Abstract: A cooling apparatus for cooling a waterflow is provided. Cooling apparatus includes a first evaporative cooler adapted to cool the waterflow therethrough, a second evaporative cooler adapted to receive and cool the waterflow from the first evaporative cooler therethrough, wherein the second evaporative cooler is adapted to receive an airflow therethrough to cool the waterflow therethrough and the first evaporative cooler is adapted to receive the airflow therethrough from the second evaporative cooler to cool the waterflow therethrough, and a deflector adapted to deflect the waterflow from the first evaporative cooler to the second evaporative cooler and allow the airflow from the second evaporative cooler to the first evaporative cooler therethrough. A cooling method for cooling a waterflow is also provided.

Abstract: A water-cooling type battery cooling system and a cooling method using the same are provided. The water-cooling type battery cooling system cools a battery using an air conditioner system. The air conditioner system includes a refrigerant circuit to improve control of cooling discharge temperature provided therein.

Abstract: A method of conditioning wastewater includes flowing wastewater into and through a first fluid tube and flowing a heat transfer fluid into and through a second fluid tube. The heat transfer fluid entering the second fluid tube has a different temperature than the wastewater entering the first fluid tube. The first fluid tube and said second fluid tube are positioned within a first casing that is surrounded by insulation. The first casing and the insulation are positioned within a second casing. The wastewater in said first fluid tube and said heat transfer fluid in said second fluid tube are arranged to allow heat transfer between the wastewater in said first fluid tube and the heat transfer fluid in said second fluid tube.

Abstract: A cylinder head is disclosed herein to allow for temperature control of exhaust gases exiting from an associated exhaust manifold. The cylinder head includes a combustion section that defines a plurality of combustion chambers and an exhaust manifold coupled to the combustion section. The combustion section fluidly couples to exhaust inlets defined by the exhaust manifold. The exhaust manifold includes at least one exhaust passageway in fluid communication with the exhaust inlets and in fluid communication with an exhaust outlet to receive combustion gases from the combustion section and output the same via the exhaust outlet. The exhaust manifold further includes at least one coolant passageway that at least partially surrounds the at least one exhaust passageway to pass coolant therethrough in order to draw and reject heat from exhaust gases.

Abstract: A continuous flow reactor includes a shell, wherein the shell is provided with a shell pass inlet and a shell pass outlet which are communicated with an inner cavity of the shell, tube plates and communication devices are connected to upper and lower ends of the shell, a reaction tube bank is arranged in the shell and includes a plurality of reaction tubes, upper and lower ends of each reaction tube are fixedly connected to the tube plates in a penetrating manner, and all the reaction tubes are sequentially communicated in series through the communication devices.

Abstract: The present invention provides an air conditioning system for a vehicle, which includes an evaporator mounted in a cold air passageway and a condenser mounted in a warm air passageway inside an air-conditioning case to perform cooling and heating, and protecting means for surrounding a plurality of electronic units mounted on the outer surfaces of the air-conditioning case and blowers, thereby preventing breakdowns and malfunctions by preventing foreign matters or water from entering into the electronic units.

Abstract: An air conditioner for a vehicle includes a blower motor and a blower control unit integrated so that terminals therebetween can be easily connected and a PCB is closely fixed to a flange with stronger power. The air conditioner includes: a blower unit having a blower motor driving a blower wheel to blow wind to the inside of an air-conditioning case; a blower control unit controlling the blower motor to control rotation of the blower wheel; a flange on which the blower motor is fixed and to which a PCB of the blower control unit is joined to one side of the blower motor; a first terminal associated with the blower motor; and a second terminal associated with the PCB and which is combined with the first terminal, wherein the blower control unit and the blower motor are formed integrally to the blower unit.

Abstract: A condensation and falling film evaporation hybrid heat exchanger is provided, including a shell, a condenser entrance pipe connected to a compressor discharge port, and an evaporator exit pipe connected to a compressor suction port being disposed respectively on the shell. A baffle plate is disposed at a position inside the shell corresponding to the condenser entrance pipe. A refrigerant distributor is disposed in the shell, a condensing tube bundle being disposed above the refrigerant distributor, and a falling film evaporating tube bundle being disposed below the refrigerant distributor. The condensation and falling film evaporation hybrid heat exchanger according to this invention can be used in concert with low-pressure refrigerant, thus efficiently solving the problem of refrigerant distribution with the falling film evaporator using low-pressure refrigerant.

