on each of the air guide fins at a position between two tubes of each vertical row of refrigerant tubes through a pressing process such that the four rows of offset surfaces are arranged along a transverse direction of the fin. Four rows of vertical slits are each formed by two air guide openings defined between opposite side edges of each of the offset surfaces and the land surface of the air guide fin.

Abstract: An internal grooved tube according to the present invention comprises a large number of fine spiral grooves on the inside surface in parallel arrangement, wherein the grooves are formed to assure that the ratio of a groove width in the tube axial direction to a groove height is in the range of 1 to 2. A lead angle &thgr; of the grooves to the tube axis is preferably limited to 26 to 35 degrees. A method of manufacturing an internal grooved tube according to the present invention comprises the steps of inserting a grooved plug into a blank tube rotatably, and then pressing the blank tube against the outside surface of the grooved tube with several balls revolving both around the circumference of the blank tube and on its axis in a location of the grooved plug inserted, while drawing out the blank tube longitudinally in one direction, wherein the number of balls is limited to 2 to 3.

Abstract: A passive first-order band reject, or notch, filter characteristic is introduced into a supply and/or return line (18, 20) of a heat transfer system (12) that uses electrically conductive liquid heat transfer medium in contact with radio frequency electrified components (14) typical in sputtering or etching manufacturing equipment. The heat transfer medium line (20) is coiled to create an inherent inductance (L2). A capacitive element (C2) is operatively connected across the coil (29) in the heat transfer medium line (20), the amount of capacitance chosen so that the resonant frequency is at the RF frequency of the components (14) being thermally conditioned. Thus, a high impedance is created for that frequency. The coil (29) and capacitor (C2) combination is protected from physical and electromagnetic interference by an enclosure (44).

Abstract: A method for manufacturing a fin for a heat exchanger includes the steps of forming an intermediate pre-formed plate, which has adjacent zigzag strips, by passing a flat plate material between a pair of first processing rollers, and forming a fin by passing the intermediate pre-formed plate between a pair of second processing rollers to bend the zigzag strips at a portion connecting adjacent zigzag strips. The fin includes a plurality of waving strips arranged adjacent to each other in the transverse direction, which are offset in the longitudinal direction. The adjacent waving strips are connected only between the flat portions of the waving strips at a connection length less than or equal to a plate thickness. The fin may be manufactured readily and inexpensively. A heat exchanger using the fin as an inner or outer fin may exhibit superior performance.

Abstract: An improved fin array for use in a heat transfer assembly, such as a condenser for a vehicle air conditioning system, and a method of making the improved fin array, are disclosed. The fin array comprises an elongated one-piece fin member having top and bottom base portions with fin sets extending between adjacent top and bottom base portions. The top and bottom base portions are generally flat for bonding to the heat exchanger tubes, such as by brazing. Each fin set includes a plurality of individual fins extending generally perpendicularly to a longitudinal length of the fin member and having side edges that are longitudinally offset with respect to each other. The offset fin edges provide increased air flow over the individual fins and thus increase the efficiency of the overall heat exchanger. The fins may also be slightly bowed to accommodate for variation in the tolerances of the adjacent tubes.

Abstract: A new type of segmented fin 12 for use on a finned tube 18, the unique type of finned tube 18 that is created with the new type of segmented fin 12, specialized serrating wheels 14 and 16 for creating the new type of segmented fin 12, and the process 10 for employing the specialized serrating wheels 14 and 16 to create the new type of segmented fin 12. Each of the segments 26 of the new type of segmented fin 12 is permanently curved, and the segments 26 are coined to increase surface area of the segments 26 and to further shape the sheared edges 42 and 44 of the segments 26 into a more pointed configuration in order to make them more aerodynamic.

Abstract: A cathode ray tube includes a deflection unit (11) having a cooling fin (25) which is attached to the surface of a tapering surface on a yoke ring (23) by lugs (27). At least one of the lugs has a free end extending axially and outwardly in thermal contact with the tapering surface, and at least another of the lugs has a free end extending axially in an opposite direction and inwardly in thermal contact with the tapering surface.

Abstract: A heat exchanger tube having an internal surface that is configured to enhance the heat transfer performance of the tube. The internal enhancement has a plurality of polyhedrons extending from the inner wall of the tubing. The polyhedrons have first and second planar faces disposed substantially parallel to the polyhedral axis. The polyhedrons have third and fourth faces disposed at an angle oblique to the longitudinal axis of the tube. The resulting surface increases the internal surface area of the tube and the turbulence characteristics of the surface, and thus, increases the heat transfer performance of the tube.

