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  1. designbuild

    HVAC Duct Crossing Building Expansion Joints

    MintJulep, I would expect that the condition described by sigma1 could occur on only one occasion and that would be an earthquake. I was thinking along the same lines at Chris. Unless it is a horribly negative pressure your best bet is probably regular ol' flex duct, oversized just a bit to...
  2. designbuild

    Server Room AC

    Tombtech If you select an off-the-shelf A/C unit (or a coil) for a total Btuh, you will not be buying all of that capacity in Sensible load. Your unit selection will be busy drying and dehumidifying the last bit of air while your computer components overheat, instead. My whole point was that it...
  3. designbuild

    Server Room AC

    Tombmech you make a good point on the diversity, especially regarding computer rooms. Generally the people setting up servers want to squeeze as much performance out of them as possible. This means that the equipment will run a lot closer to the rated output. However I don't agree with your...
  4. designbuild

    Who insures chillers ?

    I find it is not so much any one element of service that the larger service companies provide that is important, it is the total package. A larger outfit is more likely to have more than one person trained to work with your specific machine, not just type (screw, centrifugal, etc) but brand and...
  5. designbuild

    Who insures chillers ?

    In the states there are usually a couple of routes to go. Most manufacturers, Trane, Carrier, York have a rental division specifically for providing exactly what you are asking for. It isn't insurance per say but they do offer rental chillers, air handlers, pumps, tower, etc. In the...
  6. designbuild

    High Velocity Furnace

    Keep your duct outlets in mind as well. For most grilles if you get in the 700 FPM face velocity you are pretty loud. 6000+ FPM to 700 FPM is a pretty tall order. I would say it is time to use your people skills to show that they should spend a little bit of it on their mechanical system, or...
  7. designbuild

    Heat Pump

    willard3 has a very good point. One way to overcome this problem would be to have a central outdoor air unit that provides room neutral, or even preconditioned, outside air to the individual units. This is common in the schools in my area. It is very much a $$ game, is it cheaper to do a...
  8. designbuild

    VAV terminal mode of operation

    SMACNA says ducts upstream of VAV boxes should be installed to withstand a minimum of 2" w.c. ESP. In practice what you want to do is minimize the static pressure in the duct but still maintain full air flow. By minimizing static pressure you minimize fan HP and hence energy costs. The...

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