This makes no sense, first of all 85 degree water is not chilled, maybe you are thinking of cooling tower water? Or did you mean space temp? Your CRAC units may not be able to handle the load if you are seeing high humidity. Make sure your supply air setpoints are 55 degrees or less, check...
Definitely do a camera pass through, you would see cleanouts on the drawings, typically. I'm thinking dickswerrat is on the right track. You could do a flow calc and check to see if other roof drains /scuppers are clogged that might increase the required flow to this drain. Any plumber could...
That is the equation, I use it all the time as a pharmaceutical HVAC engineer designing pressurization plans. Yes it comes out to a shit-ton of air. I had an undercut door for a conveyor across a ISO class 7-8 cleanroom with .06"wc differential and it came out to 8000 cfm. Sure bumps up your...
304 SS would be the way to go, specify -6" pressure test, leakage class A. Insulate outside and down through the roof a few feet so if the fan is off in the winter you reduce the chance that condensate will form on the outside of the duct.
I think he's talking about some kind of 75% diversity rule, I'm not sure what it is though. Just read the IPC section on fixture units. It has everything you need.
Usually the pressure drop associated with air traveling through a plenum is so slight that it can be compensated for by a rule of thumb. In your case, take the pressure drop of the return grilles, transfer ducts, damper(s), sharp entrance to return duct, etc. and add them up. Transfer ducts...
In house, "Engineer" is fine to use as a job title - it's when you present yourself with that title to others outside your office where it becomes a problem. Use EIT after your name since you have that certification, that's what I did. I was a "Mechanical Designer" on my buisness card/email up...
"I am most definately not falsely representing myself by calling myself an engineer just because I do not yet have the PE certification."
Be careful - in North Carolina at least you can be taken to court for misrepresentation. BTW, you are NOT an Engineer unless you are Licensed...
You should stage the chillers such that one is at full load when the next stages on. The owner should hire an engineer to modify the sequence of operation of the chiller plant. When you say "Chillers are staged to meet demand based on flow" is this not a constant volume primary arrangement...
72x43? I would go with at 60x36 if you can. That is only .1"/100ft drop at that flow and 2250 fpm. And why the 43? When the next guy goes to measure the duct when it's insulated he's going to call it a 42 or 44, so why not stick to regular sizes.