Abstract: An air conditioning system includes a plurality of indoor units installed in the same indoor space, an outdoor unit and a control device. The indoor units include respective usage-side heat exchangers capable of setting set temperatures individually. The outdoor unit includes a heat-source-side heat exchanger conducting heat exchange with refrigerant circulating through the usage-side heat exchangers. The control device calculates a representative temperature related value shared by the indoor units using the set temperatures of the indoor units, and switches the indoor units between thermo-ON and thermo-OFF based on the representative temperature related value. The control device calculates the representative temperature related value based on a plurality of temperature differences between the set temperatures and control temperatures in the indoor units.

Abstract: A heat exchanger for an internal combustion engine includes a first flow channel; a second flow channel arranged adjacent to the first flow channel; a line separate from the second flow channel; and a valve channel in which an adjustable valve element is disposed. The valve channel is arranged upstream of the first and second flow channels and an inlet channel is arranged upstream of the valve channel in a flow direction of exhaust gas. The valve element includes a baffle plate, the baffle plate having an end portion that extends diagonally in the valve channel with respect to the flow axis of the first flow channel. The valve element includes a flap that is pivotably mounted at the end portion of the baffle plate such that the flap is pivotable about an axis that extends in a direction of a width of a common housing.

Abstract: An air conditioning system that includes a casing that has a flow channel connected to an inside of a vehicle to supply or discharge air. A motor is mounted on one side of the casing to generate a normal direction torque and a reverse direction torque and a first fan is disposed on one side of the flow channel to be connected to an output shaft of the motor and to be rotated. A second fan is disposed on one side of the first fan to be fixedly mounted in the shaft and to be rotated. Additionally, a variable connecting unit that connects the first fan to the shaft of the motor is rotated when the motor is rotated in a normal direction and has a torque of the shaft of the motor not to be transmitted to the first fan when the motor is rotated in a reverse direction.

Abstract: A system for use in image reproduction, the system includes at least a first light emitting unit and a second light emitting unit. The first light emitting unit includes a first cooling means arranged for cooling the first light emitting unit. The second light emitting unit includes a second cooling means arranged for cooling the second light emitting unit independently of the first light emitting unit. The first light emitting unit has a first elongate emitting area. The second light emitting unit has a second elongate emitting area. A control unit controls the cooling of at least one of the first cooling means and the second cooling means such that at least one of the first elongate emitting area and the second elongate emitting area, respectively, has a desired length.

Abstract: Embodiments for a charge air cooler are provided. In one example, an engine method comprises increasing intake air flow velocity through a charge air cooler in response to an estimated condensation formation value within the charge air cooler. In this way, condensation accumulation within the charge air cooler may be prevented.

Abstract: An exhaust heat recovery apparatus may include a bypass valve that is rotatably provided on a bypass path through which a high-temperature exhaust gas passes to open or close the bypass path, a heat exchanger that is communicatively connected to the bypass path to allow heat exchange to be performed between the high-temperature exhaust gas supplied from the bypass path and a low-temperature coolant introduced through a coolant inlet when the bypass path is closed, a valve actuator including a rod moved up and down by expansion or contraction of a wax sealed therein, and a connection part that converts an up and down motion of the rod into a rotary motion to allow the bypass valve to open or close the bypass path along with movement of the rod.

Abstract: A radial-flow plate heat exchanger (5) embedded in the catalytic bed of an isothermal chemical reactor (1) has heat exchange plates (10) comprising fluid passages (13) between a first metal sheet (20) and a second metal sheet (21) joined by perimeter weld seams (23) on a first surface (A) of the plate, a feeding channel (14) and a collecting channel (15) for the heat exchange fluid are formed with suitable metal sheets which are seam welded (25) directly to the opposite surface (B) of the plate, this structure allows the manufacturing of the plate (10) with an automated seam welding process, such as laser beam welding.

Abstract: A heat exchanger including a tubular core case, a pair of end plates for closing opposite ends of the core case, and a plurality of heat exchange tubes supported at opposite ends thereof by the end plates and allowing flow of a first heating medium inside thereof. One end plate is disposed on an upstream side of the first heating medium as an upstream end plate while the other end plates is disposed on a downstream side of the first heating medium as a downstream end plate. The downstream end plate comprises a downstream bottom surface part for supporting downstream end parts of the heat exchange tubes, and a downstream wall part formed integrally with and rising from a peripheral edge of the downstream bottom surface part, and a top end part of the downstream wall part is oriented toward upstream of the flow of the first heating medium.

