680results about "Ice removal" patented technology

A spacer device for incorporation into a bent-tube heat exchanger that includes a spine and a plurality of fingers that protrude from one side of the spine. The number of fingers in the spacer device is less than the number of tubes that are folded in a region to form the bent-tube heat exchanger. The plurality of fingers are configured to exert a force against the tubes and to provide and maintain a separation between the tubes in the folded region. A heat exchanger that includes the spacer device may also include a coating on the tubes in the folded region in order to reduce corrosion and increase the life-time of the heat exchanger. The method of forming the heat exchanger includes placing the spacer device between the tubes, such that the fingers lay on the tubes in the region to be folded and assist in the folding process.

The invention belongs to the technical field of closed cooling towers, and discloses a countercurrent closed cooling tower and a cooling method.The countercurrent closed cooling tower comprises a tower body, a draught fan is fixedly connected to the top of the tower body, an air inlet is formed in the side wall of the bottom of the tower body, a water collecting tank is formed in the bottom of the tower body, and a pair of coil pipes is fixedly connected to the middle of the tower body; through cooperation of structures such as an annular shell, an annular spraying pipe and a concave panel, the possibility that scale is generated by the coil pipe is reduced, the heat exchange effect can be improved, during heat exchange, water in a collecting groove of the annular spraying pipe moving in a reciprocating mode is pumped and pressurized, the surface of the coil pipe is scoured in an annular mode, and the scale forming risk is reduced; and meanwhile, the sliding columns continuously extrude the wave-shaped grooves, so that the whole annular shell rotates in a reciprocating mode, close-distance washing can be more uniform, and therefore the heat exchange effect and durability of the coil pipe are efficiently improved.

The present invention relates to a header tank provided in a heat exchanger having a two-row structure in which core parts are provided in two rows, and to a header tank having a structure in which a first tank is coupled to a header, and a second tank is coupled to be spaced apart from the first tank at a predetermined interval, such that condensate water condensed on surfaces of the core parts may be discharged between the first tank and the second tank, thereby satisfying all of pressure resistance of the header tank, temperature distribution of the core parts, and cooling performance of the heat exchanger.

A heat exchanger includes heat transfer tubes and a fin disposed between the heat transfer tubes. The fin includes a fin portion defining a flat surface and one or more heat transfer promoter groups including heat transfer promoters. The heat transfer promoters extend from one adjacent heat transfer tube to the other adjacent heat transfer tube and slope relative to the fin portion. The heat transfer promoters include a first heat transfer promoter disposed most upstream in the air flow direction. A first drain space is provided between the first heat transfer promoter and an air upstream part of the fin portion that is located closest to and upstream of the first heat transfer promoter in the air flow direction. A second drain space is provided between the heat transfer promoters that are adjacent. The first drain space has a larger area than the second drain space.

The peak closed type condensation cooler comprises a box body, and an air mixing chamber is arranged on the upper portion of an inner cavity of the box body; two connected fog dispersal modules are arranged in the box body, a resistance reducing shutter and a water distribution device are sequentially arranged between the fog dispersal modules and the side wall of the box body, and the two fog dispersal modules, the resistance reducing shutter and the water distribution device divide a lower cavity of the box body into a first cavity, a second cavity and a third cavity; the fog dispersal module is provided with a cold air channel and a hot air channel which communicate with the air mixing chamber. Through the structural design of bottom air inlet, the sufficient fresh air introduction area can be achieved on the premise that the height of equipment is not increased, then the air path resistance is reduced, the fan operation pressure head and energy consumption are reduced, and the overall energy-saving performance of the equipment is improved. Meanwhile, on the premise that the vertical size of the equipment is not increased, the lift requirement of the spraying water pump is reduced, the energy consumption and the operation burden of the water pump are reduced, and the operation economical efficiency and the structure compactness of the whole equipment are improved.

The invention discloses a multi-stage evaporative condenser and a condensing unit thereof, and belongs to the technical field of condensers, the multi-stage evaporative condenser comprises a condensing pipe, a condenser control box and a compressor are arranged on the condensing pipe, a steam circulating mechanism is arranged behind the condensing pipe, and a shunting partition plate is arranged in the end part of the condensing pipe. Through the arrangement of the upper through partition plate, the lower through partition plate and the two-way partition plate, low-temperature water flow and high-temperature steam can flow reversely, the scientific and effective heat exchange principle is followed, a low-temperature side inlet just meets low-temperature side steam, a high-temperature side outlet corresponds to a high-temperature side steam inlet, and the reasonable temperature difference and sufficient heat exchange in the whole process are guaranteed; meanwhile, due to the arrangement of the suction assembly and the suction base, tiny impurities in water flow can be deposited around the bottom through centrifugal force by means of the centrifugal impeller, then the collected high-concentration impurity water flow is automatically discharged out of the system through the negative pressure suction system below the elastic membrane ring, and formation of water scale is inhibited from the source.

