Maximum air changes per hour
Maximum air changes per hour
(OP)
I have a large diesel generator located in a building and need to improve the ventilation. My calculation shows 49,000 cfm are needed for ventilation to maintain a 20 delta t in the room.
This flow rate equals about 1 air change per minute. That seems like a large number to me. Is this realistic?
What is a maximum number for ach without feeling like you are in a wind tunnel?
This flow rate equals about 1 air change per minute. That seems like a large number to me. Is this realistic?
What is a maximum number for ach without feeling like you are in a wind tunnel?





RE: Maximum air changes per hour
The other solution would be to have the generator within its own enclosure outside on a skid.
RE: Maximum air changes per hour
The sections of exhaust pipes that are in the room are a often over-looked heat load. The low-emission diesels' exhaust gets REALLY hot!
RE: Maximum air changes per hour
From a practical standpoint, at what number of air changes per hour is too much and direct ducting to the outside should be considered?
RE: Maximum air changes per hour
Take the "V" out of HVAC and you are left with a HAC(k) job.
RE: Maximum air changes per hour
Take the "V" out of HVAC and you are left with a HAC(k) job.
RE: Maximum air changes per hour
RE: Maximum air changes per hour
why is it that most people omit to indicate their project location in these forums? It is so important. The reason I say this is that if you are in the rust belt (US of course), you may want to worry about that much cold air freezing your oil or your sprinkler system.
Check out the Tier 3 EPA regulations that just went into effect 3 weeks ago (January 1, 2007) about emissions, will you comply with EPA tier 3 emissions using a cooling tower?
RE: Maximum air changes per hour
RE: Maximum air changes per hour
The less components, the better off you will be.
By the way, how do you handle your flue exhaust? Make sure that you go up to the highest roof. I've seen a 1500 KW gen set on grade about 50 feet away from the buuling that triggered the AHU duct smoke detector on the roof (150 feet away) by entrainment of gen set flues to the OA intakes.
RE: Maximum air changes per hour
RE: Maximum air changes per hour
RE: Maximum air changes per hour
2 fans are installed and will be staged to provide 0%/50%/100% airflow. As the genertors are also standby machines we decided there were no real advantages to using VFD's.
Most difficult issue was providing sufficient acoustic attenuation in the makeup to achieve the required noise levels in the adjacent carpark.
RE: Maximum air changes per hour
Take the "V" out of HVAC and you are left with a HAC(k) job.