Room Pressure and volume change
Room Pressure and volume change
(OP)
I have a client that needs to maintain a negative pressure in a production room. Our question is: keeping air flow rates constant(Qin and Qout), will a decrease in the room volume cause an increase in the room pressure? And is there a formula that addresses this situation. I do not have exact numbers at the moment. Thanks,





RE: Room Pressure and volume change
Consider that building tightness directly affects the issue, so exact selection that takes into account only ventilation system does not help.
Normally, you should, for instance, specify exhaust fan with 5% more flow than supply fan.
There are some processes that does require exact control of negative pressure. Than pressure sensor-regulated fan is needed.
The issue of room volume change I do not completely understand.
If there are some partitions occasionally used, you will have to know which volume combinations may exist, so to select adequate fans that cover range, as pressure situation will certainly change.
RE: Room Pressure and volume change
RE: Room Pressure and volume change
You should get a Mechanical Engineer involved in this and not try to guess.
RE: Room Pressure and volume change
RE: Room Pressure and volume change
I am thinking you are talking about setting the room up empty, then adding some large machine in there. This will not affect your balance, and therefore your pressure, unless it is appreciably obstructing the airflow or somehow makes or closes leaks.
RE: Room Pressure and volume change
Good on ya,
Goober Dave