Air flow control system and method for a dual duct system

摘要

A dual-duct HVAC system for providing a desired comfort level in a room, includes a controller that carries out a simple operation that determines the total open damper positions for dual dampers in a dual duct system to effect a desired air flow. Using the total open damper position information as damper control information, the controller also determines a relative damper position difference required between the two dampers to effect a desired temperature level while also meeting the air flow requirement as determined from the total open damper position information. The combination of the total open damper position information and the relative damper position difference is used as control information to control both dampers. Preferably, the controller gives priority of air flow control over temperature control by determining a valid damper position difference range for use in conjunction with the total open damper position information.