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2. THEORETICAL NOTIONS FOR THE INSTALLATION
2.1 PELLETS
The pellet is obtained by processing the sawdust produced
during working wood and timber (dried wood and paint free). The
compactness of the material is guaranteed by the lignin which is
contained in the wood itself and allows the production of pellets
without the use of glues or binders.
The market offers different types of pellets with characteristics
that vary based on mixtures of wood used. The diameter varies
between 6 and 8 mm, with a standard length between 5 and 30
mm. The pellets of good quality has a density ranging from 600
to more than 750 kg/m
3
between 5 % and 8 % of its weight.
In addition to being an environmentally friendly fuel, as you push
the limits of wood residues resulting in a cleaner - burning than
that produced with fossil fuels, the pellets also have technical
advantages. While a good wood has a calorific value of 4.4 kW/kg
(15 % RH, after 18 months of seasoning), the pellet is 4.9 kW/kg.
To ensure good combustion, and no power problems, it is impera-
tive that the pellets are stored in a dry place, protected from dirt,
and the thermo stove is placed in a place where the conditions
are the same, not to generate the same type of problems on the
power pellets in the tank. The pellet is usually supplied in 15 kg
bags, so storage is very handy.
A good quality pellet ensures good combustion lowering harmful
emissions into the atmosphere.
If the fuel is poor, the more often cleaning inside the grate and the combustion cham-
ber will be required.
The main certifications of quality for pellets in the European market are DINplus and ÖNorm M7135; these
ensure respect of:
● Calorific power: 4.9 kW/kg
● Water content: max 10 % of weight
● Percentage of ashes: max 0,5 % of weight
● Diameter: 5 - 6 mm
● Length: max 30 mm
● Contents: 100 % untreated wood, with no added bonding substances (bark percentage 5 % max)
● Packaging: in sacks made from ecologically compatible or biologically decomposing material
with a water content that is maintained
[ EN ● 6 ]
Version: 2.0
KEN002PW18 25.11.2019
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