METHOD AND APPARATUS FOR CONTROLLING VENTILATION SYSTEM

摘要

An energy recovery ventilation system is described which allows for continuo us fan speed control through pulse width modulation of direct current fans. The device described is capable of fine motor speed control without the disadvantages o f high noise, low efficiency and a fixed number of speeds present in commonly-used speed- varying techniques used with alternating current (AC) fans. This is accomplished through the use of direct current (DC) fans and pulse width modulation. A controller is used to optimize the ventilation and energy efficiency of the system through the use of sever al temperature sensors. The device also provides a control process for the self-optimizatio n of the system, should it be detected that the supply and exhaust airflows are unequal. An unbalance is detected by calculating the thermal efficiencies of the exhaust and supply airflows.