Specification
6 720 645 817
(2010/09)
31
2.7
Flue gas temperature
The flue gas temperature
ϑ
A
is the temperature captured
inside the flue pipe, specifically at the boiler flue outlet.
It depends on the return temperature.
Fig. 18 Flue gas temperature subject to boiler return
temperature (average for this series of boilers)
ϑ
A
Flue gas temperature
ϑ
Return temperature
1
Full load
2
Partial load
2.8
Conversion factor for alternative
system temperatures
In the tables containing the technical details of the
Suprapur gas condensing boilers, the rated output
figures relate to system temperatures 50/30 °C and
80/60 °C.
Take a conversion factor into account when calculating
the rated output at different system temperatures.
Fig. 19 Conversion factor for deviating design return
temperatures (average of this series of boilers)
f
Conversion factor
ϑ
Return temperature
Example
For a Suprapur gas condensing boiler with a rated
output of 120 kW at a system temperature of 50/30 °C,
the rated output should be calculated at a system
temperature of 80/60 °C.
At a return temperature of 60 °C, a conversion factor of
0.935 results. At 80/60 °C, the rated output is therefore
112.2 kW.
30
35
40
45
50
55
60
65
70
30
40
50
60
70
2
1
80
75
ϑ
A
[°C]
ϑ
[°C]
6 720 642 877-07.1il
0,93
0,94
0,95
0,96
0,97
0,98
0,99
1,00
30
35
40
45
50
55
60
f
ϑ
[°C]
6 720 642 877-08.1il
