20140894
12
GB
Technical description of the burner
Example
Delivery Q = 19 kg/h - Comb. chamber press. H1 = 5 mbar
Delivery reduction 5%
Qr = 19 x 0,95 = 18 kg/h - H1r = 5 x (0,95)
2
= 4,5 mbar
4.7
Test boiler
The firing rates were set in relation to special test boilers in ac-
cordance with the methods defined in EN 267 standards.
Fig. 6 indicates the diameter and length of the test combustion
chamber.
Example:
delivery 25 kg/hour:
diameter = 50 cm; length = 1 m.
Whenever the burner is operated in a much smaller commercial-
ly-available combustion chamber, a preliminary test should be
performed.
kg/h
B
mbar
4,6
5,7
23
21,1
5
5,5
6,1
A
mbar
kg/h
C
4,5
22,3
4,7
5,8
Fig. 5
D389
*
**
air 20 °C - altitude 1000 m a.s.l. - F = 0.898
*
Qe = Q : F = 19 : 0.898 = 21,1 kg/h
5 mbar A
H2 = 6.1 mbar
H3 = H2 x F = 6.1 x 0.898 = 5.5 mbar
H3 > H1 (5.5 > 5) OK
air 30 °C - altitude 1600 m a.s.l. - F = 0.808
*
Qe = Q : F = 19 : 0.808 = 23 kg/h
5 mbar B
H2 = 5,7 mbar
H3 = H2 x F = 5.7 x 0.808 = 4.6 mbar
H3 < H1 (4.6 < 5)
IMPOSSIBLE
Qe = Q : F = 18 : 0.808 = 22.3 kg/h
4.5 mbar
C
**
H2 = 5.8 mbar
H3 = H2 x F = 5.8 x 0.808 = 4.7 mbar
H3 > H1 (4.7 > 4.5)
OK
Fig. 6
D449
Combu
s
ti
on
chamb
e
r
leng
th
m
Summary of Contents for PRESS 1G
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