Hi,
Their respective circuit include the main loop, so they are oversized in the sense that zone TDH + main circuit loop.
i.e,
Main loop head = 10 Bar,
Zone 1 head = 15 Bar
Zone 2 head = 20 Bar
Zone 3 head = 25 Bar
Pump Duty
Zone 1 Pump = 25 Bar
Zone 2 Pump = 30 Bar
Zone 3 Pump = 35 Bar...
I hear you. But saying the system will "simply balance out" can't sink in. These pumps are sized and run at different head. Also note that there is no re-circulating pump on the main which is typical for a secondary/tertiary arrangement.
I've drawn up the pressure diagram and it just doesn't...
Pump speed will be based upon the diferential pressure setting on each zone. Each zone has multiple AHUs and FCUs with PICV. Load requirement for each zone goes down, pump speed ramp down.
The issue here is the imbalance on each point where the flow/pressure on each zone meets.
Hi,
Thank you for your response. Imbalance will occur when a zone goes on part load. VFD will ramp down the pump therefore there will be a point where two return line meets at different pressure.
Hi,
Does anyone have any experience on installing a distributed zone pumping arrangement? How do you solve the imbalance on your system when your zone pumps is at part load? I'm thinking balancing valves would be tricky as you need multiple differential pressure on your main. I've attached some...
