An air heater is used for a drying tower, wherein the air heater includes a combustion chamber, a burner, an air heating chamber, a process air access, a process air exit and/or a flue gas exit. During operation of the air heater, a process air is supplied to the air heating chamber by way of the process air access, a fuel is burned by means of the burner, a heat thus generated in the combustion chamber is transferred to the process air in the air heating chamber and the heated process air is discharged out of the air heater by way of the process air exit, and the air heater comprises an expendable combustion chamber, wherein the expendable combustion chamber is disposed within the combustion chamber. Further, a drying tower is used for drying a product to be dried with an air heater.

A closed variable-frequency heat pump drying device with a heat regenerator includes a variable-frequency compressor, a condenser, a throttling valve, an evaporator, a heat regenerator, a three-way valve, a variable-frequency fan, an air inlet temperature sensor, an air inlet humidity sensor, a drying bin, an air outlet temperature sensor, an air outlet humidity sensor and a controller. The controller regulates frequency of the variable-frequency compressor by comparing magnitudes of actual and set air inlet temperatures; a ratio of a straight-through air volume to a regenerated air volume of the three-way valve by comparing magnitudes of actual and set air inlet humidity; and frequency of the variable-frequency fan by comparing magnitudes of actual and set air humidity difference and magnitudes of actual and set air temperature difference of medium air entering and exiting the drying bin.

A multi-stage separation heat-exchange type drying system is provided. A plurality of first heat exchange blocks of the first main body are installed to be spaced from each other at a predetermined interval, and first vortex generating blocks are installed between the first heat exchange blocks. Also, a plurality of second heat exchange blocks of the second main body are installed to be spaced apart from each other at a predetermined interval, and second vortex generating blocks are installed between the second heat exchange blocks. The heat exchange occurs in a manner that the first heat exchange blocks and the second heat exchange blocks corresponding to each other, positioned up and down, exchange a heat medium therebetween.

A dryer apparatus is disclosed comprising a container having a container inlet and outlet, a pump that is configured to motivate a first air-vapor mixture flow via the container inlet and via the container outlet, a heating device configured to heat the first air-vapor mixture, a selector with at least two states, a compressor that is configured to compress and motivate a part of the first air-vapor mixture flow as a second air-vapor mixture flow, to flow through a first heat exchanger and to flow through a second heat exchanger and a pressure reducing device that is configured to reduce the pressure of said second air-vapor mixture downstream said first heat exchanger. The selector is configured to direct most of the first air-vapor mixture to flow in a closed cycle through the container, or configured to exchange most of the first air-vapor mixture with air located outside the apparatus.

The present disclosure provides a method and apparatus for use in a flue-cured barn. The apparatus comprises a combustion chamber for burning fuel; an exhaust pipe for allowing combustion gases to leave the combustion chamber; and a fan for drawing the combustion gases along the exhaust pipe away from the combustion chamber and for generating a negative pressure within the combustion chamber and exhaust pipe compared with the pressure outside the apparatus.

Apparatus (10) for drying and cooling seeds (S), comprising a container (38) for the seeds (S); a device (15) to suck in the air (Va) from the outside environment and to send it toward the seeds (S) to be dried and cooled; a first heat exchange unit (11) configured to cool the air taken from the outside environment and raise its relative humidity; a second heat exchange unit (12) configured to lower the temperature and absolute humidity of the air from the first heat exchange unit (11); and a third heat exchange unit (13) fluidically connected to the second heat exchange unit (12) to receive the cooled air exiting from the latter, and provided with a first heat exchange circuit (110) able to be selectively activated to raise the temperature and lower the relative humidity of the air passing through said third heat exchange unit (13), and able to be selectively de-activated to send the cold air coming from said second heat exchange unit (12) to the seeds (S).

A dryer apparatus is disclosed comprising a container having a container inlet and outlet, a pump that is configured to motivate a first air-vapor mixture flow via the container inlet and via the container outlet, a heating device configured to heat the first air-vapor mixture, a selector with at least two states, a compressor that is configured to compress and motivate a part of the first air-vapor mixture flow as a second air-vapor mixture flow, to flow through a first heat exchanger and to flow through a second heat exchanger and a pressure reducing device that is configured to reduce the pressure of said second air-vapor mixture downstream said first heat exchanger. The selector is configured to direct most of the first air-vapor mixture to flow in a closed cycle through the container, or configured to exchange most of the first air-vapor mixture with air located outside the apparatus.

A process air unit (20) for heating a process air (21) for a workpiece processing system comprises a process air duct (22) through which a process air (21) can flow, a combustion chamber (30) for burning a combustion air, which is overflowed by the process air (21) in the process air duct (22) and thereby transfers heat to the process air (21), and a tube bundle arrangement (35) connected to the combustion chamber, which comprises at least one tube bundle (36) having a plurality of tubes (38) through which the flue gas (34) from the combustion chamber (30) can flow. The plurality of tubes (38) of the at least one tube bundle (36) is oriented in the process air duct (22) transversely to the process air flow direction, so that they are overflowed by the process air (21) and thereby transfer heat from the flue gas (34) to the process air (21), and the tube bundle arrangement (35) is arranged, with respect to the process air flow direction, upstream of the combustion chamber (30) in the process air duct (22) in order to achieve increased energy efficiency.

A heated paint drying system for drying paint on a vehicle using heated pressurized air includes an air supply supplying pressurized air. An air hose is coupled to the air supply and transfers pressurized air from the air supply. A housing includes a handle section, a head section, and a channel extending through the housing from the head section to the handle section. The air hose is in fluid communication with the channel when the air hose is coupled to the housing. A valve is positioned within the channel and a trigger selectively opens or closes the valve. A heat emitter is attached to the housing and heats pressurized air passing through the channel. An electricity generator is electrically connected to the heat emitter. The electricity generator has a driver manipulated by the flow of pressurized air, wherein the heat emitter is turned on when the driver is manipulated.

A multi-stage separation heat-exchange type drying system is provided. A plurality of first heat exchange blocks of the first main body are installed to be spaced from each other at a predetermined interval, and first vortex generating blocks are installed between the first heat exchange blocks. Also, a plurality of second heat exchange blocks of the second main body are installed to be spaced apart from each other at a predetermined interval, and second vortex generating blocks are installed between the second heat exchange blocks. The heat exchange occurs in a manner that the first heat exchange blocks and the second heat exchange blocks corresponding to each other, positioned up and down, exchange a heat medium therebetween.