Notes on Use
22
Hydromette BL Compact S
4.1.2
Definition: Water content (w)
This term is partially used for indicating the moisture of wood
combustibles and biomasses. It expresses the water mass in % (w)
in relation to the total mass, the so-
called “wet weight”. Water
content (w) is calculated by the following formula:
( )
4.1.3
Calorific Value
To attain a good heating value or calorific value with the lowest
possible emissions, the aim should be wood moisture (u) of under
20% for single ovens without automatic feed. This corresponds to a
water content (w) of less than 17%.
After a year of open-air storage, wood moisture (u) values of about
40% to 50% are attained, and after two years of storage about 20%
to 30%. This depends on the initial moisture, the type of wood and
the storage conditions.
4.1.4
Conversion Table
Conversion of wood moisture (u) to water content (w)
Wood moisture (u) %
100
50
30
25
20
15
10
Water content (w) %
50
33
23
20
17
13
9
