Room pressure controlling system and room pressure controlling method

Abstract

A room pressure controlling system includes: a room pressure correction controlling portion that controls a supply air valve or an exhaust valve, whichever is operated as a room pressure controlling valve, so that a between-room differential pressure between an applicable facility and a reference room that is set to a reference room pressure will match a room pressure set point; an offset flow rate set point switching portion that switches an offset flow rate set point when an instruction has been received from an outside to switch the applicable facility between positive and negative pressure; and a room pressure set point switching portion that switches the room pressure set point in coordination with switching of the offset flow rate set point.

1 . A room pressure controlling system comprising:
 a supply air valve that regulates a flow rate of supply air that is blown out into an applicable facility;   an exhaust valve that regulates a flow rate of an exhaust that is drawn in from the applicable facility;   a flow rate balance controlling portion that controls the supply air valve or the exhaust air valve, whichever is not used as a room pressure controlling valve, so that the difference between the supply air flow rate, regulated by the supply air valve, and the exhaust flow rate, regulated by the exhaust valve, will match an offset flow rate set point;   a room pressure correction controlling portion that controls the supply air valve or the exhaust valve, whichever is operated as the room pressure controlling valve, so that a between-room differential pressure between the applicable facility and a reference room that is set to a reference room pressure will match a room pressure set point;   an offset flow rate set point switching portion that switches the offset flow rate set point when an instruction has been received from the outside to switch the applicable facility between positive and negative pressure; and   a room pressure set point switching portion that switches the room pressure set point in coordination with switching of the offset flow rate set point.   
     
     
         2 . The room pressure controlling system as set forth in  claim 1 , wherein:
 the offset flow rate set point switching portion, upon reception of an instruction for switching from a positive pressure to a negative pressure, switches the offset flow rate set point from an offset flow rate set point for positive pressure control to an offset flow rate set point for negative pressure control, and, upon reception of an instruction for switching from negative pressure to positive pressure, switches the offset flow rate set point from the offset flow rate set point for the negative pressure control to the offset flow rate set point for the positive pressure control; and   the room pressure set point switching portion, upon reception of an instruction for switching from the positive pressure to the negative pressure, switch the room pressure set point from a room pressure set point for positive pressure control to a room pressure set point for negative pressure control, and, upon reception of an instruction for switching from negative pressure to positive pressure, switch the room pressure set point from the room pressure set point for the negative pressure control to the room pressure set point for the positive pressure control.   
     
     
         3 . The room pressure controlling system as set forth in  claim 1 , further comprising:
 a room pressure controlling valve that regulates either the supply air flow rate or the exhaust flow rate, instead of operating either the supply air valve for the exhaust valve as the room pressure controlling valve; wherein:   the flow rate balance controlling portion controls the supply air valve and the exhaust valve so that the difference between the supply air flow rate that is regulated by the supply air valve and the exhaust flow rate that is regulated by the exhaust valve will match an offset flow rate set point.   
     
     
         4 . A pressure controlling method, comprising:
 a flow rate balance controlling step for controlling, by a flow rate balance controlling portion, a supply air valve or an exhaust air valve, whichever is not used as a room pressure controlling valve, so that the difference between the supply air flow rate, regulated by the supply air valve, and the exhaust flow rate, regulated by the exhaust valve, will match an offset flow rate set point;   a room pressure correction controlling step for controlling, by a room pressure correction controlling portion, the supply air valve or the exhaust valve, whichever is operated as the room pressure controlling valve, to cause a between-room differential pressure between an applicable facility and a reference room that is set to a reference room pressure to match a room pressure set point;   an offset flow rate set point switching step for switching, by an offset flow rate set point switching portion, the offset flow rate set point when an instruction has been received from the outside to switch the applicable facility between positive and negative pressure; and   a room pressure set point switching step for switching, by a room pressure set point switching portion, the room pressure set point in coordination with switching of the offset flow rate set point.   
     
     
         5 . The room pressure controlling method as set forth in  claim 4 , wherein:
 in the offset flow rate set point switching step, upon reception of an instruction for switching from a positive pressure to a negative pressure, the offset flow rate set point switching portion switches the offset flow rate set point from an offset flow rate set point for positive pressure control to an offset flow rate set point for negative pressure control, and, upon reception of an instruction for switching from negative pressure to positive pressure, switches the offset flow rate set point from the offset flow rate set point for the negative pressure control to the offset flow rate set point for the positive pressure control; and,   in the room pressure set point switching step, upon reception of an instruction for switching from the positive pressure to the negative pressure, the room pressure set point switching portion switches the room pressure set point from a room pressure set point for positive pressure control to a room pressure set point for negative pressure control, and, upon reception of an instruction for switching from negative pressure to positive pressure, switches the room pressure set point from the room pressure set point for the negative pressure control to the room pressure set point for the positive pressure control.   
     
     
         6 . The room pressure controlling method as set forth in  claim 4 , comprising:
 a room pressure controlling valve for regulating either the supply air flow rate or the exhaust flow rate, instead of operating either the supply air valve for the exhaust valve as the room pressure controlling valve; wherein:   in the flow rate balance controlling step, the flow rate balance controlling portion controls the supply air valve and the exhaust valve so that the difference between the supply air flow rate that is regulated by the supply air valve and the exhaust flow rate that is regulated by the exhaust valve will match an offset flow rate set point.