Nozzle assembly for exhaust fan unit of HVAC system
A fan unit a nozzle assembly including a plurality of nozzles configured to receive an air flow and to expel the air flow through a plurality of outlets corresponding to the plurality of nozzles. A controller configured to control a longitudinal movement of a nozzle of the plurality of nozzles based on an operating condition associated with the fan unit.
1 . A fan unit, comprising:
a nozzle assembly including a plurality of nozzles configured to receive an air flow and to expel the air flow through a plurality of outlets corresponding to the plurality of nozzles, the plurality of nozzles including a first nozzle having a first outlet and a second nozzle disposed outward of the first nozzle and having a second outlet; and
a controller configured to control a longitudinal movement of one of the first nozzle and the second nozzle based on an operating condition associated with the fan unit to adjust a longitudinal distance between the first outlet and the second outlet,
wherein the first outlet has a uniform dimension and the second outlet has a dimension that changes based on the longitudinal distance between the first outlet and the second outlet.
2 . The fan unit of claim 1 , comprising a sensor configured to detect the operating condition, wherein the controller is configured to receive, from the sensor, sensor data indicative of the operating condition.
3 . The fan unit of claim 1 , wherein the controller is configured to control the longitudinal movement of the one of the first nozzle and the second nozzle based on an exhaust demand corresponding to the operating condition.
4 . The fan unit of claim 1 , further comprising an actuation assembly configured to be controlled by the controller to cause the longitudinal movement of the one of the first nozzle and the second nozzle.
5 . The fan unit of claim 4 , further comprising a base, wherein the actuation assembly is coupled to the base and to the one of the first nozzle and the second nozzle to enable the longitudinal movement of the one of the first nozzle and the second nozzle relative to the base.
6 . The fan unit of claim 4 , wherein the actuation assembly is coupled to the one of the first nozzle and the second nozzle, and the actuation assembly is configured to be controlled by the controller to cause the longitudinal movement of the one of the first nozzle and the second nozzle relative to the other of the first nozzle and the second nozzle.
7 . The fan unit of claim 1 , wherein:
the first nozzle comprises a tapered outer surface and the second outlet borders the tapered outer surface; and
the controller is configured to control the longitudinal movement of the one of the first nozzle and the second nozzle based on the operating condition associated with the fan unit such that the longitudinal movement of the one of the first nozzle and the second nozzle changes a cross-sectional area of the second outlet.