Euro-C 4000 RJL-GBEN
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3.4 Compartment dimensions
Figure 4
For horizontal airflow
For vertical airflow
Table 3b
MODEL
Dim. A (mm)
Dim. B (mm)
Dim. C (mm)
4011
310
490
640
4015
410
490
640
4018
480
490
640
4024
480
620
640
4030
550
620
640
4036
696
620
640
4047
836
620
640
4060
696
950
640
4072
836
950
640
4100
900
1800
350
3.5 Maximum airflow condition
Special attention must be given to ensure that the
temperature rise of the air, passing through the
enclosure (duct channel) around the heat exchanger
tubes, is high enough to avoid condensation
forming within the tubes. This condensation
forming could occur by super cooling of the
products of combustion. Such condensation can be
the source of severe corrosion and damage to tubes
or part of the tubes.
Figure 5 indicates the probability of condensation
forming within the tubes reference :
-
the temperature rise of the air through the
enclosure (around the tubes) (see table 3b –
fig. 4)
-
the inlet air temperature passing over the heat
exchanger
In function of the expected minimum inlet air
temperature, the minimum required temperature
rise (to avoid condensation) must be derived from
the chart shown in figure 5.
Example
•
expected minimum inlet temperature = -5°C
•
minimum required temperature rise shown on
the chart = +13°K
Table 1 indicates the heat output (kW) of the
different models.
The maximum allowable airflow
[
through the
enclosure (duct channel) around the tubes
]
can be
calculated as follows :
0,3423
minimum
T
1000
(kW)
input
heat
(m³/h)
max
V
×
×
=
?
Example :
<
Tmin = 13K
model 4072 at 100% heat input : 72,00kW
results into Vmax = 16180m³/h
Remark
:
For air heaters with the option 2 stage gas valve
(50% minimum heat input) or the option
modulating gas valve (30% minimum heat input)
attention must be given to determine the
maximum allowable airflow in function of the
appropriate heat input.
