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4.10
Air side pressure drop (measured upstream of the damper with complete opening)
The pressure curves refer to the combustion head adjustment
conditions.
In the event that the supplied air has a temperature greater than
20°C and/or an altitude greater than 100 m. a.s.l., the pressure
drops of the head shown in the diagram are multiplied by the co-
efficient K
indicated in the Tab. E.
c
Example:
Burnt output = 25000 kW - Altitude = 750 m. a.s.l. - Combustion
air temperature = 120 °C
40
35
30
25
20
15
10
5
0
2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 22000 24000 26000 28000 30000 32000
Altitude
m. a.s.l.
0
20
0
0.920
0.988
100
0.932
1.000
500
0.976
1.047
750
1.007
1.080
1000
1.038
1.114
1250
1.069
1.147
1500
1.102
1.182
1750
1.130
1.213
2000
1.174
1.260
2250
1.206
1.294
2500
1.251
1.343
2750
1.284
1.378
3000
1.320
1.417
Technical description of the burner
Burner output - kW
30
40
50
1.021
1.055
1.089
1.034
1.069
1.103
1.083
1.119
1.155
1.117
1.154
1.191
1.152
1.190
1.228
1.186
1.226
1.265
1.223
1.263
1.304
1.254
1.295
1.337
1.303
1.346
1.389
1.338
1.382
1.427
1.389
1.434
1.480
1.425
1.472
1.519
1.465
1.514
1.562
From the diagram (Fig. 5), for an output of 25000 kW, the total
pressure drop obtained at the head is equal to: p
(combustion air at 20 °C and 100 m. a.s.l. altitude).
A multiplicative coefficient can be found on the table, for combus-
tion air at 120 °C and at 750 m. a.s.l., equal to Kc = 1.449.
The total pressure drop of the burner head is:
p = p
x K
= 15.8 x 1.449 = 22.9 mbar.
20
c
K
c
Air temperature °C
60
70
80
1.122
1.156
1.190
1.137
1.171
1.205
1.190
1.226
1.262
1.228
1.265
1.302
1.266
1.304
1.342
1.304
1.343
1.382
1.344
1.384
1.425
1.378
1.419
1.461
1.432
1.475
1.518
1.471
1.515
1.559
1.526
1.572
1.618
1.566
1.613
1.660
1.610
1.659
1.707
11
GB
20133847
90
100
120
1.223
1.257
1.325
1.239
1.273
1.342
1.298
1.333
1.405
1.338
1.375
1.449
1.380
1.418
1.494
1.421
1.460
1.539
1.465
1.505
1.586
1.502
1.544
1.626
1.561
1.604
1.690
1.603
1.647
1.736
1.664
1.709
1.801
1.707
1.754
1.848
1.755
1.804
1.901
= 15.8 mbar
20
Fig. 5
140
150
1.392
1.426
1.410
1.444
1.477
1.512
1.523
1.560
1.570
1.608
1.617
1.656
1.667
1.707
1.709
1.751
1.776
1.819
1.824
1.868
1.893
1.939
1.942
1.989
1.997
2.046
Tab. E
20126147
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