Energy saving-exhaust control and auto shut off system

摘要

An energy-efficient ventilation system comprises a ventilation fan, ductwork, system controller, and a plurality of ventilation points, each comprising a damper, a differential pressure sensor, a ventilation point controller, and a fume detector. When a ventilation point does not require ventilation, a signal is sent to the system controller to reduce the ventilation fan speed thereby using only as much energy as is needed to provide service to the ventilation points that need ventilation. The fume detector, damper, and differential pressure sensor for each ventilation point are used to determine whether ventilation is needed at a ventilation point and to control the ventilation point accordingly.

主权项

1. A method of increasing an efficiency of an exhaust ventilation system that comprises an exhaust ventilation fan that generates a ventilating force in an exhaust ventilation system duct, an exhaust ventilation system controller, and a plurality of exhaust ventilation points coupled to the exhaust ventilation system duct, each exhaust ventilation point having an exhaust ventilation load, a controllable damper, an exhaust ventilation point ductwork coupled to the controllable damper and to the exhaust ventilation system duct, a differential pressure sensor, a piece of equipment having an equipment ON/OFF switch and that generates fumes and is ventilated by the exhaust ventilation point ductwork, a system airflow sensor coupled to the exhaust ventilation system duct and an exhaust ventilation point controller coupled to the controllable damper, the differential pressure sensor, the system airflow sensor and the ON/OFF switch, the method comprising:
reducing, by the exhaust ventilation system controller, the ventilation force generated by the exhaust ventilation fan in response to detecting a reduction in the exhaust ventilation load of at least one exhaust ventilation point, selectively adjusting a speed of the exhaust ventilation fan such that the system airflow sensor reads a predetermined level regardless of a current position of each damper in each of the exhaust ventilation points, and selectively adjusting the damper of each exhaust ventilation point such that the differential pressure sensor of each exhaust ventilation point reads a predetermined level.