Buying Firewood; Drying And Storing Wood; Wood Types And Calorific Value; Units Of Measurement For Wood - TONWERK T-LINE eco2 Instructions D'utilisation

2.3 BUYING FIREWOOD
Where can I get my fi ewood?
BUYING READY­TO­BURN FIRE­
WOOD
Regenerated ready-to-burn fi ewood
can be purchased from dealers:
• s tove-ready, stored for at least two
years
• predried, stored for one year
• fresh from the forest
Every dealer has a wood moisture me­
ter that they use to test the wood they
buy. The ideal residual moisture is
12–15% and should be no higher!
TREATING FIREWOOD YOURSELF
Unseasoned wood can be purchased
from the forestry office owners of
woodland, or the community:
• t runks lying in the forest
• seasoned trunks by the wayside
Whether you have cut your own wood
or bought it, the important thing is:
the wood should be dried for at least
two years before it is burned!
See for further information:
www.hki-online.de/en
2.6 U NITS OF MEASUREMENT FOR WOOD
Solid cubic metre (scm): As its name
suggests, the solid cubic meter corre-
sponds to one cubic metre of solid as
opposed to stacked wood.
Stacked cubic metre (stcm) or stere
(st): A stacked cubic metre or stere
corresponds to one cubic metre of
stacked wood including the gaps be-
tween layers. One stere equals 0.7
solid cubic metres.
2.4 DRYING AND STORING
WOOD
DRYING
The water content of fi ewood has a
great effect on its burning properties.
Your wood should be as dry as pos-
sible. Only then can it give off much
heat and burn without polluting the
environment. Freshly cut wood can
contain between 45 and 60% moisture
depending on the season and type. Af-
ter the optimal drying this water con-
tent drops to below 15%. Depending
on the wood type this can take about
two years, and even longer for some
kinds.
!
Damp wood damages
your fireplace and
reduces efficiency!
STORAGE
If fi ewood is to dry thoroughly, it must
be cut into small pieces.
Check this yourself: the circumference
should be max 20–25 cm. Store the
wood out of doors, protect it from rain
and snow, and make sure it is well ven-
tilated.
!
What you must not
burn: refuse, wet wood,
briquettes!
Loose cubic metre (lcm): The loose
cubic metre is a measure for chopped
firewood that is loosely packaged for
trade and transport. One loose cubic
metre is 0.7 steres or about 0.5 solid
cubic metres.
NOTE THE SPECIFIED UNIT OF
MEASUREMENT WHEN ORDERING!
2.5 WOOD TYPES AND
CALORIFIC VALUE
The calorifi value describes the heat
energy released when one kilogram
of fuel is burned under specifi condi-
tions.
The calorifi value is based on the vol-
ume specifie in stacked or solid cubic
metres.
The various wood types have various
calorifi values:
TREE CALORIFIC VALUE
Hardwoods
beech, oak, locust 2100 kWh/stcm
birch 1900 kWh/stcm
sycamore 1900 kWh/stcm
Softwoods
Douglas fi , pine 1700 kWh/stcm
larch 1700 kWh/stcm
spruce, fi 1500 kWh/stcm
The values are based on 15% residual wood moisture!
A TONWERK STORAGE HEATING
STOVE CAN BE FIRED WITH ALL OF
THE ABOVE WOOD TYPES.
i
The many oils and
resins in larchwood also
provide for an acoustic
fireworks!
1 solid cubic metre – 1 scm
1 stacked cubic metre/
stere – 1 stcm
1 loose cubic
metre – 1 lcm
0.5 fm 0.7fm 1 fm