Question in PRESSURE ROOM
Question in PRESSURE ROOM
(OP)
PRESSURE ROOM
HOW TO CALCULATE PRESSURE ROOM IN PASCAL ??
i have ROOM SIZE : 4m * 4m * 3m (height)
how many cfm i need to make this room 1 pascal (positive pressure)
pls
HOW TO CALCULATE PRESSURE ROOM IN PASCAL ??
i have ROOM SIZE : 4m * 4m * 3m (height)
how many cfm i need to make this room 1 pascal (positive pressure)
pls





RE: Question in PRESSURE ROOM
RE: Question in PRESSURE ROOM
Let's say the room above was in feet to keep the units simple, so 4ft x 4ft x 3ft or 48 cubic feet. In a perfect scenario with absolutely no leakage, would it not be true that adding 48 cubic feet of air to this room would increase the pressure by a factor of 1 atmosphere or 14.7 psi? I know this is way outside the realm of room pressurization, but just thinking it out to an extreme. Every time you fill the volume with air, the pressure should increase by 1 atmosphere, correct?
RE: Question in PRESSURE ROOM
Q = C*A*sqrt(2*dP/rho)
where
C = discharge coefficient for opening, dimensionless
A = Flow opening area or leakage area, m2
dP = pressure difference across opening, Pa
Q = airflow rate, m3/s
rho = air density, kg/m3
From the above equation, you will see the parameters required in room pressurization concept.
Hope this help you.
RE: Question in PRESSURE ROOM
okay
1. i have gap in tow doors ( 1 cm*0.90 cm)
2. gypsum board for selling is sealed
3. 4 led panel light (60*60) 48 watt
4. the important things i have safety cabinet in one room
5. the safety cabinet is class 2 type B2 that mean is Exhaust all air out side building (800cfm)
6. no cracks no windows no another leakage
and thanks for your response .
RE: Question in PRESSURE ROOM
RE: Question in PRESSURE ROOM
Apart from performing design calculations, to maintain a room differential pressure at the level desired is NOT EASY in practice. Your control strategy is crucial and upmost important. Is your safety cabinet with VAV control? Is achieving a proper directional airflow (inward for a -ve room) good enough for your project? Just to throw some, all these will affect your decision on control strategy.
Good luck.
RE: Question in PRESSURE ROOM
RE: Question in PRESSURE ROOM
RE: Question in PRESSURE ROOM
RE: Question in PRESSURE ROOM
If you really want to operate at negative .0040865 in wg, Exh minus Supply CFM differential would need to be about 800 CFM instead of 400
RE: Question in PRESSURE ROOM