Firing Rate; 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) - Riello RS 45/E LN Installation, Use And Maintenance Instructions

3.6

Firing rate

The burner can work in two ways: low and high fire.
MAXIMUM OUTPUT must be selected in area A (Fig. 3).
MINIMUM OUTPUT must not be lower than the minimum limit
shown in the diagram.
Model MBtu/hr
RS 45/E LN
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.
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.)
20026767
Technical description of the burner
kW
341 100
Firing rate for C-UL Canadian Listing (CNL) - 1969 MBtu/hr
bar. press. 0
mbar 32
1013,00 1,087
1000,00 1,073
977,40 1,049
942,80 1,012
908,20 0,975
875,80 0,940
843,50 0,905
811,85 0,871
779,80 0,837
747,80 0,803
The firing rate area values have been obtained con-
sidering an ambient temperature of 68 °F, and an
atmospheric pressure of 394" WC and with the
combustion head adjusted as shown at page 17.
WARNING
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
8
GB
D2787
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
Fig. 3
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