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 RLS 280/E Installation, Use And Maintenance Instructions

3.8.1 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.
ft a.s.l.
m a.s.l. "w.c.
0
0 399
328
100 394
1.000
305 385
2.000
610 371
3.000
915 358
4.000
1.220 345
5.000
1.525 332
6.000
1.830 320
7.000
2.135 307
8.000
2.440 294
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.)
3.9

Minimum furnace dimensions

The firing rates were set in relation to certified test boilers.
Fig. 6 indicates the diameter and length of the test combustion
chamber.
1 5 . 7
29.6
23.0
16.5
13.2
9.9
6.6
3.3
1.6
MBtu/hr 760
20106891
Technical description of the burner
0 5
bar. press.
32 41
mbar
1013,00 1,087 1,068
1000,00 1,073 1,054
977,40 1,049 1,030
942,80 1,012 0,994
908,20 0,975 0,957
875,80 0,940 0,923
843,50 0,905 0,889
811,85 0,871 0,856
779,80 0,837 0,822
747,80 0,803 0,788
Diameter (inches)
3 1 . 5
1 9 . 7 2 3 . 6
1.5 7.5
1000
14
AIR TEMPERATURE
10 15 20
50 59 68
1,049 1,031 1,013
1,000
1,035 1,017
1,012 0,994 0,977
0,976 0,959 0,943
0,940 0,924 0,908
0,907 0,891 0,876
0,873 0,858 0,844
0,841 0,826 0,812
0,807 0,793 0,780
0,774 0,761 0,748
Example
Using the , 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 RLS 510/E:
Output 19200 MBtu/hr: diameter 39.4 inch - length 16.5 ft.
i nc hes
3 9 . 4 4 7 . 2
ft= 0,12
11.3 18.9 22.7
37870
GB
25 30
77 86
0,996 0,980 0,948
0,983 0,967 0,936
0,961 0,945 0,915
0,927 0,912 0,883
0,893 0,878 0,850
0,861 0,847 0,820
0,829 0,816 0,790
0,798 0,785 0,760
0,767 0,754 0,730
0,735 0,723 0,700
D9396
f t
MBtu
hr
40 °C
104 °F
Tab. H
Fig. 6