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6.3 Design example regulating insert and by-
pass
From heating surface design
Line 4:
m
Design flow of heating water
H
Is imported from the surface heating
design.
Line 5 + 6: L
Pipe length per heating circuit
H
L
Length of connection pipe
A
Are imported from the surface heating
design
Line 7:
L
Total pipe length per heating circuit
R
L
= L
+ L
R
H
A
Regulating insert design
Line 8:
R Pipe resistance at m
To be determined with the help of the
pressure loss chart of the corresponding
pipe (chart 3 for Oventrop pipes)
Line 9:
p
Pressure loss within the pipework
R
at m
H
p
= R · L
R
R
Line 10:
p
Pressure loss at heating circuit
V
distributor/collector
To be taken from the corresponding pressure
loss chart (chart 1). Starting variable is m
Pressure loss to be taken from the "max."
characteristic line (valve fully opened).
Line 11:
p
Total pressure loss per heating
ges
circuit
p
= p
+ p
ges
R
Line 12:
p
Pressure loss to be throttled per
D
heating circuit
Select the highest total pressure loss in line
11, which is
p
room "office").
p
= p
– p
D
max
Line 13:
VE
Settings of the regulating insert
R
Intersection point of m
pressure los chart of the distributor/collector
(chart 1).
16
H
V
(here 203 mbar in the
max
ges
and ∆p
in the
H
D
Bypass design
Line 14:
f
By
Determination of the proportion of the design
flow of heating water passing through the
bypass when the valve is closed.
Normally this proportion is 25 .
(As no basic heat load is required for the
"office" in this example, the proportion is
0 . This room is no longer considered in
the sequel. The bypass inside the valve for
this circuit is closed.)
Line 15:
m
By
f
By
m
=
By
100
Line 16:
R
By
To be determined with the help of the pres-
sure loss chart of the corresponding pipe
(chart 3 for Oventrop pipe).
Line 17:
p
By,R
pipe work at m
p
= R
By,R
Line 18:
p
By
To be taken from the pressure loss chart
bypass (chart 2). Starting variable is m
Pressure loss to be read from the "max."
characteristic line (bypass fully opened).
Line 19:
p
.
ges,By
H
per circuit
p
= p
By,ges
Line 20:
p
ges,By
throttled
Select the highest total pressure loss in line
19, which is p
room "kitchen").
p
= p
By,D
Line 21:
VE
By
Intersection point of m
pressure loss chart of the bypass (chart 2).
Bypass proportion related to m
Bypass flow rate
· m
H
Pipe resistance at m
By
Pressure loss inside the
By
· L
By
R
Pressure loss bypass
Total pressure loss bypass
+ p
By,R
By
Pressure difference to be
(here 21 mbar in the
By,max.
– p
By,max
By,ges
Settings of the bypass
and p
By
H
.
By
in the
By,D
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