Abstract: The present invention relates to a heat exchanger, a method for manufacturing the same, a heat recovery ventilator (HRV) including the same, and a method for defrosting and checking operations thereof.

Abstract: A system for conveying air from one location to another includes a soft duct having a passage and an air flow control device. The air flow control device can be operated to vary a cross sectional area of a portion of the passage of the soft duct.

Abstract: A heat exchanger for the air supply circuit of a motor vehicle engine includes a heat exchange core and at least one header tank. The heat exchanger also includes an air flow rate control valve arranged in the header tank of the exchanger, and the control valve is a valve that includes a body with three openings and a moving rotary member inside the body so as to control the circulation of air through the heat exchange core and/or through a duct bypassing the heat exchange core according to a law defined as a function of the angular position of the rotary member in the body.

Abstract: A method for high temperature sterilization of an emulsion, in particular a dermocosmetic preparation. The method comprises the steps of gradually pre-heating, performing ultra-high temperature sterilization and gradually cooling the emulsion. The emulsion is heated up to a pre-heating temperature, which is the temperature of the emulsion at the stability limit. Ultra-high temperature sterilization is performed by infusion of the pre-heated emulsion by heating the emulsion up to a sterilization temperature, maintaining the emulsion at the sterilization temperature, and cooling the emulsion under a vacuum at an end-of-sterilization temperature. The emulsion is gradually cooled with agitation to a storage temperature.

Abstract: An air diffuser having a single air inlet has air outlets straddling a wall of a structure to distribute air to two or more rooms of the structure. The air diffuser includes an adjustable baffle that selectively directs air toward the first and second rooms. The air diffuser includes an acoustic dampener that prevents sound from moving through the air diffuser from one room to the next.

Abstract: A heat exchanger (5) includes a housing (31), which contains a tube (32) and has a jacket (33), which surrounds the tube (32) while forming a ring channel (34). A primary inlet (35) and a primary outlet (36) are connected to one another fluidically via a primary path (37) carrying a primary medium through ring channel (34) and via a bypass path (38) carrying the primary medium through the tube (32). A control device (39) controls the flow of the primary medium through the primary path (37) and the bypass path (38). A secondary inlet (42) and a secondary outlet (43) are connected to one another fluidically via at least two secondary paths (44) for carrying a secondary medium. The primary path (37) is coupled with the secondary paths (44) in a heat-transferring manner with the media separated from one another.

Abstract: A heat exchanger (5) includes a housing (31), which contains a tube (32) and has a jacket (33), which surrounds the tube (32) while forming a ring channel (34). A primary inlet (35) and a primary outlet (36) are fluidically connected with one another via a primary path (37) carrying a primary medium through the ring channel (34) and via a bypass path (38) carrying the primary medium through the tube (32). A control (39) controls the flow of the primary medium through the primary path (37) and through the bypass path (38). At least two secondary inlets (42) and two secondary outlets (43) are fluidically connected with one another via at least two secondary paths (44) for carrying at least one secondary medium. The primary path (37) is coupled with the secondary paths (44) in a heat-transferring manner and such that the media are separated from one another.

Abstract: A heat exchange apparatus is provided and includes an external structure to support an airflow cooled computing device, first and second doors, each of which includes a heat transfer surface, sequentially coupled to the external structure downstream from the computing device, a water supply system fluidly coupled to a water supply and to the heat transfer surfaces of the first and second doors to thereby supply water to the heat transfer surfaces, first and second valves coupled to the water supply system for association with the first and second doors, respectively, and an exhaust system, disposed proximate to the external structure, configured to recycle the cooled airflow downstream from the first and second doors for repeated cooling of the computing device.

Abstract: An electronic device includes an enclosure and a first air guiding duct mounted in the enclosure. The first air guiding duct includes a first part and a second part. The first part defines a first air channel and a second air channel. The second part defines a third air channel communicating with the first air channel and a fourth air channel located at a side of the second air channel. A guiding wall is located in the second air channel and extends from the second air channel to the fourth air channel. When air flows from the first part to the second part of the first air guiding duct, air flows from the first air channel to the third channel to cool a first electronic component, and flows from the second air channel to the fourth air channel by the guiding wall to cool a second electronic component.

Abstract: A heat exchanger for cooling a liquid has an inlet and an outlet for a liquid to be cooled. A bypass is provided that bypasses the heat exchanger. A valve controls flow of liquid into the heat exchanger or into the bypass. The valve has a valve seat, a valve cone, and at least one spring made of a shape memory material. The at least one spring counteracts a liquid pressure existing in the inlet.

