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Building Technologies
Basic Documentation LMV5...
CC1P7550en
20 Flue gas recirculation (FGR) function (LMV50/LMV51.3/LMV52)
22.05.2018
Only LMV52.4:
Examples of tables showing the damper positions with flue gas recirculation
(FGR)
Table with setting values:
Output
37.5%
62.5%
75%
100%
Flue gas recirculation (FGR) curve
19.3°
25.0°
28.5°
37.0°
Flue gas recirculation (FGR)
temperature
72 °C
105 °C
121 °C
150 °C
The LMV52.4 uses these setting values to calculate a
zero curve
:
Example of flue gas recirculation (FGR) positions calculated by the LMV52.4 for a flue
gas recirculation (FGR) factor of 100%:
Position flue gas recirculation with
T = 0 °C zero curve
15.2°
18.0°
19.7°
23.8°
Example of flue gas recirculation (FGR) positions calculated from the identical setting
values for a flue gas recirculation (FGR) factor of 50%:
Position flue gas recirculation with
T = 0 °C zero curve
7.6°
9.0°
9.8°
11.9°
The above example shows that – with the
zero curve
– a flue gas recirculation (FGR)
factor of 50% leads to a 50% reduction of the damper positions.
The LMV52.4 performs a linear interpolation of the damper positions between the
setting values and the
zero curve
, depending on the current flue gas temperature.
When the flue gas temperatures lie above the setting values, the calculated damper
positions are higher than the setting values.
