Riello DB 12 LSE C13 A0 FS1 FR Installation, Use And Maintenance Instructions page 30

2.5 Air side pressure drop (taken upstream from the completely open air damper)
60
50
m bar
40
30
20
10
0
Fig. 7
The pressure curves refer to the different adjustment conditions for the combustion head. Refer to Paragraph 5.1.
InIn 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 = 9800 kW - Altitude = 750 m. a.s.l. - Combustive air temperature = 120 °C
From the diagram (curve 3), with an output of 9800 kW, a total pressure drop (head + air damper) is shown of: p
(combustive air at 20 °C 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
8
2000 4000
Burner output Pb
coefficient as indicated in the table below.
c
30 40 50 60
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 = 35 x 1.449 = 50.7 mbar.
20 c
2
CHAPTER Burner description
6000 8000 10000
[kW]
K
c
Air temperature °C
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
D3977
12000 14000
KW
100 120 140 150
1.257 1.325 1.392 1.426
1.273 1.342 1.410 1.444
1.333 1.405 1.477 1.512
1.375 1.449 1.523 1.560
1.418 1.494 1.570 1.608
1.460 1.539 1.617 1.656
1.505 1.586 1.667 1.707
1.544 1.626 1.709 1.751
1.604 1.690 1.776 1.819
1.647 1.736 1.824 1.868
1.709 1.801 1.893 1.939
1.754 1.848 1.942 1.989
1.804 1.901 1.997 2.046
= 35 mbar
20
= 1.449.
c