The invention discloses a fin, a preparation method thereof and a heat exchanger, and relates to the technical field of heat exchange. The fin comprises a fin base body and a hydrophobic coating, wherein the surface of the fin base body is coated with the hydrophobic coating; the fin base body comprises a heat transfer section and a drainage section which are arranged in the first direction of the fin base body, and the drainage section is arranged close to the windward side of the fin base body. The heat transfer section is provided with a pipe hole for a heat exchange pipe to penetrate through, and the drainage section is provided with a drainage groove. The designed fins can improve the heat exchange efficiency of the heat exchanger and reduce frosting on one hand, and can prolong the service life of the heat exchanger and maintain the heat exchange efficiency of the heat exchanger at a high level for a long time on the other hand.

The utility model discloses a condensate separating mechanism for a shell-and-tube heat exchanger, which relates to the technical field of shell-and-tube heat exchange, and comprises a shell and a support arranged on the shell, and further comprises a heat inlet pipe arranged on the shell and fixedly connected with the shell; the flange is arranged on the shell and is fixedly connected with the shell; the heat pipe cavity is arranged in the shell; the heat flow pipe assembly is arranged in the shell; the distance fixing assembly is arranged on the shell; the heat outlet pipe is arranged on the shell and is fixedly connected with the shell; the cold inlet pipe is arranged on the shell and is fixedly connected with the shell; the cold outlet pipe is arranged on the shell and is fixedly connected with the shell; by arranging the filtering assembly, solid impurities in condensate can be effectively removed through the condensate separating mechanism in the heat exchange process, the condensate is repeatedly used, and the use cost is greatly reduced.

The disclosure relates to the field of ventilation systems, specifically to ventilation systems in residential and non-residential (commercial) buildings. Specifically, the invention relates to decentralized supply and extract units with waste heat recovery and can be used for transmitting heat and power from an extraction air flow, i.e. from a flow of air extracted from a building, to a supply air flow, i.e. a flow of fresh air being drawn into a building, for the purpose of replacing spent air from the building.

The invention relates to the technical field of heat exchangers, and discloses a shell-and-tube condenser capable of automatically removing a liquid film, which comprises a shell, one end of the shell is provided with a cold water inlet, the other end of the shell is provided with a cold water outlet, the upper end of the shell is provided with an air inlet, and the lower end of the shell is connected with a liquid outlet pipe; a plurality of air uniformizing holes are formed in the air uniformizing cover, the air uniformizing cover divides an inner cavity of the shell into a first cavity body and a second cavity body, a second finned tube is arranged in the first cavity body, a first finned tube is arranged in the second cavity body, and liquid guide fins are arranged on the outer wall of the first finned tube. The finned tube I is arranged, and the liquid guide fins are additionally arranged on the finned tube I, so that the continuity of a liquid film is actively destroyed, the liquid film does not accumulate and grow outside the tube, but accumulates in the liquid guide fins to drop in a liquid drop form, and the problem of thermal resistance caused by liquid film coverage is effectively solved; and the heat transfer efficiency of the whole equipment is obviously improved.

The utility model discloses a low-temperature evaporation waste heat recycling device, relates to the technical field of waste heat recycling, and solves the problems that when high-temperature and low-humidity air of a hot-air blower is conveyed to a steam tube nest through a tray, as the air entering the tray is scattered, the air conveyed to the steam tube nest is not uniform, and the temperature of the steam tube nest is low. The device comprises a high-temperature clean water tank, a circulating water tank, a water distributor, a water source hot water machine, a waste heat absorption heat exchanger, a condensate water tank, a hot water circulating pump and a sewage circulating pump, a support is fixedly installed on the circulating water tank, and two lifting push rods are fixedly arranged on the support; the top ends of the two lifting push rods are fixedly connected with a tray, a guide mechanism is arranged in the tray, a cylinder is fixedly installed on the support, and a steam tube nest is arranged in the cylinder. According to the utility model, hot air entering the tray can be uniformly guided to the steam tube nest, so that the heat exchange effect is improved.

