User Manual

4
Siemens A6V10564480_en--_-g
Building Technologies 2020-05-05
Flow diagram DN20
Δp
max
= Maximum permissible differential pressure over the ball valve (flow and return), valid for the
entire positioning range of the ball valve rotary actuator unit:
Δp
v100
= Differential pressure over the fully opened ball valve (flow and return) and over the control
path at a volume flow V
100
V
100
= Volume flow through the fully opened ball valve
100 kPa = 1 bar ≈ 10 mWS
1 m
3
/h = 0.278 l/s water at 20 °C
Example on sizing
Sizing:
Design Determining volumetric flow Selection of orifices
Q
H
= 2.8 kW Heating: 1.0
ΔT
H
= 6 K Cooling: 2.5
Q
K
= 2.4 kW
ΔT
K
= 2 K
Δp
v100
= 20 kPa
ϱ
Water
= 1000 kg/m
3