Patent ID: 9182139
Filing Date: 2015-11-10
Classification: F24F,Y02B

Abstract:
1. An air pressure controlling system comprising: a supply airflow rate controller regulating, using a supply air valve, an airflow rate of supply air that is blown into an applicable room; a common exhaust airflow rate controller controlling, by a common exhaust air valve, an airflow rate of exhaust air that is drawn from an applicable room; a differential pressure measuring device measuring a pressure difference between the applicable room and a specific reference chamber; an airflow rate changing portion calculating a control output value for the supply air and a control output value for the exhaust air at a time of an airflow rate change controlling operation, the time of an airflow rate change controlling operation comprising either a time of increasing the supply and exhaust airflow rate or a time of decreasing the supply and exhaust airflow rate, wherein a correction output calculator calculating a correction control output value for a valve, either the supply air valve or the common exhaust air valve, that is being operated as a room pressure controlling valve, based on a deviation between a specific setting value and the pressure difference measured by the differential pressure measuring device; a summing device summing the control output value and the correction control output value to obtain a sum value of the control output value and the correction control output value, corresponding to the valve that is being operated as the room pressure controlling valve at the time of the airflow rate change controlling operation; and a suspension evaluator either suspending an output of the sum value or outputting the sum value to the room pressure controlling valve at the time of the airflow rate change controlling operation, wherein