Abstract: A core unit of a heat exchanger is composed of a plurality of parallel flat tubes, a plurality of corrugated fins, a support member disposed between two of the corrugated fins and an electric heater disposed inside the support member. The support member has a pair of parallel plates bonded to the corrugated fins at the summits of corrugation of the corrugated fins. The electric heater is composed of a heating element and an insulation member inserted between the heating element and the parallel plates.

Abstract: A heat exchanger tube for a falling film evaporator has fins provided on the outer periphery of the tube body and extending in a direction transverse or in oblique to the axial direction of the tube. The fins have heights in a range of 0.2 to 0.8 mm. The fins are arranged in a density to have 905 to 1102 in number of fins per 1 m in the axial direction. Grooves formed in the tip end of the fins and extending substantially along the fins, the mutually opposing inner peripheral wall surface of the groove defining an angle within a range of 70° to 150°. Cut-outs formed in the tip end of the fins, the cut-outs being provided at a pitch in a range of 0.5 to 1.0 mm. With this construction, the heat exchanger tube for the falling film evaporator which exhibits a high refrigerant wetting and spreading ability as well as large surface area for providing remarkably improved heat transmission performance.

Abstract: A heat transfer tube (10) for use in an application, such as a shell and tube type air conditioning system condenser, in which a fluid flowing through the heat exchanger external to the tubes condenses by transfer of heat to a cooling fluid flowing through the tubes. The tube has at least one fin convolution (20) extending helically around its external surface (13). A pattern of notches (30) extends at an oblique angle (&agr;) across the fin convolutions at intervals about the circumference of the tube. There is a spike (22) between each pair of adjacent notches. The fin convolution, notches and spikes are formed in the tube by rolling the wall of the tube between a mandrel and, first, a gang of finning disks (63) and, second, a notching wheel (66). Because, during the manufacture of the tube, of the interaction of the rotating and advancing tube and the notching wheel, the angle (&bgr;) of inclination of the axis of the tip of the spike is oblique with respect to the notch angle.

Abstract: A heat exchanger (10) including a heat exchanger conduit and fins arranged on the conduit tubes (12, 12') to further heat transfer between the external fluid flowing over the fins (22, 22') and the fluid flowing within the conduit. The fins (22, 22') include a row of apertures through which tubes (12, 12') of the heat exchanger conduit extend. The leading (4, 6) and trailing (48) edges of the fins (22, 22') are contoured to substantially conform to isotherms around the circulating fluid flowing within the tubes (12, 12'). To achieve this edge configuration while also allowing for a dense packing of fins and tubes in a multi-row heat exchanger, the leading and trailing edges are wave-shaped such that adjacent fins can interfit together.

Abstract: An arrangement for a heat exchange surface in a boiling application that retains particulate material between fins to provide nucleate boiling sites. The heat exchange surface most typically is part of a heat exchange tube and retains the particulate material by transversely extending the tops of the fins. The fins and extended tops form channels with a restricted opening at the top of the channel that prevents passage of the particulate material out of the channel. The surface may be formed on the inside or outside of tubes.

Abstract: A counterflow evaporator for refrigerants, in particular for zeotropic refrigerants, where elongated inner members are inserted in the elongated tubular members of the evaporator to form an annular passage through which the refrigerant can flow. Resilient support members maintain the elongated inner members in position within the elongated tubular members.

Abstract: A heat exchanger composed by overlapping a plurality of heat exchanger units each of which is formed by inserting a plurality of fins over one or a plurality of heat transfer tubes. The fins are worked so that a pair of opposed fins of the overlapped heat exchanger units are brought into contact with each other at one or more points. This heat exchanger constitutes an air conditioner when the heat exchanger units are overlapped in a direction of gravity.

Abstract: A fin type heat exchanger includes a plurality of plate shaped fins disposed in spaced parallel relationship to define air channels therebetween for conducting an air flow from an air inlet side to an air exhaust side of each fin. A bent pipe extends through pipe holes formed in the fins for conducting a heat exchange fluid. Groups of slits are formed in each fin, whereby there is a first row of slit groups adjacent the air intake side, and a second row of slit groups adjacent the air exhaust side. There are more slits in the first row than in the second row. The slits in the first row have a width greater than the width of the slits disposed in the second row.

