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Recent content by MechEngNCPE

  1. MechEngNCPE

    HVAC chilled water lagging

    I like to spec foamglass preformed pipe insulation - just be lucky you're not installing that.
  2. MechEngNCPE

    hvac design

    Go D/X - not worth your trouble installing a chiller for 80T residential.
  3. MechEngNCPE

    Data Center Environment question

    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...
  4. MechEngNCPE

    Some 2D drawing lines have Z axis elevation height

    Gotta love it how the title block is in modelspace...
  5. MechEngNCPE

    Cleanouts in an old storm drain pipe

    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...
  6. MechEngNCPE

    Airflow required for pressure across large opening?

    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...
  7. MechEngNCPE

    Best Ductwork Material for Moisture Removal Process

    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.
  8. MechEngNCPE

    Tracking of components for a new build

    It comes with "Made in China" on the side of it.
  9. MechEngNCPE

    The 3/4 Rule (Hot and cold water)

    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.
  10. MechEngNCPE

    Return Air Plenum Pressure Drop

    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...
  11. MechEngNCPE

    Job Title ?

    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...
  12. MechEngNCPE

    The 3/4 Rule (Hot and cold water)

    Krafa what are you talking about???
  13. MechEngNCPE

    Job Title ?

    "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...
  14. MechEngNCPE

    Primary-Secondary Loop vs. Primary only Loop (with VFD)

    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...
  15. MechEngNCPE

    HVAC DUCT GAUGE SELECTION

    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.
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