Unit assembly
36 © robatherm
Underpressure siphon
Pressure calculation, intake side
Sample calculation for heating coil (A)
This pressure and the associated siphon height apply only to the heating coil (A).
Always use the final pressure loss to calculate the filter pressure loss.
External pressure on the intake side E.g.: -100 Pa
Pressure loss Filter component E.g.: -250 Pa
Pressure loss Silencer E.g.: -15 Pa
Pressure loss Cooling coil E.g.: -100 Pa
Pressure loss Heating coil E.g.: -20 Pa
Total:
p
1
= -485 Pa
Table 1: Pressure calculation for underpressure siphon
This pressure is used to calculate the siphon height for the underpressure siphon (on
the intake side) at the heating coil (A).
Siphon height calculation for the underpressure siphon (on the intake side)
C Free discharge at atmospheric
pressure
Fig. 46: Underpressure siphon
This is a sample procedure for calculating siphon height. Use the specific heights of
siphon manufacturers (see siphon data sheet).
The siphon height for an underpressure siphon is determined as follows:
H
1
[mm] = p [Pa] / 10
H
S
[mm] = p [Pa] x 0.075
p [Pa] Maximum internal pressure on the intake side of the respective component
H [mm] = H1 + HS
(Sample calculation for heating coil (A) p
1
= -485 Pa)
H [mm] = H
1
+ H
S
= p [Pa] / 10 + p [Pa] x 0.075
H = 485/10 + 485x0.075 = 85 [mm]
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