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2.5
Air side pressure drop (taken upstream from the completely open air damper)
In the case of air supply at a higher temperature than 20°C and/or an altitude higher than 100 m. a.s.l., the pressure drop in the
head that is shown in the graph must be multiplied by the K
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
Example
Burnt output = 9000 kW - Altitude = 750 m. a.s.l. - Combustive air temperature = 120 °C
From the diagram, with an output of 9000 kW, a total head pressure drop is shown of: p
and altitude 100 m. a.s.l.).
The table gives a multiplying coefficient, for combustive air at 120 °C and altitude 750 m. a.s.l., equal to K
The total pressure drop of the burner head is: p = p
Burner output Pb
c
30
40
50
1.021
1.055
1.089
1.122
1.034
1.069
1.103
1.137
1.083
1.119
1.155
1.190
1.117
1.154
1.191
1.228
1.152
1.190
1.228
1.266
1.186
1.226
1.265
1.304
1.223
1.263
1.304
1.344
1.254
1.295
1.337
1.378
1.303
1.346
1.389
1.432
1.338
1.382
1.427
1.471
1.389
1.434
1.480
1.526
1.425
1.472
1.519
1.566
1.465
1.514
1.562
1.610
x K
20
c
2
CHAPTER
[kW]
coefficient as indicated in the table below.
K
c
Air temperature °C
60
70
80
90
1.156
1.190
1.223
1.171
1.205
1.239
1.226
1.262
1.298
1.265
1.302
1.338
1.304
1.342
1.380
1.343
1.382
1.421
1.384
1.425
1.465
1.419
1.461
1.502
1.475
1.518
1.561
1.515
1.559
1.603
1.572
1.618
1.664
1.613
1.660
1.707
1.659
1.707
1.755
= 32 x 1.449 = 46.4 mbar.
Burner description
20075275
100
120
140
1.257
1.325
1.392
1.273
1.342
1.410
1.333
1.405
1.477
1.375
1.449
1.523
1.418
1.494
1.570
1.460
1.539
1.617
1.505
1.586
1.667
1.544
1.626
1.709
1.604
1.690
1.776
1.647
1.736
1.824
1.709
1.801
1.893
1.754
1.848
1.942
1.804
1.901
1.997
= 32 mbar (combustive air at 20 °C
20
= 1.449.
c
7
150
1.426
1.444
1.512
1.560
1.608
1.656
1.707
1.751
1.819
1.868
1.939
1.989
2.046
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