Procedure To Refer Burner Operating Condition At An Altitude And/Or At A Combustion Supporter Air Temperature Different To The Standard Values - Riello RL 28/M Electrical Installation, Use And Maintenance Instructions

APPENDIX - PROCEDURE TO REFER BURNER OPERATING CONDITION AT AN ALTITUDE AND/OR AT A COM-
BUSTION SUPPORTER AIR TEMPERATURE DIFFERENT TO THE STANDARD VALUES (328 FT ABOVE SEA
LEVEL, 68 °F).
Altitude Altitude bar. press. bar. press.
ft a.s.l. m a.s.l. "w.c.
0 0
328 100
1.000 305
2.000 610
3.000 915
4.000 1.220
5.000 1.525
6.000 1.830
7.000 2.135
8.000 2.440
F - Correction factor of discharge head and delivery in relation to temperature and altitude.
Reference conditions:
–
Air temperature 68 °F (20 °C)
– Barometric pressure 394 ''w.c. (1000 mbar)
– Altitude 328 ft a.s.l. (100 m a.s.l.)
Example
Using the , for an altitude of 3000 ft and an air temperature of 68 °F, an F factor value is obtained equal to 0.908;
if the capacity at the boiler furnace is Qfoc = 4.500 Mbtu/h, the correct output will be equal to:
Qburner = Qfoc / F = 4.500 / 0.908 = 4.956 Mbtu/h
0
mbar 32
399 1013.00 1.087
394 1000.00 1.073
385 977.40 1.049
371 942.80 1.012
358 908.20 0.975
345 875.80 0.940
332 843.50 0.905
320 811.85 0.871
307 779.80 0.837
294 747.80 0.803
AIR TEMPERATURE
5 10 15
41 50 59
1.068 1.049 1.031
1.054 1.035 1.017
1.030 1.012 0.994
0.994 0.976 0.959
0.957 0.940 0.924
0.923 0.907 0.891
0.889 0.873 0.858
0.856 0.841 0.826
0.822 0.807 0.793
0.788 0.774 0.761
16
20 25 30
68 77 86
1.013 0.996 0.980
1.000 0.983 0.967
0.977 0.961 0.945
0.943 0.927 0.912
0.908 0.893 0.878
0.876 0.861 0.847
0.844 0.829 0.816
0.812 0.798 0.785
0.780 0.767 0.754
0.748 0.735 0.723
40 °C
104 °F
0.948
0.936
0.915
0.883
0.850
0.820
0.790
0.760
0.730
0.700