User Manual

PICVs – the right way
The advantages that PICVs offer are obvious, as this comparison shows
Static hydronic balancing with standard
control valves
Dynamic hydronic balancing with PICVs
Uneven energy distribution under part
load conditions results in less comfort
and higher energy consumption.
The hydronic system is always balanced,
independent of load conditions and pres-
sure fluctuations. A high level of comfort
throughout the building and lower energy
consumption.
1. Determine volumetric flow (V
100
)
and calculate pressure losses across
the whole hydronic network
2. Determine nominal flow rate (k
VS
) of
the valve, valve type, and nominal size
3. Ensure the valve has the necessary
control authority (P
V
)
4. Calculate manual balancing valve and
flow regulating valves
5. Repeat this process for all consumers
6.
Commission the whole system by manually
adjusting the position of all balancing valves
Now the system is balanced. But it is only
statically balanced, which means that as soon
as your hydronic distribution network operates
at part load, which it usually does, the system
is no longer balanced and runs inefficiently.
1. Determine volumetric flow (V
100
)
2. Determine the right PICV
3. Determine maximum volumetric
flow preset and set on the PICV
4. Repeat this process for all consumers
Now the system is dynamically balanced,
which means it stays balanced independently
of load conditions.
Why is it important to have the system
balanced at all times? Comfort and energy
efficiency: A balanced system eliminates
any impact of fluctuations on the room
temperature. This way, dynamic valves
allow for energy savings of up to 30 percent
with no sacrifice of comfort.
More on
hydronic
balancing
[°C] [°C]
Room temperature T
R
Setpoint
[°C] [°C]
Room temperature T
R
Actual value
[kPa] [kPa]
Differential pressure
fluctuations ∆p
[%] [%]
Stroke H
Time
[m
3
/h]
Time
[m
3
/h]
Volumetric flow V
Room controlled with standard control valve Room controlled with PICV
3