Abstract: A heat exchanger system for a vehicle includes at least one heat exchanger, a centrifugal fan assembly for improving the flow of air through the at least one heat exchanger, the fan assembly including a rotatably mounted impeller with a plurality of impeller blades, and a rotatable inlet shroud for guiding the air flow entering the impeller; and a stationary inlet shroud located between the at least one heat exchanger and the fan assembly and configured for directing air exiting the at least one heat exchanger towards the rotatable inlet shroud of the fan assembly. The fan assembly further includes a stator with a plurality of stationary stator blades located radially or semi-radially outside the impeller for conversion of fluid dynamic pressure to fluid static pressure of the air flow.

Abstract: A heat exchanger system for a vehicle includes at least one heat exchanger, a centrifugal fan assembly for improving the flow of air through the at least one heat exchanger, the fan assembly including a rotatably mounted impeller with a plurality of impeller blades, and a rotatable inlet shroud for guiding the air flow entering the impeller; and a stationary inlet shroud located between the at least one heat exchanger and the fan assembly and configured for directing air exiting the at least one heat exchanger towards the rotatable inlet shroud of the fan assembly. The fan assembly further includes a stator with a plurality of stationary stator blades located radially or semi-radially outside the impeller for conversion of fluid dynamic pressure to fluid static pressure of the air flow.

Abstract: The invention includes an arrangement for a compressed air system including an air compressor arranged to generate compressed air for the compressed air system, an air dryer arranged to dry the generated compressed air and an arrangement for unloading the air compressor in certain conditions. The arrangement for unloading includes a control unit arranged to send a control signal to a valve, an air line between the valve and the air compressor, with the control unit being arranged to activate the control signal for unloading the air compressor in the event of at least one predetermined operating state of the air compressor. A method for a compressed air system is also disclosed. Improved unloading of an air compressor can be obtained, which takes place in the event of certain predetermined operating states, such as for example, when an engine speed exceeds a particular limit value.