Unical DUA plus, Инструкция по установке и эксплуатации пользователя

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18
Installation info
Example N.2
Primary air intake from an outer wall and
smoke evacuation through the same wall.
Maximum allowed pressure drop: 50 Pa
fig. 17
CALCULATION OF PRESSURE LOSS
FOR DISCHARGE & SUCTION
DUCTS
Bear in mind the following parameters
when calculating pressure losses:
- for each metre of duct with Ø 80 (both
suction and discharge) the pressure loss
is 2 Pa;
- for each 90° Ø 80 (R=D) bend with long
radius, the pressure loss is 4 Pa;
- for the Ø 80 L = 0.5 m horizontal air inlet
terminal, the pressure loss is 3 Pa;
- Ø 80 L = 0.6 m horizontal discharge end
section, the pressure loss is 5 Pa;
NB: These values refer to discharges
through original UNICAL non-
flexible and smooth ducts.
In both of the following examples
the hypotized compositions of the
intake and evacuation ducts are
possible because the total pressure
loss is lower than 50 Pa, which is
the maximum allowed pressure loss.
Example of check using wide radius
bends:
- 15 m duct Ø 80 x 2 = 30 Pa
- 2x90° Ø80 long radius bends 2x4= 8 Pa
- horizontal Ø 80 air inlet terminal = 3 Pa
- horizontal Ø 80 terminal = 5 Pa
Total pressure loss = 46 Pa
135
45
250 min.
Example N.2
fig. 18
2.2.9 - ON SITE COMBUSTION
EFFICIENCY MEASUREMENT
(Type A accessories))
Coaxial ducts
To determine combustion efficiency the
following measurements must be made:
- the combustion air temperature measured
in hole
2 (see fig. 18).
- the flue gas temperature and CO
2
%
measured in hole 1 (see fig. 18).
Make these measurements with the
boiler running in a steady state
condition.
(Type B accessories))
Separate ducts
To determine combustion efficiency the
following measurements must be made:
- the combustion air temperature measured
in hole
2 (see fig. 18).
- the flue gas temperature and CO
2
%
measured in hole 1 (see fig. 18).
Make these measurements with the
boiler running in a steady state
condition.
A
B
Analyser
probes
2
1
Analyser
probes
1
2
Smokes
Air