TECHNICAL FEATURES AND DIMENSIONS
6
2.4.
Fuel
The ECOWOOD series is designed for use with solid fuel of biogenic or fossil nature. This means
different types of natural wood, solid residues of organic nature coming from trees or agricultural
plants, wood briquettes of various types. Carbon or other similar fossil fuels are allowed, but
only in combination with wood and maximum 20% volume ratio at every load. If you want to
use solely carbon as fuel, please contact the manufacturer.
Good quality wood is oak, ash, beech, maple, olive tree and fruit trees, except cherry. Medium
quality wood is chestnut and birch. Low quality wood is poplar and willow.
The nominal characteristics of the boiler are calculated for use on wood!
Table 1.
Calorific power of different types of wood
Every type of wood contains a significant amount of humidity, which highly affects its combustion
behavior and calorific value. Boiler output, efficiency and autonomy will significantly diminish as
the humidity increases. The nominal data presented in this manual are calculated for humidity
content 15%.
For proper and efficient function and a long lifespan, it is strictly recommended that only dry
wood is used, with a humidity content of 15%. Practically, this means at least one year dry
wood. Maximum humidity content allowed is 25%.
As understood, wood is an extremely heterogeneous fuel, due to different essences, different
humidity contents, shapes and dimensions. This is why the combustion behavior highly varies
through time and average data as fuel consumption, autonomy, and output are very difficult to
forecast.
It is prohibited the use of laminated wood, or other chemically treated wood. It
It is prohibited the use of explosive, inflammable materials, plastic, domestic
residues, etc.
0
10
20
30
40
50
60
2,2 2,8 3,4 3,7 4,0 4,3 4,6 4,8 5,1
H
umi
di
ty
[%
]
Lower Calorific Power [kWh/kg]
Calorific power in relation to humidity
Fuel
Calorific power
kWh/kg
kcal/kg
Oak
4,2
3.600
Beech
4,0
3.450
Birch
4,3
3.700
Poplar
4,1
3.500
Pine
4,4
3.800
Spruce, Fir
4,5
3.900
Wood briquettes
4,0 – 4,9 3.600 – 4.200
Carbon
Anthracite
5,6 – 6,5 4.800 – 5.600
Coal
4,5 – 6,4 3.900 – 5.500
Brown carbon
2,7 – 4,2 2.300 – 3.600
Lignite
1,6 – 3,8 1.400 – 3.300