Abstract: A waste heat recovery system includes a heat recovery cycle system coupled to at least two separate heat sources having different temperatures. The heat recovery cycle system is coupled to a first heat source and at least one second heat source. The heat recovery cycle system is configured to circulate a working fluid. The at least one second heat source includes a lower temperature heat source than the first heat source. The working fluid is circulatable in heat exchange relationship through a first heat exchange unit, a second heat exchange unit for heating the working fluid in the heat recovery cycle system. The first heat exchange unit is coupled to the at least one second heat source to heat at least a portion of a cooled stream of working fluid to a substantially higher temperature.

Abstract: A forced fluid switch including a first plenum in communication with a first port; a second plenum in communication with a second port; a third plenum in switched communication with the first plenum and the second plenum and in communication with a third port; a fourth plenum in switched communication with the first plenum and the second plenum and in communication with a fourth port; and wherein the forced fluid switch has at least a first forced fluid path and a second forced fluid path, wherein in the first forced fluid path, the third plenum is in communication with the first plenum and the fourth plenum is in communication with the second plenum, and wherein in the second forced fluid path, the third plenum is in communication with the second plenum and the fourth plenum is in communication with the first plenum. A method is provided for switching forced fluid.

Abstract: A plasma processing apparatus and method to control a temperature of a chamber component therein. A process chamber may include a temperature controlled chamber component and at least one remote heat transfer fluid loop comprising a first heat exchanger having a primary side in fluid communication with a heat sink or heat source, and a local heat transfer fluid loop placing the chamber component in fluid communication with a secondary side of the first heat exchanger. The local loop may be of significantly smaller fluid volume than the remote loop(s) and circulated to provide thermal load of uniform temperature. Temperature control of heat transfer fluid in the local loop and temperature control of the chamber component may be implemented with a cascaded control algorithm.

Abstract: Method and apparatus for carrying out highly exothermic catalyzed reactions, like so-called oxidative reactions, in pseudo-isothermal conditions, for example the reaction for producing nitric acid and the reaction for producing formaldehyde.

Abstract: A low pressure system for cooling a ram bushing is provided. The low pressure system includes at least one check valve disposed on a T-coupling downstream of the low pressure pump. The check valve allows for the pressure to be maintained in the cooling system, but also allows pressure to be relieved in the event of an over pressure condition.

Abstract: A heat exchanger for an internal combustion engine includes a first flow channel; a second flow channel arranged adjacent to the first flow channel; a line separate from the second flow channel; and a valve channel in which an adjustable valve element is disposed. The valve channel is arranged upstream of the first and second flow channels and an inlet channel is arranged upstream of the valve channel in a flow direction of exhaust gas. The valve element includes a baffle plate, the baffle plate having an end portion that extends diagonally in the valve channel with respect to the flow axis of the first flow channel. The valve element includes a flap that is pivotably mounted at the end portion of the baffle plate such that the flap is pivotable about an axis that extends in a direction of a width of a common housing.

Abstract: An apparatus may include a first refrigerant tank, a second refrigerant tank, and first to fourth refrigerant lines. The first refrigerant tank may store a first refrigerant. The second refrigerant tank may store a second refrigerant. The first refrigerant line may be connected between the first refrigerant tank and a refrigerant passageway of a loading chuck to supply the first refrigerant to the refrigerant passageway. The second refrigerant line may be connected between the first refrigerant tank and the refrigerant passageway to return the first refrigerant to the first refrigerant tank. The third refrigerant line may be connected between the second refrigerant tank and the refrigerant passageway to supply the second refrigerant to the refrigerant passageway. The fourth refrigerant line may be connected between the second refrigerant tank and the refrigerant passageway to return the second refrigerant to the second refrigerant tank.

Abstract: A heat transmission unit includes a channel conducting a coolant, and a channel conducting a fluid to be cooled. The two channels are separated from each other by a wall provided with ribs extending therefrom into at least one of the two channels. The channel conducting the fluid to be cooled includes a fluid inlet and a fluid outlet. The channel is separated by a partition wall, arranged in flow direction, into a first and a second partial channel having a first partial inlet for fluid and a second partial inlet for fluid, and a first partial outlet for fluid and a second partial outlet for fluid. At least the first partial inlet for fluid is adapted to be shut off by a first shut-off device.

