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  1. NNACons

    Kitchen Exhaust Make-up/direct fired

    I see your op tions as rather limited. 1) retrofit existing dining room system to accomodate for additional outside air in order to pressurise dining room in relation to kitchen while actually acting as makeup air for kitchen exhaust. This can introduce some rather large outside air loads...
  2. NNACons

    Q: Using Carrier's Method...

    Just noted an error in my previous post\ 100% o/a [1.2x(l/s)x(toa -Tra)] + [1.2x(l/s)x(Tra- Tsa)] which becomes [1.2x(l/s)x(Toa-Tsa)] = Total sensible heat of 100% outside air Quark Your first equation can be modified as OASH = 1.2x(l/s)x(Tma-Tra) where l/s is flowrate of fresh air. Quark...
  3. NNACons

    Q: Using Carrier's Method...

    But, why isn't it: OASH = 1.08*cfm*(Toa-Tsa)? Where Tsa = supply air temp, which is what the air has to be cooled down to? No you are confusing two important things. 1) OASH = 1.2x(l/s)x(Toa-Tra) where rm = room conditions. 2) RSH = 1.2 x (l/s)x (Tma-Tsa) where ma = mixed air on conditions...
  4. NNACons

    HAP: basement wall input

    Using HAP i would deal with your scenario in the following manner. Basement 1 - shares a common floor / ceiling with Basement 2 and common floor / ceiling with Ground level. I would treat Basement 1 floor and ceilings as partions, in fact i would treat all walls this way too, just choosing for...
  5. NNACons

    Can A Room Be a Return Plenum?

    CuriouslyGeorge, I have a few concerns with the system you have described. Firstly, computer room units tend to be cooling only systems which also provide humidification and dehumdification to the space in an attempt to provide close tolerance db and humidity control. Firstly i would check to...
  6. NNACons

    Lieberts

    ChasBeans1, Im from Sydney Australia, so im more familiar with Australian Standard requirements. Specifically AS1668.2 - mechanical ventilation for indoor air quality. Should be a derivative of ASHRAE ventilation standards (from experience). Anyway, for a computer room where the number of...
  7. NNACons

    multi-thermostate in one zone

    If you have zoned your buildings A/C correctly so that the multiple units are all serving a similiar zone ie all units provide heating and cooling to west perimeter zone, and taken that the different areas within this zone have similiar internal loads and usage, similiar outside air proportions...
  8. NNACons

    Lieberts

    Any space including computer rooms requires ventilation air of sorts in addition to the required cooling. This is as per ashrae or AS1668.2 - ventilation and fresh air requirements (australia). My take on this whole thing, is that as per HVAC68 where, "close-control units or precision units"...

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