Buderus Logano GE615 User Manual

2 Technical description
6 720 646 864 (12/2010) – Technical guide Logano GE315, GE515 and GE615
17
2.4.4 Standby loss and flue gas temperature
The standby loss is part of the rated heat input that is
required to achieve the specified boiler water
temperature.
The cause of this loss is the cooling down of the boiler
through radiation and convection during the standby time
(burner idle time). Radiation and convection result in part
of the output being transferred continuously from the
boiler surface to the ambient air. In addition to this surface
loss, the boiler can also cool down to a lesser degree
through the chimney draught.
Logano GE315
Fig. 18 Standby loss and flue gas temperature of the
Ecostream cast iron boilers and Ecostream cast
iron boiler units Logano GE315, subject to the
average boiler water temperature
Key to Fig. 18, Fig. 19 and Fig. 20:
ϑ
A
Flue gas temperature
ϑ
K
Average boiler water temperature
q
B
Standby loss
a
1
Flue gas temperature at stage 1
(partial load here approx. 60 % of rated output)
a
2
Flue gas temperature at stage 2, full load
b Standby loss
Logano GE515
Fig. 19 Standby loss and flue gas temperature of the
Ecostream cast iron boilers and Ecostream cast
iron boiler units Logano GE515, subject to the
average boiler water temperature
Logano GE615
Fig. 20 Standby loss and flue gas temperature of the
Ecostream cast iron boilers and Ecostream cast
iron boiler units Logano GE615, subject to the
average boiler water temperature
8035
30
0
0,1
0,2
0,3
0,4
0,5
0,6
40
45 50 55 60 65 70 75
200
180
160
140
120
ϑ
A
[°C]
ϑ
K
[°C]
q
B
[%]
6 720 644 097-17.1il
a
2
b
a
1
80
30
0
0,2
0,1
0,3
0,4
40
45 50 55
120
140
160
180
200
60 65 70 75
q
B
[%]
ϑ
A
[°C]
35
6 720 644 097-18.1il
a
2
b
a
1
ϑ
K
[°C]
80
20
0
0,05
0,10
0,15
0,2
30 40 50 60 70
200
180
160
140
120
a
2
b
a
1
6 720 644 097-19.1il
q
B
[%]
ϑ
A
[°C]
ϑ
K
[°C]

Buderus Logano GE615 Specifications

General

Brand	Buderus
Model	Logano GE615
Category	Boiler
Language	English