SYSTEM AND METHOD FOR CONTROLLING OUTPUT FLOW OF PARALLEL CONNECTED BLOWERS

摘要

A ventilation system includes first and second blowers connected to a plenum in parallel, with a first motor drive to control a speed of an electric motor of the first blower and a second motor drive to control a speed of an electric motor of the second blower. A controller associated with the first blower is programmed to receive a set point for a controlled variable that is controllable by operation of the first and second blowers, estimate a total air flow required from the first and second blowers to reach the controlled variable set point, calculate a blower speed ratio between a first blower speed and a second blower speed that provides the required total air flow at a minimum power consumption level, and generate commands to cause the first blower and the second blower to operate at speeds resulting in the calculated blower speed ratio.

主权项

1. A ventilation system comprising:
a plenum; a first blower connected to the plenum to provide a first air flow thereto via operation of an electric motor associated with the first blower; a second blower connected to the plenum to provide a second air flow thereto via operation of an electric motor associated with the second blower, the second blower being connected to the plenum in parallel with the first blower; a first motor drive configured to control a speed of the electric motor associated with the first blower so as to also control a speed of the first blower; a second motor drive configured to control a speed of the electric motor associated with the second blower so as to also control a speed of the second blower; and a controller programmed to:
receive a set point for a controlled variable that is controllable by operation of the first and second blowers;estimate a total air flow required from the first and second blowers to reach the controlled variable set point;calculate a blower speed ratio between a first blower speed and a second blower speed that provides the required total air flow at a minimum power consumption level; andgenerate commands to cause the first blower and the second blower to operate at speeds resulting in the calculated blower speed ratio.