Abstract: A heat exchanger comprises a tube 11 and fin plates 12 attached to the outer surface of the tube. Each fin plate 12 is in the form of a strip sheet which is wider than the diameter of the tube 11, and each fin plate 12 is fitted on the tube 11 and has a semicylindrical recess 20 in the form corresponding to the cylindrical shape of the tube 11. Flat fins 21 extend from both sides of the semicylindrical recess 20. Cut pieces 22a are formed each by a U-shaped cut 22 at a predetermined pitch in the longitudinal direction of the semicylindrical recess 20, and each cut piece is erected outwardly of the semicylindrical recess to thereby form an upstanding fin 23, which is formed on a first fin plate element 18 as well as a second fin plate element 19. Straight tube portion 15 of the tube 11 is fitted between the semicylindrical recesses 20 of the first fin plate element 18 and the second fin plate element 19. In this way, the tube and the fin plate 12 are secured.

Abstract: The invention relates to hydroaerodynamics and to thermal physics and concerns devices to control the boundary and near wall layers in the flows of continuos media such as gases, liquids, their two-phase or multicomponent mixtures and the like, moving along ducts under no pressure or under pressure.

Abstract: Clearance holding portions for holding a clearance between the adjacent plate fins are spaced from side edges of louvers by a predetermined distance in a direction perpendicular to a flowing direction of air and disposed at an upstream side of tubes in the flowing direction of the air. In this way, air flowing between the adjacent plate fins flows through the louvers without being disturbed by the clearance holding portions, so that an effect of the louvers for improving the heat exchange performance can be maintained sufficiently.

Abstract: A flat heat exchanger fin includes a body having arrays of louver groups formed therein. Each array includes four louver groups. The first and second louver groups are disposed over a respective pipe, with the second louver group disposed behind the first louver group. The third and fourth louver groups are disposed beneath a respective pipe, with the fourth louver group disposed behind the third louver group. Each louver group includes a plurality of louvers which form slits through the body. The slits extend transversely relative to the air flow direction and generally radially with respect to the respective pipe. Each louver group includes a proximate edge facing a respective pipe, and a remote edge facing away from the pipe. The remote edge is spaced from the respective pipe by a substantially constant separation distance. Dew-draining ridges are formed in the fin above, below, in front of, and behind respective pipes.

Abstract: A heat exchanger for an air conditioner comprises a plurality of heat-transfer tubes arranged in parallel to each other at predetermined intervals, and heat-transfer fins formed by helically winding a plurality of fine wires around the plurality of heat-transfer tubes. Preferably, the heat-transfer tubes are divided into groups of two adjacent heat-transfer tubes (1a, 1b), (1b, 1c), (1c, 1d), . . . , and at least one fine wire fin is wound helically around the two adjacent heat-transfer tubes of each group so that the fine wire fin does not cross other portions of the fine wire fin as viewed along a direction perpendicular to a plane including the axes of the plurality of heat-transfer tubes. When fabricating the heat exchanger, at least either the outer circumferences of the heat-transfer tubes or the outer circumferences of the fine wires are coated with a metal film formed by plating, and then the heat-transfer tubes and the fine wires are interlaced to form a heat exchanging structure.

Abstract: To provide a heat transfer tube for an absorber in which the quantity of residence of an absorbing liquid on the surface of the tube staying in trough portions is large, and the staying absorbing liquid is thinly and widely spread on the surface of the tube to materially promote an absorbing performance. On an outer surface of a metal tube having an outer diameter of D, a group of N (N is a natural number) number of trough portions, wherein the length L1 in a longitudinal direction of the tube is 70 mm.ltoreq.L1.ltoreq.130 mm, and the depth H is 0.23 mm.ltoreq.H<0.5 mm, is formed on a circumference of a circle formed in section of the tube in the case of being cut perpendicular to a longitudinal direction of the tube so that the pitch P (=.pi. D/N) is set in the range of 6.2 to 8.

Abstract: A heat exchange tube useful as a reactor tube for producing ethylene and highly improved in heat transfer efficiency has fins formed on the inner surface of wall of the tube in one or a plurality of regions or all regions arranged from an inlet end of the tube to an outlet end thereof axially of the tube. The fins are positioned in a direction intersecting the axis of the tube and have a suitable pitch. The fins are formed by a projection helically extending on the tube wall inner surface around the axis or are each in the form of an annular projection circumferentially extending on the inner surface in a direction intersecting the axis at right angles therewith. The pitch of the fins, the angle of intersection of the fins with the axis and the height of the fins are suitably determined in conformity with the inside diameter of the tube.

