estimating static pressure
estimating static pressure
(OP)
I need some advice on estimating operating conditions for a fan. I have a simple exhaust system moving air through approximately 180' of 66" round duct, through a fan, and then discharging the air into a stack. I know the desired air flow, and the inlet and outlet velocity of the fan. How can I use this information to estimate the staic pressure at the fan during operation?





RE: estimating static pressure
Otherwise you can guess using a ductulator to get a ball park number.
RE: estimating static pressure
SMACNA is another source besides the ones Walkes mentioned.
RE: estimating static pressure
RE: estimating static pressure
RE: estimating static pressure
One word of caution. If additional fans are discharging into the stack you mention, the stack could be slightly pressurized. It is not unusual to see 3-4" of static pressure in a stack. If that is the case, that must also be added to the static pressure requirements of the fan.
RE: estimating static pressure
Statics are really a stab in the dark however experience gives you insight to the true operating characteristics.
Its amazing on how many poor layouts are being designed even by "experienced" designers.
I go on the heavy side because I like to sleep well at night. Many equipment has VFD's and sheaves are inexpensive if you need to turn it down somewhat. It's going in the other direction that causes you pain.
RE: estimating static pressure
I strongly object to characterizing those organizations and their data that way.