INSTALLATION & USER MANUAL ENERGY EFFICIENT WOODSTOVE | PHOENIX
4 | Page
Beech
Hard wood is ideal for firewood but requires a high temperature to ignite. It weights a lot; it is dense and burns with a calm and long fire for a
longer time. Best when well seasoned. The same applies for oak, but seasoned for 2-3 years.
The various wood types have various calorific values
Wood type Thermal capacity (Kcal/h-1Kg)
Briquette 5.000
Birch 4.800
Walnut 4.731
Oak 4.619
Beech 4.578
Fir 4.588
Common Oak 4.548
Pine 4.457
Olive 4.100
Poplar
Table 2.4.1
860Kcal/h = 1 kW/h
The values are based on 15% residual wood moisture.
2.5. Determining the heat output
There is not a specific rule that enables the calculation of the required heat output. This depends on the amount of space that is required to
be heated and mostly on its insulation. In average the required heat output for a properly insulated room and with external temperature of 0
ο
is 40 kCal/h per m
3
.
Taking into account that 1kW equals 860 kCal/h an equivalent of 50W/m
3
can be used. For example, to heat a 50 m
3
room (10 x 6 x 2.5m) in
an insulated residence, the output required is 150m
3
x 50W/m
3
= 7500W or 7.5 kW.
So for the main heating, a 10kW appliance is enough.
Indicative combustion value
with efficiency ~80%
Required amount relative
to 1kg dry wood
Fuel Unit kCal kW
Firewood (moisture 15%) kg 3600 4.2
1.00
Firewood (moisture 50%) Kg 1850 2.2
1.95
Wood briquettes Kg 4000 5.0 0.84
Coal briquettes Kg 4800 5.6 0.75
Coal Kg 7700 8.9
0.47
Coke Kg 6780 7.9
0.53
Gas m
3
7800 9.1
0.46
Diesel L 8500 9.9 0.42
Electricity kW/h 860 1.0 4.19
Table 2.5.1
An ARTE
®
wood stove can be fired with all of the above wood types
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