Building Pressurization
Building Pressurization
(OP)
Hi experts,
For an office building, do we have a rule of thumb or recommended percentage for the pressurization? Say outdoor air 5% higher than the exhaust?
thank you
For an office building, do we have a rule of thumb or recommended percentage for the pressurization? Say outdoor air 5% higher than the exhaust?
thank you
RE: Building Pressurization
Ideally you get a tight and well insulated building and have neutral pressure. If you have too large pressure differences, you also can get problems with doors.
So no, a rule of thumb won't work well.
RE: Building Pressurization
I’ve never seen an all encompassing approach because building pressure targets are seasonal and also subject to building stack effect, and also depends on how compartmentalized all your spaces are. To really engineer it I would say you target your main envelope areas with cracks like the lobbies and areas with lots of glazing, then you do a crack area calculation on how much air to create the delta P between inside and outside that you want in that area. Compare that to your 5% and you’ll see how much it makes sense.
To me this is an elusive value that you’ll get 100 different answers for. And keep in mind you may want to differ your pressure target from positive in summer to neutral/negative in the winter, and should even compensate from the seasonal stack effect of floors above/below depending on where your sensor is if you have just 1 sensor/point of control.
RE: Building Pressurization
RE: Building Pressurization