Abstract: A fluid-circulation heat exchanger including a porous body, made of thermally conductive material, in contact with at least one portion of a part to be cooled. The fluid flows through this porous body. The porous body has pores which generate directional changes of the fluid. These pores are large enough for the head loss of the fluid to be as small as possible on passage through the porous body. Application, in particular, to electron tubes.

Abstract: A heat exchanger includes parallel flat fins spaced apart to conduct an air current therebetween. Heat transfer pipes for conducting refrigerant pass perpendicularly through the fins in a zigzag pattern. Each fin includes grilles in the form of slits which are oriented generally radially relative to respective heat transfer pipes for disturbing the air current passing around the outer peripheries of the pipes. Ridges are formed in each fin in front of and behind each pipe to increase the heat transfer area to increase the heat transfer area of the fin and strengthen the fin against bending forces.

Abstract: The present invention relates to a heat exchanger of an air conditioner having a plurality of flat fins, each arranged in parallel at a predetermined interval to allow fluid to flow thereamong and a plurality of heat transfer pipes insertedly arranged in perpendicular patterns to the plurality of the flat fins to allow the fluid to internally flow, the heat exchanger comprising a plurality of louvered grid groups symmetrically opened in a forward and a reverse flowing direction of air current and radially disposed to encompass an upper and a lower side of the heat transfer pipes, so that the air current flowing though the plurality of flat fins can become turbulent and mixed around the heat transfer pipes to thereby reduce a cavitation region generating at the back of the plurality of heat transfer pipes and concurrently to increase a heat transfer efficiency, the heat exchanger further having an advantage in that a bead part is bent toward an inner side of the flat fin so as to be centrally and perpendicular

Abstract: A modular heat exchanger for a fluid flow is provided. The modular heat exchanger includes a plurality of modules formed from a heat transfer material. Each module has a generally rectangular cross section and a through bore extending longitudinally therethrough between parallel opposite faces. Each face includes a plurality of parallel fins extending fully across the face in a direction transverse to the longitudinal axis of the through bore. The fins have a generally saw tooth structure so as to increase the turbulence of the air flow through the heat exchanger.

Abstract: A heat exchanger fin includes a combination of a flat section, a wavy section, and a slit section arranged successively in a first direction, in order to compensate for different velocities of air passing across those sections, respectively, in a second direction transversely of the first direction, and thereby provide a uniform heat exchange rate across the fin.

Abstract: A heat exchanger includes parallel fins and heat transfer pipes extending through the fins for conducting a heat transfer fluid. Each fin includes four groups of slit-forming grilles disposed between each vertically spaced pair of pipes. The first and third groups are disposed below a first pipe of the pair, and the second and fourth groups are disposed above a second pipe of the pair. The third group is disposed behind the first group, and the fourth group is disposed behind the second group, considered with reference to a direction of fluid flow. An intermediate slit-forming grille is located behind the first and second groups and in front of the third and fourth groups. The grilles of each of the first and second groups project from the fin by respective heights which become progressively greater in the direction of fluid flow.

Abstract: The present invention relates to a heat exchanger for air conditioners having a plurality of a slit type grilles in each flat fin and making the air currents passing by the fin become turbulent flows and mixing the air currents together, to thereby improve the heat exchanging efficiency and reducing a cavitation zone formed in the back of each heat transfer pipe.

Abstract: A finned tube heat exchanger is disclosed in which the structure thereof is simple, and the heat exchanging performance is increased. The heat exchanger has a plurality of fin plates spaced at regular intervals and arranged in parallel with one another, and a plurality of heat exchanger tubes extending through the fin plates and including a refrigerant fluid therein. Each of the fin plates has a plurality of strips projected from the surface thereof, and the strips include first to fifth rows of strips arranged between openings, which are disposed adjacent to one another, in a parallel relationship. The first row of strips is located near a leading edge of the fin plates and formed of two louverlike strips in a form of a trapezoid having a long side located on the upper stream of the air flow. Each of the second to fourth rows of strips is formed of one bridgelike strip in a form of a rectangle.

