Method and apparatus for controlling variable air volume supply fans in heating, ventilating, and air-conditioning systems

摘要: A control strategy for supply fans in variable-air-volume heating, ventilating, and air-conditioning systems that reduces the static pressure at part-load conditions. The invention consists of a sensor, an airflow fan, fan modulating device, controller coupled to sensor sensor. includes calculator calculates setpoint as function rate. is lower when rate lower. compares with pressure, it commands device so remains close setpoint. Alternatively, loss coefficient setpoint, When sufficiently high, alternative embodiment switches constant-pressure controller.