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Recent content by Drazen

  1. Drazen

    Commercial Kitchen Hood Makeup Air

    What you call compensating hood usually don't have all the makeup delivered at the hood, but the large portion of it, which makes a saving and sense of using it. There is no issue of cold draft as this concept uses syphonic effect to accelerate exhaust effectiveness. Yet you do need some level...
  2. Drazen

    Package Units

    Manufacturer's documentation should give you the answer. Unit couldn't be legally released to the market without clear instructions on that.
  3. Drazen

    Condenser Units Start / Stop

    Should be triggered on/off by pressure switches, while set points need to slightly differ so that individual units go on/off one by one.
  4. Drazen

    return duct entry to plenum

    willard already gave you the answer, air distribution will certainly be uneven. the question is whether there will be any sensible consequences or not. commissioning may show some performance issues, but besides that there can be uneven supply temperature if FCU blows into long supply grille...
  5. Drazen

    Carrier HAP Hybrid Heat Pumps

    The kind of company I always fight with, and avoid whenever I can. I opened several pdf brochures, as the operating explanation carries little sense to me, to find out lot of bulldog pictures, few product photos, and not a single schematic diagram, and not any, even the most basic...
  6. Drazen

    How to find a good technical consultant

    Tech support issue is much related to the overall quality level of vendor, manufacturers who care much about their brand would be sensitive to client dissatisfaction with tech support. I had lot of such problems, but you need to describe specific problem to allow any advice.
  7. Drazen

    Engineering Manager considering PMP Cerficiation - Is it worth it?

    A long time ago I was considering the same, but after many years I daresay PMP is good marketing label for IT or corporate finance projects, where there is lot of excess money, while specific measuring of management effectiveness is lacking. That is, imho, PMP is in no way compatible with...
  8. Drazen

    VRV Selection and new EU F-Gas Reductions

    That is something fire authorities will have to deal with, decisions go much beyond scope of designer. In theoretical plan, R-410a will stay in use for larger systems, while R-32 is planned for use in smaller systems, which are usually tied to buildings with lower fire risk, like small...
  9. Drazen

    cooling load Diversity

    For cooling load you don't apply diversity factor but you calculate it. If you have peak loads that should mean you have hourly loads as well, and you should summarise your loads for each hour, find largest sum, and that would make your diversity.
  10. Drazen

    Aircon HP salesman is asking

    Don't be convinced, check first! Japanese and Korean guys, for instance, sometimes have different habits compared to US/Europe as regard to units used.
  11. Drazen

    20L/s kitchen cooker hood / extractor

    That seems to be minimum requirement per code, but it's not sufficient for your hood to actually work. There are geometrical requirement as regards to kitchen equipment working area, but even more important fume calculation for kitchen equipment. Simplified, if you would really put some hood...
  12. Drazen

    Outdoor Air Handler - Condensate Drain Insulation/Heat Trace?

    Unfortunately we cannot have terms agreed easily as many newbies post on the forum, now I'm unsure whether "outdoor air handler" refers to unit that treats outdoor air (which would be first implication) or it is just clumsy expression for outdoor unit which serves air handler. Here is quite...
  13. Drazen

    Outdoor Air Handler - Condensate Drain Insulation/Heat Trace?

    "Tipically" there will be no condensate from indoor units at all if spaces are not cooled during outdoor minus temperatures.
  14. Drazen

    design fees as function of construction cost

    If you have so large budget overrun, tightening consultant's fees is last thing to do in order to establish budget control. Their cost ratio compared to total budget is much lower than is the influence and importance of consultants in budget control. That is typical business-destruction...
  15. Drazen

    Heat pump customiztion

    Again, such ideas make sense only if they are based on deep understanding of thermodynamics, and this is what is entirely missing here, apparently, and the fact that you volunteer to charitable organisation makes things even worse if you would burn money into something complex, sophisticated...
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