Brochure

5
One cause of problems in air handling units can be unbalanced
hydronic components, which leads to over-pumping and increased
energy consumption. AC drives enable lower pump speeds but must
maintain ‘nominal’ pressure if the system is manually balanced. The
Danfoss solution is AB-QM, the Pressure Independent Control Valve,
that allows pump speed to be matched to demand. Proportionally
reducing pump speed with ow rate, is only possible with PICVs.
Manually balanced systems would experience ‘starvation’ near the
pump. For even higher eciency, the pump speed can be further
optimized if dp sensor feedback is used.
Eortless reduce pumping
energy consumption
Pressure drop across
control valve
AB-QM with AC drive
avoid this waste
Pressure drop across
manual balancing valve
Pressure drop across
heat exchanger
Pressure drop across
supply piping
Pump running costs
50%
Q ow rate
Pressure
P
non
P
Additional saving
with DP sensors.
Using AB-QM with AC
drive avoids this waste.
100%