User Manual

5
More on
saving energy
with PICVs
More on
hydronic
balancing
Do it right:
Dynamic hydronic balancing
Hydronic balancing means, the right amount of water at the right time in the right place.
Sounds easy! But is it? There are several solutions, but one is definitely the right way to do it.
Hydronic balancing with
standard control valves
To create a balanced hydronic system
with standard control valves you must
first determine design flow rates and
calculate the pressure losses across the
whole hydronic network. Then you deter
-
mine a valve type, size and proper flow
coefficient. In the next step you need to
make sure that the selected valve has
sufficient control authority for the job.
After that, you also need to calculate and
select a manual balancing valve for this
consumer. You must repeat this process
for all consumers and 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 net
-
work operates at part load, the system is
no longer balanced and runs inefficiently.
This leads to high costs and energy con-
sumption that could be avoided. Also,
the room’s comfort is impaired because
pressure fluctuations have an impact on
the room’s temperature.
Not an optimal solution although it is still
widely used.
Hydronic balancing with
dynamic valves
Using dynamic valves, such as PICV or
Intelligent Valves, in your HVAC system
the valves do the balancing for you. There
is no need for complex pressure loss and
control authority calculations. Only the
volumetric flow determines which valve
must be used. You also don’t need any
additional flow regulating or balancing
valves, which means less installation
effort. On-site commissioning is extremely
simple thanks to easy max flow presetting
and automatic balancing. This is possible
because dynamic valves ensure balanced
water flow rates under all load conditions,
thereby eliminating any impact of fluctua
-
tions on the room temperature. This way,
dynamic valves allow for energy savings
of up to 30 percent with no sacrifice of
comfort. With Intelligent Valves you can
even save up to 37 percent.
In other words: Dynamic balancing is
the right way to do hydronic balancing.
Benefits of dynamic hydronic balancing
• No need for complex hydronic calculations
• Fast and easy product selection
• Fewer components, less installation effort
• Effortless commissioning
• Automatic dynamic hydronic balancing
• High comfort
• Energy savings of up to 37 percent
Static hydronic balancing: Uneven energy
distribution under part load conditions.
Dynamic hydronic balancing: The hydronic
system is always balanced, independent of
load conditions and pressure fluctuations.