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  1. Cry24

    Pumps with Built-in VFD's

    Great discussion, Thank you very much for your inputs
  2. Cry24

    Maintaining Positive Pressure inside an Office Area

    Provide space pressure sensor that would modulate RA/OA dampers to achieve space pressurization set point.
  3. Cry24

    Pumps with Built-in VFD's

    Pedarrin2 Speaking of ASHRAE 90.1, 5 HP or less motors are not required to have VFD's, the savings being questionable. Most domestic water pumps have a much lower motor HP. Say a 2HP pump will hardly save you any money at all. i.e. no pay back can be achieved. The other thing is: Booster pumps...
  4. Cry24

    Aggregated Campus (Building & Utility) Efficiency against fixed baseline (Ambient,load,demand,et

    Most HVAC software can provide such a graph in energy modeling. It gives you a profile for the year, month by month. Get your HVAC guy to model the building (Trace 700, Carrier E20II; Energy Plus, Equest) and fairly simple to get what you're looking for.
  5. Cry24

    Pumps with Built-in VFD's

    Wow, thanks for the pitch guys. I run into a VA hospital situation (doing a facility assessment) and they had 17 domestic water pumps with built-in VFD (Grundfos brand). They had a power outage that resulted into 16 of their 17 VFD's failure. They had to replace all 16 pumps. a by-pass would...
  6. Cry24

    Pumps with Built-in VFD's

    Hi all Does anyone have experience with pumps with built-in VFD's? I suspect a few draw-backs in specifying these. 1. How does the pump react to pressure? does it have built-in PD or is PD provided by others near the pump? can it read multiple PD's far away? ASHRAE 90.1 require remote PD's, not...
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