Pressure differential

[ptonsparky]

Thinking. Customer with a large building with climate controlled storage that maintains 50 degrees at about 90% humidity. Each storage bin has roughly 180K CFM of air flow. Most of it is recycled but we still have leakage and exhaust to a common area. There are dampers in this area that are supposed to allow this air to exhaust but it just isn't working. Attached is an area we, I, do not want the conditioned air entering, or at least limit it. Forget airlock doors. To much foot traffic. There is a wall dividing the two areas to cut down on the air exchange. I would like to set up a 4-20 ma differential pressure control that would respond to the pressures of each side. This would run exhaust fan(s) via a vfd on "humid" side.

Sounds simple but is it a practical application?

 

[masterinbama]

should be able to, with just a DP transmitter and the proper closed loop controller.

 

[weressl]

Thinking. Customer with a large building with climate controlled storage that maintains 50 degrees at about 90% humidity. Each storage bin has roughly 180K CFM of air flow. Most of it is recycled but we still have leakage and exhaust to a common area. There are dampers in this area that are supposed to allow this air to exhaust but it just isn't working. Attached is an area we, I, do not want the conditioned air entering, or at least limit it. Forget airlock doors. To much foot traffic. There is a wall dividing the two areas to cut down on the air exchange. I would like to set up a 4-20 ma differential pressure control that would respond to the pressures of each side. This would run exhaust fan(s) via a vfd on "humid" side.

Sounds simple but is it a practical application?

It is a classical application. Usually a draft gauge pressure transmitter is installed and set to maintain 1-2"WC (WaterColumn) pressure.