The invention relates to a micro-channel heat exchanger with a flow stabilizing structure and a working method, and belongs to the technical field of heat exchangers. The device comprises a cover plate, a box body and splitter plates, a water inlet and a water outlet are formed in the cover plate, the splitter plates are arranged in the box body at intervals, a micro-channel is formed between every two adjacent splitter plates, a converging-in cavity and a converging-out cavity are formed in the box body, progressive flow stabilizing structures are symmetrically arranged on the inner wall faces of the two sides of each micro-channel, and each progressive flow stabilizing structure comprises a base body and a plurality of protruding parts. The base body is provided with a bottom face attached to the splitter plate, the multiple protruding parts are arranged at intervals in the length direction of the base body, each protruding part is provided with a slope contour and a top arc contour, and the slope contours are lifted to the top arc contours in the direction from the afflux cavity to the afflux cavity. According to the invention, coolant backflow can be prevented, pressure fluctuation can be reduced, the working stability of the radiator can be improved, eddy current can be avoided to the greatest extent, the bubble blocking phenomenon can be reduced, and the wall surface drying phenomenon can be delayed.

The utility model relates to the field of heat recovery devices, and discloses a heat recovery device of a tubular sterilization machine, which comprises a heat exchanger, hoses are sleeved on the surfaces of a refrigerant outlet and a refrigerant inlet, and a first limiting lantern ring and a second limiting lantern ring are fixedly sleeved on the outer side of the heat exchanger. The top end of the first limiting lantern ring and the bottom end of the second limiting lantern ring are fixedly connected with first fixing assemblies correspondingly, the bottom end of the first limiting lantern ring and the top end of the second limiting lantern ring are fixedly connected with second fixing covers with grooves correspondingly, and each second fixing cover is connected with a screw in a threaded penetrating mode in the vertical direction. The bottom end of the screw rod is rotationally connected with fixing plates in sliding contact with the inner wall of the groove of the second fixing cover, a second fixing rubber pad is fixedly arranged at the end, away from the screw rod, of each fixing plate, and water absorption sponge is fixedly arranged at the end, close to the heat exchanger, of the inner wall of the groove of each second fixing cover. And meanwhile, the port can be effectively prevented from being polluted.

The application provides a data center cooling tower automatic deicing device, and relates to the technical field of cooling towers. The device comprises: an air heat exchange system connected with a data center machine room and a data center cooling tower, used for guiding the heat of the data center machine room to the data center cooling tower for ice prevention and deicing, and guiding the cold obtained by the data center cooling tower for ice prevention and deicing to the data center machine room for cooling; and a detection control system comprising: a temperature sensor, at least comprising a first temperature sensor, installed outside the air inlet side of the data center cooling tower, used for monitoring the outdoor temperature of the air inlet side of the data center cooling tower, a data center dynamic ring system connected with the first temperature sensor and the air heat exchange system, used for starting the air heat exchange system according to the outdoor temperature of the air inlet side of the data center cooling tower, so as to realize the ice prevention and deicing of the data center cooling tower and the cooling of the data center machine room. The application can balance the deicing efficiency and energy consumption control.

The invention relates to the technical field of flue gas waste heat recovery, in particular to a direct contact type flue gas waste heat recovery device based on multistage spraying, which comprises a heat recovery barrel and a bottom sealing plate, a flue gas injection mechanism and a medium heat exchange mechanism are fixedly arranged in the heat recovery barrel, and the upper part of a flue gas injection threaded pipe is communicated with a gas injection pipe through a flue gas buffer box; the upper side face of the heat recovery cylinder communicates with a purification and condensation mechanism, the purification and condensation mechanism comprises a purification box, a purification box bottom cover is arranged at the bottom of the purification box, an activated carbon layer is fixedly arranged on the purification box bottom cover, and a condensation drainage pipe is connected to the purification box bottom cover. The contact area between the smoke injection threaded pipe and the medium capillary tube can be increased, then heat in the smoke injection mechanism can be better transferred into the heat recovery cylinder in a heat transfer mode, waste heat of smoke is used for fully heating a medium in the medium capillary tube, and the resource utilization rate and the conversion efficiency are improved.

