21
Calculation of load losses for split pipe
flue system
- for each metre of duct Ø 80 (both air intake
and flue gas outlet) the load loss is 2 Pa;
- for each Ø 80 90° elbow with wide radius
(Radius=Diameter), the load loss is 4 Pa;
- for the Ø 80 L = 0.5 m horizontal air intake
terminal, the load loss is 3 Pa;
- for the Ø 80 L = 0.6 m horizontal outlet
section, the load loss is 5 Pa;
- for the Ø 80 splitting device the load loss is
12 Pa.
NB: The above mentioned values refer to
installations made using FONDITAL
approved spare part non-flexible and
smooth ducts.
Calculation sample:
- 26 mt Ø 80 pipe x 2
= 52 Pa
- 2 Ø 80 wide radius 90° elbows x 4
= 8 Pa
- splitting device Ø 80
= 12 Pa
- horizontal Ø 80 air intake terminal
= 3 Pa
- horizontal Ø 80 outlet terminal
= 5 Pa
Tot. load loss
= 80 Pa
3.2.10 Measuring combustion efficiency
(Type A accessories)
Coaxial ducts
To determine combustion efficiency the
following measurements must be made:
- combustion air measurement in hole 2 (see
pic. 16).
- flue gas temperature and CO
2
measurement
in hole 1 (see pic. 16).
Make these measurements when the boiler
is functioning.
(Type B accessories)
Split ducts
To determine the combustion efficiency the
following measurements must be made:
- combustion air measurement in hole 2 (see
pic. 16).
- flue gas temperature and CO
2
measurement
in hole 1 (see pic. 16).
Make these measurements when the boiler
is functioning.
pic. 15
pic. 16
Flue
Analyser
probe
Analyser
probe
Analyser
probes
Air
Summary of Contents for NIAS BTN 28
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