Abstract: A switchable exhaust gas heat exchanger includes an exhaust gas feed line and an exhaust gas discharge for an exhaust gas stream; a first exhaust gas passage and a second exhaust gas passage; a switching valve configured to switch the exhaust gas stream between the first and second exhaust gas passages; and a heat exchanger through which a coolant flows which is arranged in the first exhaust gas passage. The second exhaust gas passage routes the exhaust gas stream past the heat exchanger to the exhaust gas discharge. The switching valve is configured to be switched as a function of the temperature of the coolant and is a proportional control valve. A switching threshold and a switching limit of the coolant determine flow of the exhaust gas stream through the first and second exhaust gas passages.

Abstract: A thermal chamber and system for influencing the temperature of an IC chip under test including a thermal block that receives a chip socket, the thermal block adapted to be disposed between a docking interface plate and a workpress. The thermal block receives a flow of heated or cooled gas, and causes an IC chip to become heated or cooled prior to and during a test of the chip. The thermal chamber and system allows an IC chip to be testing under specific temperature conditions without using an expensive handler costing hundreds of thousands of dollars.

Abstract: A cooling apparatus includes a brine circuit through which brine flows, a pump disposed on the brine circuit, and a heat exchanger unit including a heat absorbing member and a heat radiating member. The heat absorbing member is in communication with the brine circuit. The heat absorbing member is capable of conducting heat generated from a cooling object to the brine for cooling the cooling object. The heat radiating member is in communication with the brine circuit and capable of receiving the heat from the brine. The brine circuit is configured such that the brine passes through the heat exchanger unit at a pressure equal to or lower than an atmospheric pressure.

Abstract: A subcool condenser having a condensation heat exchange portion, a receive portion and a supercool heat exchange portion is used as an outdoor heat exchanger that functions as a radiator in a cooling operation mode so that COP in the cooling operation mode is increased. In contrast, in a heating operation mode, a refrigerant bypass device that causes the refrigerant to flow so as to bypass the supercool heat exchange portion is provided so that pressure loss generated in the refrigerant flowing through the outdoor heat exchanger is decreased. Thereby, driving force of a compressor can be decreased and COP in the heating operation mode can be improved.

Abstract: A device may include a housing; a heat transfer region located in the housing and comprising a plurality of heat transfer tubes, the heat transfer tubes being distributed through an entirety of a cross-sectional area of at least a portion of the housing; a bypass duct that branches off from the housing at a location upstream of the heat transfer region, wherein an opening into the bypass duct is located in an outer wall of the housing; and an actuating element comprising a flap and a pivot shaft, the flap being pivotable about the pivot shaft.

Abstract: A heat storage device that includes a first heat storage material and a second heat storage material, both of which accumulate heat by heat exchange with a heat afferent medium, and a changeover device that selectively either performs or intercepts heat storage by the second heat storage material. Accordingly, if the absorption of heat by the first heat storage material has decreased, the changeover device changes flow of the second heat storage material so that heat may be extracted from the heat afferent medium by the second heat storage medium. Thus, when the heat afferent medium is a refrigerant, it is possible to supercool the refrigerant thereof. Furthermore, since heat is extracted from the heat afferent medium and is accumulated, accordingly it is possible to anticipate effective utilization thereof.

Abstract: A heat exchanger structure with flow divider includes a heat-conductive main body provided with a flow passage having at least one inner turn and one outer turn, and at least one flow divider located near and downstream the inner turn, such that a cooling liquid in the flow passage flowing through the inner and the outer turn to reach at the flow divider is divided by the flow divider into two smaller flows. Therefore, the cooling liquid in the flow passage has reduced pressure drop and it is not necessary to increase the operating power of a pump that delivers the cooling liquid into the flow passage.

Abstract: A representative mechanical draft system for drawing exhaust gasses from a chimney includes: an exhaust fan assembly having: a housing defining a chamber and having opposing openings, the opposing openings having a centerline extending therebetween, a first of the openings being operative to intake a flow of gasses, a second of the openings being operative to exhaust the flow of gasses from the chamber; and a centrifugal fan having a motor and an impeller, the motor being mounted external to the housing, the impeller being positioned within the chamber, a rotational axis of the impeller being inclined with respect to the centerline extending between the openings of the housing.

Abstract: A duct adapter system directs air flow relative to a hybrid water heater. The duct adapter system includes a collar adapted to surround a vent of a hybrid water shroud. The collar couples to standard duct pipe to extend ductwork to a heat pump portion of the hybrid water heater. A boost fan may be included in the system for boosting air flow to or from a remote location. The duct adapter system is adapted to deliver a warm air supply to the heat pump from the remote location, or deliver the cool discharge air from the heat pump water heater to a remote location.