A fin structure (100) is applied to a microchannel heat exchanger, the fin structure (100) having flat tube grooves (10) drilled therein, flat tubes inserted into the flat tube grooves (10), a medium flows through the flat tubes, and the flat tubes cooperate with the fin structure (100) to absorb or release heat from the air. The fin structure (100) includes a plurality of inclined segments (20), each extending from one end to the other of the fin structure (100), and the inclined segments (20) are connected head to tail to form a wave shape, and each inclined segment (20) has an inclined surface (21) on both opposite sides.

The invention discloses a solid heat storage boiler, and relates to the technical field of ocean sampling, the solid heat storage boiler comprises a heat insulation box, a partition plate is arranged in the heat insulation box, the partition plate divides the interior of the heat insulation box into a heat storage bin and a heat exchange bin, an air duct is arranged in the heat storage bin, a heat storage brick is arranged in the heat storage bin, and a heating wire is arranged in the heat storage brick. A plurality of sets of heat exchange pipes are arranged in the heat storage bin, the circulating motor injects water into the heat exchange pipes, the electromagnetic valve close to one side of the water inlet tank is closed after injection is completed, the heat storage bin and the heat exchange bin are arranged in the heat storage bin, an air duct opening is formed between the heat storage bin and the heat exchange bin, a frame body is arranged in the heat exchange bin, and heat exchange pipes are arranged at the end of the frame body. According to the solid boiler, heat exchange is conducted on water in the heat exchange pipe through the air duct, the heated water flows into the water outlet tank to be temporarily stored and used, and therefore the purpose that hot water service is continuously provided without a water storage tank can be achieved, and the occupied area of the solid boiler is reduced.

The invention discloses an evaporator structure which comprises two side plates and evaporator coils installed on the two side plates and further comprises bearings, inner rings of the bearings are fixed to straight pipe sections of the evaporator coils, fan blades are fixed to the circumferential outer side faces of outer rings of the bearings, and soft brush strips are connected to the axial ends of the outer rings of the bearings. The soft brush strips make contact with the circumferential outer side faces of the corresponding straight pipe sections. The evaporator coil pipe has the function of sweeping off condensate water on the straight pipe section of the evaporator coil pipe, so that the frosting problem caused by excessive accumulation of the condensate water can be effectively prevented.

The invention relates to a heat exchanger structure capable of improving heat exchange efficiency, which comprises a support, a lower seal head, a lower tube plate, a barrel, an upper tube plate and an upper seal head, a plurality of shell pass medium outlet tubes are arranged above the barrel, and an effluent collecting ring mechanism is arranged on the inner sides of the plurality of shell pass medium outlet tubes; the outlet water collecting ring mechanism comprises a bottom ring plate, a first vertical ring plate and a plurality of first rib plates, a plurality of shell pass medium inlet pipes are arranged below the barrel body, the inner sides of the shell pass medium inlet pipes are provided with the inlet water distributing ring mechanism, and the inlet water distributing ring mechanism comprises a top ring plate, a second vertical ring plate, a plurality of partition plates and a plurality of second rib plates. A plurality of water outlets are formed in the bottom of the second vertical annular plate, a water inlet buffer space is defined by the top annular plate, the barrel, the second vertical annular plate and the lower pipe plate, the water inlet buffer space is divided into a plurality of areas through the partition plates, each area is communicated with one shell pass medium inlet pipe, and therefore the heat exchange efficiency is greatly improved.

The invention relates to the technical field of air conditioners, and discloses a variable frequency air conditioner peculiar smell prevention control method, air conditioner equipment and a storage medium, solves the problems that the refrigeration effect is delayed and the equipment is easy to trigger freezing protection shutdown in an existing peculiar smell prevention scheme, and gives consideration to the peculiar smell prevention effect, the user refrigeration experience and the equipment operation stability. The scheme can be summarized as follows: after the air conditioner is started, peculiar smell prevention control is triggered only in a refrigeration mode, the fan is not started temporarily in the initial stage, and the swing blades are automatically adjusted to guide air upwards; and after the preset temperature condition or the running duration threshold value of the compressor is met, the inner fan is started and runs at the breeze gear. Meanwhile, the frequency of a compressor is self-adaptively adjusted according to the outdoor environment temperature, the temperature of an evaporator coil is periodically detected, and the low air gear is switched after the temperature reaches the standard; and after the gear is maintained for a preset duration, the peculiar smell prevention control is stopped, and the air conditioner air speed and the swing blade position are restored to the user set state.

