power plant ventilation
power plant ventilation
(OP)
Other than keeping a certain level of filtered air or strelized environment,why do we need a positive pressure inside a room which is equiped with electrical generators or motors.
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
|
RE: power plant ventilation
RE: power plant ventilation
RE: power plant ventilation
It is critical to get fresh air into the generator spaces in such a manner that the engines and generators recieve sufficient air to dissipate the heat, but that does not necessarily result in a positive pressure condition. When we have multiple engine-gensets, we often use fans to deliver this air, so in some cases that will be a positive pressure condition. But if the physical arrangement is such that a natural flow will work, then we will have a negative pressure relative to atmospheric. We sometimes provide filters in the louvers to minimize dirt infiltration. It depends on the location, project, etc....
Do you know of a code requirement or ASHRAE recommendation for positive pressure?
Thanks,
EEJaime
RE: power plant ventilation
I will let you know about any Ashrae recommendation.In our case this is a request from the customer.
RE: power plant ventilation
rmw
RE: power plant ventilation
Never heard of such a requirement.
RE: power plant ventilation
RE: power plant ventilation
rmw
RE: power plant ventilation
RE: power plant ventilation
RE: power plant ventilation
RE: power plant ventilation
What is the meaning of applying positive pressure in a room in terms of figures?
Is it :
cfm on supply must be more than cfm of exhaust?
or
cfm on supply should be the same as cfm on exhaust but at a higher pressure.
or
is it both?
or use fans (where?) instead of natural flow?
Iam really confused.
RE: power plant ventilation
For general pressure control a 10% variation in airflows will give you a positive or negative pressure.
RE: power plant ventilation
Let's say I need to exhaust 3000cfm,so I will use an intake fan of 3000+10%=3300cfm supply to achieve positive pressure.
Now how do I size my exhaust grill to guarantee exhausting 3000cfm ..not less not more?..taking into consideration the 3ooocfm(needed to be exhausted) we have three variables:the speed ,the static pressure and size of grill.
????How do I select the size of grill?
RE: power plant ventilation
B.E.
RE: power plant ventilation
If you don't have an exhaust fan, then you will ultimately have 3000 cfm in, 3000 cfm out.