Abstract: An isolated counter-flow air heat exchanging device with a vertical structure is provided, which includes two heat exchanging cores, four flow dividers, and six air ports. A first flow divider, a first heat exchanging core, a second flow divider, a third flow divider, a second heat exchanging core, and a fourth flow divider are disposed from top to bottom inside a main body structure, three air ports (A), (B), and (A?) are distributed at one side of the main body structure, and the other three air ports (C), (D), and (C?) are distributed at the other side of the main body structure parallel to this side. The first heat exchanging core and the second heat exchanging core are respectively formed with a plurality of heat sink fins, and each heat sink fin has a positive wind channel and a negative wind channel disposed at a distance. The air heat exchanging device occupies a small floor area. The two heat exchanging cores have large capacity, so the performance of heat exchange is large.

Abstract: A heating and cooling system for a wind turbine is provided and includes a gearbox, gearbox heat exchanger, generator, generator heat exchanger, and a cooling duct. The cooling duct is connected to the gearbox and generator heat exchangers, and is used to transport air across both heat exchangers to cool the gearbox and generator.

Abstract: A flow distributor is adapted to distribute two-phase refrigerant into a plurality of flow paths. The flow distributor includes a tubular main body having a center axis, at least one inlet port, and a plurality of outlet ports. The inlet port is disposed in a lower portion of the main body in a state in which the center axis of the main body is oriented in a generally vertical direction. The inlet port has a center axis that is not parallel to and does not intersect with the center axis of the main body so as to generate an upward spiraling flow of the refrigerant within the main body. The outlet ports form a plurality of openings disposed in an upper portion of the main body in the state in which the center axis of the main body is oriented in the generally vertical direction, with all of the openings being at least partially arranged in a plane orthogonal to the center axis of the main body.

Abstract: One embodiment of the present invention is a method for setting and controlling temperature of a device that includes: (a) thermally contacting the device to a heat transfer apparatus, the heat transfer apparatus having an apparatus intake to receive thermal transfer fluid, an apparatus exhaust to output thermal transfer fluid, and a conduit to conduct thermal transfer fluid from the apparatus intake to the apparatus exhaust through the heat transfer apparatus; (b) flowing a first thermal transfer fluid in a first thermal control circuit at a first temperature, and flowing a second thermal transfer fluid in a second thermal control circuit at a second temperature; (c) at a first predetermined time, directing the first thermal transfer fluid to flow to the apparatus intake, and from the apparatus exhaust back to the first thermal control circuit and the second thermal transfer fluid to flow in the second thermal control circuit without flowing to the apparatus intake; and (d) at a second predetermined time, di

Abstract: Disclosed herein is a header for a heat exchanger that has an inflow side, an outflow side, a bypass port therebetween, and a pressure-sensitive flapper valve proximal the bypass port. As pressure increases at the inflow side of the header, the flapper valve opens proportionally, and, as pressure decreases at the inflow side, the flapper valve closes proportionally. The flapper valve is preferably included as part of a service cartridge assembly to facilitate easy repair and/or replacement of the flapper valve. In some embodiments of the invention, a differential pressure is measured between the inflow and outflow sides, and activation of the heat exchanger is initiated in response to the differential pressure having exceeded a set point.

Abstract: A heat exchange unit (100) for hot gas recovery comprising, an inlet duct (34) to which a heat exchange duct (59) and a bypass duct (58) are connected, one being surrounded by the other, a heat exchange array (2) situated within the heat exchange duct (59) and a damper (50) arranged to direct the flow of gas through the unit (100), such that the damper (50) is situated within the inlet duct (34) and has two extreme positions, such that in a first extreme position the damper provides a first continuous surface and substantially seals one of the heat exchange and bypass ducts from the inlet duct and in the other extreme position the damper provides a second continuous surface and substantially seals the other of the ducts from the inlet duct.

Abstract: A large scale vapor dispersion apparatus for dispersing a vapor of essential oil without the use of water by forcing an air stream through and/or over a volume of the essential oil, vaporizing a portion of the essential oil, controlling the vaporization rate by increasing or decreasing the amount of heated air passing through the essential oil, and distributing the air and vapor mixture over a large scale space. The apparatus includes a blower, an evaporator assembly, piping joining the blower to the evaporator assembly, and a tray containing an essential oil. Other aspects in accordance with the present invention include a damper directing a portion of the air above and/or below the tray, and a vapor dispersing device for dispersing the air and vapor exhausted from the apparatus into a large space.