Pressure sensors locaiton for Variable pumping
Pressure sensors locaiton for Variable pumping
(OP)
I have a variable pumping system with 2 port valve arranagment on all the air handling unit coils for a chilled water system. The pipe run is over 300m with branches to different building every 30 meters. Where should i position the differential pressure sensor for controling the variable speed dirve of the pump? Should it be before the first branch take off or at the end of line or elsewhere?





RE: Pressure sensors locaiton for Variable pumping
Good on ya,
Goober Dave
RE: Pressure sensors locaiton for Variable pumping
RE: Pressure sensors locaiton for Variable pumping
RE: Pressure sensors locaiton for Variable pumping
RE: Pressure sensors locaiton for Variable pumping
I used to locate the sensor 2/3 between first and last take-off but on one project had an issue with starving the end AHU's at part load conditions. The pipework distribution on that specific project was complex and loads highly variable but ever since then have always put the DP sensor at the end without an issue.
If you really want to optimise energy consumption you should use an algorithm to automatically reset the differential pressure setpoint as low as possible.
But if you have different buildings I think you will potentially have problems maintaining acceptable pressures in all buildings and you should be considering tertiary pumping to each building, or look differential-pressure-control-valves serving each individual building.