Abstract: A fin for a radiator for cooling a fluid, the fin being made from a thin sheet of heat-conductive metal. The fin has many stacked fin elements formed from a single sheet. While the typical radiator fin is formed in a serpentine shape with rounded edges, the fin of the present invention is formed so it has flat edges. This facilitates the attachment of the fin to the tubes and also increases the minimum spacing between the cross-elements of the fin so that the fin is less apt to plug up in addition to being stronger as a result of a large flat bonding area against the tubes.

Abstract: A novel heat transfer apparatus and method including a body of carbon/carbon material with cooling tubes brazed therein. The carbon/carbon material includes carbon, graphite, carbon fibers, graphite fibers and combinations of the same and silicon carbide and boron carbide. The cooling tubes are prepared from stainless steel, nickel and its alloys, cobalt and its alloys, copper, molybdenum, molybdenum rhenium alloy, and carbon. A wetting agent is applied to the carbon surfaces to protect the carbon surfaces from attack by the molten brazing material and is selected from molybdenum niobium, tantalum, tungsten, and carbides of these refractory metals. The brazing material is selected from copper, copper alloys, silver, and gold.

Abstract: A heat exchanger includes parallel fins mounted on heat-transfer pipes which project through the fins. Each fin includes groups of slits disposed between the pipes. Each group includes an upper tier of slits, and a lower tier of slits located below the upper tier. Each tier includes four slits arranged in a radiant (radial) relationship with respect to a respective pipe. Each slit has a cross section which becomes larger in a direction away from the respective pipe.

Abstract: The present invention has the object of increasing the heat exchanging performance of heat transfer tubes having grooved inner surfaces. In order to achieve this object, the heat transfer tubes having grooved inner surfaces according to the present invention have fins which are formed consecutively in a circumferential direction on the inner surface of a metallic tube. The inner surface of the metallic tube is divided into regions R1.about.R4 in the circumferential direction. The inclination angle .alpha. with respect to the axis of the heat transfer tube of the fins 2 in odd-numbered regions when counting from one of the regions is 10.degree..about.25.degree., and the inclination angle .beta. with respect to the axis of the heat transfer tube of the fins 2 in even-numbered regions when counting from the region is -10.degree..about.-25.degree.. The pitch of the fins 2 is 0.3.about.0.4 mm, the height of the fins from the inner circumferential surface of the metallic tube is 0.15.about.0.

Abstract: A cooling apparatus for use in a cooling system is disclosed. The cooling apparatus comprises an evaporator having a conductive pipe which is wound spirally, and a blowing device for blowing air toward the evaporator. A plurality of fins for heat exchange are disposed on the outer surface of the conductive pipe. The blowing device has a blowing motor, a fan being rotated by the blowing motor, and a fan moving device for reciprocating the fan along the blowing direction during the rotation of the fan. Since the cool air generated from the evaporator moves with being rotated by the spirally wound conductive pipe, the air flow becomes complex and thus the heat exchange efficiency becomes high. Also, since the fan is reciprocated along the blowing direction, the blowing power is varied repeatedly and the heat exchange efficiency becomes even higher.

Abstract: In a heat exchanger comprising a number of multilayered fins, and a refrigerant pipe arranged in the meandering form in the fins, and an air conditioner having the heat exchanger, each of the fins has a corrugated portion formed in an air-flow direction thereon, which has at least two wavelike portions for producing a turbulent flow of air having such strength that a temperature boundary layer of the air is broken, but resistance against to the air flow is not excessively high. Each wavelike portion may be designed to have a triangular section or a trapezoidal section, and a flat portion may be disposed between the wavelike portions.

Abstract: A fin tube heat exchanger includes a plurality of fin plates spaced at regular intervals in parallel with one another and adapted to allow air to flow therebetween, each fin plate having a plurality of through-holes in at least one row in a longitudinal direction of the fin plates, a plurality of refrigerant tubes inserted into the through-holes of the fin plates in a perpendicular direction and a plurality of raised strips formed in a plurality of rows in a direction perpendicular to an air flow. The raised strips in the same row are raised from a fin base in a direction opposite to the direction in which the raised strips in adjacent rows are raised. The fin base and each of the raised strips define therebetween two openings open against the air flow. Rising portions on the refrigerant tube side of the raised strips in one row near to a center line of the through-holes are formed along a circular arc which has an identical center with the refrigerant tube.