Flue Gas Temperature And Boiler Efficiency; A Flue Gas Temperature; Boiler Efficiency - Buderus Logano GE315 Technical Manual

2 Technical description
2.4.3

Flue gas temperature and boiler efficiency

The flue gas temperature is the temperature measured
inside the flue pipe, specifically at the boiler flue outlet. It
is shown subject to the boiler load.
Logano GE315
η
[%]
K
100
b
95
90
a
85
80
20 30 40 50 60 70 80 90
0 10
Fig. 15 Flue gas temperatures and boiler efficiency of
the Ecostream cast iron boilers and Ecostream
cast iron boiler units Logano GE315, at an
average boiler water temperature of 70 °C
Logano GE515
η
[%]
K
100
b
95
90
a
85
80
20 30 40 50 60 70 80 90
0 10
Fig. 16 Flue gas temperatures and boiler efficiency of
the Ecostream cast iron boilers and Ecostream
cast iron boiler units Logano GE515, at an
average boiler water temperature of 70 °C
16
ϑ
[°C]
A
190
170
150
130
110
90
70
100
ϕ
[%]
K
6 720 644 097-14.1il
ϑ
[°C]
A
190
170
150
130
110
90
70
100
ϕ
[%]
K
6 720 644 097-15.1il
6 720 646 864 (12/2010) - Technical guide Logano GE315, GE515 and GE615
Logano GE615
η
[%]
K
98
97
b
96
95
a
94
93
92
91
90
10 20 30 40 50 60 70 80 90
0
Fig. 17 Flue gas temperatures and boiler efficiency of
the Ecostream cast iron boilers and Ecostream
cast iron boiler units Logano GE615, at an
average boiler water temperature of 70 °C
Key to Fig. 15, Fig. 16 and Fig. 17:
ϑ
Flue gas temperature
A
η
Boiler efficiency
K
ϕ
Boiler load
K
a Flue gas temperature
b

Boiler efficiency

ϑ
[°C]
A
200
150
100
50
0
100
ϕ
[%]
K
6 720 644 097-16.1il