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...
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.
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...
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...
