0
10
1
2
3
4
5
fresh wood
dry wood
Graph of the dependence of the fuel and the calorific value
% h
2
O
20
30
40
50
60
70
80
90
100
kWh/kg
FiG.
4
07
2.4. STORAGE OF WOOD FUEL
it is recommended to store wood for ideally 2 to 3 years in well ventilated and
dry area. optimally, wood is recommended to be stored to the southern part of
the house on a grid to provide a fow of air and good ventilation of wood. we
recommend to cover the top of the wood to protect against rain (fig. 3). in this
way, humidity of 15–18 % will be achieved.
Under no circumstances should you use fresh wood. Fresh wood has humidity of
approximately 60 % and a caloric capacity less than 2 kW/h per 1 kg (Fig. 4). To
create the same volume of heat energy would require twice the volume of fuel.
Moreover, when using fresh wood, the fireplace insert does not achieve the
optimal burning temperature, efficiency and low emissions of pollutants. Burning
wood with high humidity excessively overloads the fileplace insert and rapidly
shortens its service life. In the case of repeated burning of wet wood, the insert or
parts of the insert can be damaged! This will also block the chimney and increase
the risk of fire in the soot in the chimney.
2.5. RECOMMENDED DOSE OF FUEL
Doses of wood fuel used in the fireplace insert must vary between the maximum and minimum
stated value (see table). If adding another batch of fuel than that stated, the fireplace insert can
be damaged, become less efficient and the emission values are increased. The fireplace insert is
designed for short-term combustion operation. The interval for adding fuel should vary within
the range 45-60 minutes.
Note: 1 kg hard wood with 18% humidity corresponds to one 30 cm long piece of wood with a
diameter of 10 cm. During burning this quantity of wood releases approximately 4 kW/h of
energy, therefore, adapt the doses to the energy demands of your house.
Note: 1 kg hard wood with 18% humidity corresponds to one 30 cm long piece of wood with a
diameter of 10 cm. During burning this quantity of wood releases approximately 4 kW/h of
energy, therefore, adapt the doses to the energy demands of your house.
30 cm
10 cm
