Procedure To Refer Burner Operating Condition At An Altitude And/Or At A Combustion Supporter Air Temperature Different To The Standard Values (328 Ft Above Sea Level, 68 °F); Minimum Furnace Dimensions - Riello RS/M Series Installation, Use And Maintenance Instructions

3.6.1 Procedure to refer burner operating condition at an altitude and/or at a combustion 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.)
3.7

Minimum furnace dimensions

The firing rates were set in relation to certified test boilers.
Fig. 3 indicates the diameter and length of the test combustion
chamber.
D2919
Technical description of the burner
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
Example
Using the Tab. E, for an altitude of 3,000 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 cor-
rect output will be equal to:
Qburner = Qfoc / F = 4,500 / 0.908 = 4,956 Mbtu/h
Example:
Output 2579 MBtu/hr:
diameter 24 inch - length 6.6 ft
Diameter (inches)
11 GB
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
Tab. E
Fig. 3
20160778