This invention provides an apparatus for heat exchange comprising a plurality of fins, and a heat transfer coil in the form of a plurality of oblong sectional tubes being arranged in a single array. The fins are arranged along a longitudinal portion of the oblong sectional tubes substantially perpendicularly for guiding incoming convective fluid towards all the oblong sectional tubes for heat exchange to be performed thereupon. Furthermore, the oblong sectional tubes of the heat transfer coil each has a substantially rectangular cross-section with round edges, or oval or elliptical cross-section, and are operable to be installed with a tilt angle for them to be tilted with a major axis of the oblong sectional tube being in respect to a direction of the incoming convective fluid flowing through the heat transfer coil. A related system and method involving the apparatus are further described.

The application provides an air conditioner self-cleaning control method with a humidifying function and a cabinet air conditioner, and belongs to the field of air conditioners. The air conditioner can realize a single lower air outlet heating mode with air entering from an upper air outlet and air exiting from a lower air outlet, can realize a single upper air outlet cooling mode with air entering from the lower air outlet and air exiting from the upper air outlet, and can realize a self-cleaning mode with air circulating in the air conditioner. In the self-cleaning mode, the temperature of an indoor heat exchanger is controlled to make the air in the air conditioner frost in the air duct and then defrost, so that the self-cleaning effect of the air duct and the fan blade in the air conditioner is realized.

The utility model relates to the technical field of heat exchangers, in particular to an exhaust and liquid discharge type heat exchanger which comprises a heat exchanger body, an exhaust pipe communicating with the top of the heat exchanger body and a liquid drainage pipe communicating with the bottom of the heat exchanger body, the exhaust pipe communicates with a liquid level pipe, and a floating block is slidably arranged in the liquid level pipe; a gap allowing air to pass through exists between the floating block and the liquid level pipe, a pressure sensor is fixedly arranged on the liquid level pipe, a controller is fixedly arranged on the heat exchanger body, the pressure sensor is electrically connected with the controller, a first opening and closing assembly is arranged on the exhaust pipe, a second opening and closing assembly is arranged on the drainage pipe, and the first opening and closing assembly is electrically connected with the controller. When the floating block abuts against the pressure sensor, the exhaust pipe is closed, and when the lyophobic pipe is opened, the exhaust pipe is opened. The automatic exhaust and drainage device has the effect of achieving automatic exhaust and drainage.

A heat exchanger (10) includes a plurality of flat tubes (20) and one or more fins (30). The flat tubes (20) are arranged in a first direction. The fin (30) is joined to the flat tubes (20). The heat exchanger (10) causes heat exchange between a refrigerant that flows inside the flat tubes (20) and air that flows outside the flat tubes (20) along a second direction that intersects the first direction. The fin (30) includes a first joint portion (32) and a first plate portion (33). The first joint portion (32) is joined to a first flat tube (20a). The first plate portion (33) is positioned between an air flow downstream end (30b) and the first joint portion (32). The first plate portion (33) is formed with a first protruding portion (133) for causing water to flow in the first direction in a vicinity of the first flat tube (20a).

The application relates to the technical field of compressed air energy storage, and discloses a PCHE heat exchanger, a gas-liquid separation method and a water draining method. The PCHE heat exchanger provided by the application is provided with multiple turning sections, the density difference of gas-liquid two-phase medium is utilized, a centrifugal force field is constructed in the turning process, when compressed air flows through the turning sections, the condensate water and the gas phase are separated by centrifugal force and attached to the wall surface, an independent steam-water separation device does not need to be additionally arranged or a complex separation component does not need to be additionally arranged in the heat exchanger, compared with the scheme in the prior art in which the heat exchange and the separation function are independent and the synergy is poor, the heat exchange efficiency is guaranteed, the compactness of the structure is effectively improved, and the equipment floor area is significantly reduced.

The application discloses a condensation heat exchange reinforcing structure for a spacecraft humidity control system water collecting inlet and a preparation method thereof. The condensation heat exchange reinforcing structure comprises a metal sheet base and a metal wire mesh. A single needle fin array is formed on the surface of the metal sheet base. The single needle fin has a circular arc top. The metal wire mesh is formed by interweaving warp and weft threads and is fixed at multiple points on the outside of the single needle fin array. The metal wire mesh is in contact with the top and side wall of each single needle fin. The condensation heat exchange reinforcing structure is fixed at the end of an air side channel and the water collecting inlet area. A water collecting cavity with a suction hole is arranged below the water collecting inlet area. The single needle fin array-wire mesh structure promotes the nucleation and coalescence of liquid droplets and directs them to the suction hole and the water collecting cavity. Meanwhile, the single needle fin array increases the effective heat exchange area, strengthens the turbulence and improves the condensation heat exchange performance.

