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2.5
Air side pressure drop (taken upstream from the completely open air damper)
Fig. 7
The pressure curves refer to the different adjustment conditions for the combustion head.
Refer to Paragraph 5.1.
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 for DB 3
Burnt output = 3000 kW - Altitude = 500 m. a.s.l. - Combustive air temperature = 200 °C
From the diagram, with an output of 3000 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 200 °C and altitude 500 m. a.s.l., equal to K
The total pressure drop of the burner head is:
p = p
x K
= 23 x 1.691 = 38.9 mbar.
20
c
50
40
30
20
10
0
2000
40
60
80
1.055
1.122
1.190
1.069
1.137
1.205
1.119
1.190
1.262
1.154
1.228
1.302
1.190
1.266
1.342
1.226
1.304
1.382
1.263
1.344
1.425
1.295
1.378
1.461
1.346
1.432
1.518
1.382
1.471
1.559
1.434
1.526
1.618
1.472
1.566
1.660
1.514
1.610
1.707
2
CHAPTER
3000
4000
5000
coefficient as indicated in the table below.
c
K
c
Air temperature °C
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
Burner description
D10412
6000
KW
160
180
200
220
1.459
1.527
1.594
1.662
1.478
1.547
1.615
1.683
1.548
1.620
1.691
1.763
1.596
1.670
1.744
1.818
1.646
1.722
1.798
1.874
1.695
1.774
1.852
1.930
1.747
1.828
1.909
1.990
1.792
1.875
1.957
2.040
1.862
1.948
2.034
2.120
1.912
2.001
2.039
2.177
1.984
2.076
2.168
2.259
2.036
2.130
2.224
2.318
2.094
2.191
2.287
2.384
= 23 mbar (combustive air at 20 °C
20
= 1.691.
c
250
1.763
1.786
1.870
1.928
1.988
2.048
2.111
2.164
2.249
2.310
2.397
2.460
2.529
7
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