View Full Version : Vestibule / Air-lock
03-08-2005, 11:05 AM
I'm trying to calculate the air loss through a pressurized vestibule/air-lock when the door opens.
I've come up with a couple calculations but do not have a high degree of confidence in either.
psu104, I am not sure what you are doing. When I am balancing an airlock, normally, we will count the doors connected with the airlock, rule of thumb, one door 100 cfm. If this is a positive airlock, you won't return or exhaust anything for this space. The lab design guide does not require you to maintain the pressure when doors are open. Would you explain your situation a little bit more? It really depends which kind of pressure you have around this space.
03-08-2005, 01:08 PM
well, what we are trying to do is calculate the moisture gain from the air entering the air lock open a door is opened. the lab is a controlled environment at 15%RH. The airlock is on the same HVAC system as the lab so any moisure gained into the airlock will eventually turn up as a moisture load in the unit.
this is airlock i normally see in my projects. corridor, airlock and lab. airlock has two doors, one to corridor and one to the lab. see if the lab is controled to be negative(-), the corridor is positive(+), the airlock shall be controlled positve to each side. So when you open the door between the airlock and corridor, idealy, the air will move from the airlock to the corridor. If you have that a tight control room, the room shall be positive to all other space, which will limit the unwelcomed air into your space. You might consult a dehumidifier mfg to do the calc. to you.
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