User Manual

26
Valve sizing and actuator selection
Basic hydronic circuit
1
Determine the type
of hydronic circuit
Throttling
circuit
Injection
circuit with
2-port valve
Mixing circuit
Mixing circuit with
xed premixing
Diverting
circuit
Injection
circuit with
3-port valve
For valve sizing
relevant variable
ow path
Δ
p
Primary pump ü Primary pump  Primary pump ü Primary pump 
HVAC plants and consumers
Heating
Surface/oor heating –
n
– –
n n
– outdated
Heating plant (primary) –
n n n n n
outdated outdated
Zone control, heating –
n
– – – – – outdated
Heating groups –
n n n n n
– –
Generation of heat energy – – –
n
–
n
– –
Heat exchanger water-water
n
uncommon uncommon – – – uncommon uncommon
Ventilation and air conditioning plants
Air handling unit
n n n n
– – outdated outdated
Fan coil unit
n
– – – – – outdated outdated
Cooling coil
dehumidifying
n
– – – – uncommon uncommon
Reheating coil
n n
uncommon uncommon uncommon uncommon outdated outdated
Preheating coil –
n
uncommon uncommon uncommon uncommon – outdated
VAV
n
– – – – – outdated outdated
Zone control
n
– – – – – outdated outdated
Chiller plants
Surface/oor cooling –
n
– – – – – outdated
Generation of cooling
energy
– – –
n
–
n
– –
Cooling towers
n
– – – – – outdated uncommon
Zone control, cooling –
n
– – – – – outdated
District heating and cooling
District heating, primary
n
uncommon – uncommon – uncommon – –
District heating, secondary
n n
– uncommon – uncommon – –
District cooling, primary
n
uncommon – uncommon – uncommon – –
District cooling, secondary
n n
– uncommon – uncommon – –
Hot water
Hot water directly –
n
–
n
– – – –
Header
Differential
pressure header
pressurized low-pressure pressureless low-pressure pressureless pressurized
Volumetric ow variable variable constant