The utility model discloses warehouse dehumidifying and cooling equipment, which relates to the technical field of tobacco leaf storage and comprises a shell mechanism, a dust removal mechanism is arranged on the side surface of the shell mechanism, an air cooling fan is arranged on the top surface of an inner bottom plate of the shell mechanism, and a dehumidifying mechanism is arranged on the left part of the inner wall of the shell mechanism. And a cooling mechanism is arranged at the right part of the inner wall of the shell mechanism. The dust removal mechanism is arranged to adsorb dust in the warehouse, the dust is prevented from falling on the surfaces of tobacco leaves, the tobacco leaves are prevented from being polluted, and the quality of the tobacco leaves is reduced. The dust on the surfaces of the tobacco leaves can be sucked into the dust collection hopper from the through holes in the surface of the dust collection hopper by suction airflow generated by the fan only by starting the fan when the dust collection hopper needs to be used. Then the dust passes through a second connecting pipe and falls into a dust collecting box, then a filter in the dust collecting box is started, the filter discharges the dust and airflow generated by a fan out of the device through an air outlet, and then the dust is separated into a dust collecting drawer.

The utility model discloses an integrated heat exchanger suitable for frozen drying machine, including the casing, the casing is equipped with the outlet of drying gas, the inlet of water gas, the coolant outlet and the coolant inlet from top to bottom, the upper portion is equipped with the heat exchanger in the casing, still be equipped with the evaporimeter in the casing, still be equipped with the gas liquid separation chamber of gas in the bottom of casing, the evaporimeter is located heat exchanger below and communicates with the heat medium outlet of heat exchanger, the backflow channel of gas is established between evaporimeter and heat exchanger and the inside of casing, and the gas outlet of evaporimeter and the cold medium inlet of heat exchanger communicate with backflow channel. The utility model divides and sets up the upper and lower end in the casing with heat exchange and evaporation function, can simplify the structure setting in the casing, and the production cost is simplified, after setting evaporimeter below heat exchanger, can realize the step -by -step cooling of airflow from top to bottom, is favorable to the gathering of condensate in the bottom of casing and gas -water separation in the cooling process, thereby guaranteeing the drying effect of gas.

The invention relates to the technical field of condensers, and discloses a parallel arrangement type energy-saving condenser for a synthesis kettle and a method, the parallel arrangement type energy-saving condenser comprises a shell, a heat exchange pipe and an air inlet, the heat exchange pipe and the air inlet are arranged in the shell, the air inlet is fixedly communicated with one side of the shell, and the end, away from the air inlet, of the shell is fixedly communicated with a water inlet and a water outlet; the interior of the shell is fixedly connected with a ventilation cover, and an acceleration assembly is arranged in the ventilation cover; through cooperative use of a heat exchange pipe and an acceleration assembly, a water source in the heat exchange pipe enters a fixed disc through a flowing pipe, the water source drives a rotating rod to rotate through a rotating blade, the rotating rod drives an L-shaped plate to rotate through a cam, a first spring deforms when the L-shaped plate rotates, and when the cam does not make contact with the L-shaped plate any more, the first spring deforms when the cam makes contact with the L-shaped plate; and the first spring quickly recovers to the initial state and generates vibration, the vibration is transmitted to the heat exchange tube, and the condensate on the surface of the heat exchange tube flows through the vibration, so that the effect of accelerating flowing is achieved.

This heat exchanger is provided with: a plurality of flat tube groups each composed of a plurality of flat tubes that are disposed upright in the vertical direction and are provided in parallel at intervals in a direction orthogonal to an air flow direction, the flat tube groups being disposed at intervals in the air flow direction; corrugated fins that are disposed between the plurality of flat tubes of each of the plurality of flat tube groups; and a pair of headers that are disposed above and below each of the plurality of flat tube groups. A refrigerant inlet is formed in one of the pair of headers on the most windward side when the heat exchanger is functioning as an evaporator, and a temperature difference forming structure is provided between the most windward flat tube group and the second most windward flat tube group.