Wood Moisture Content And Calorifi C Value; Storing And Drying Wood; Cleaning And Maintenance; Steel Cladding - HASE Ottawa Mode D'emploi

result is a fi ne white ash. Dark colouration indicates that
the ash contains charcoal residue; in this case, the burn-
off phase was incomplete.
– The colour of the fl ue gases emitted at the chimney pot
Here, the following applies: the more invisible the fl ue
gases exiting the chimney, the better the combustion
quality.
During the transitional seasons (spring/autumn), outdoor
temperatures above 16°C can impair the chimney draught. If
a draught cannot be created at these temperatures by rapidly
burning paper or thin wood shavings (quick fi re), you should
refrain from lighting the stove.
25. Wood Moisture Content and Calorifi c Value
Rule of thumb: the more damp the wood, the lower the
calorifi c value.
The calorifi c value of the wood depends largely on the wood
moisture content. The more
moisture the wood contains, the more energy expended to
evaporate it during the combustion
phase; this energy is then lost. The more damp the wood, the
lower its calorifi c value.
An example: freshly cut wood has a moisture content of
approx. 50% and a calorifi c value of around 2.3 kWh/kg;
in contrast, wood which has been effi ciently air-dried has
a moisture content of approx. 15% and a calorifi c value of
around 4.3 kWh/kg.
Accordingly, if you burn very moist wood, you will have about
half the thermal output with the same quantity of wood.
Furthermore, burning moist wood results in substantial soot
66
build-up on the fi re box window. Moreover, when moist wood
is burned, the resultant water vapour can condense in the fl ue
pipe or chimney, which can lead to a build up of shiny soot
on the chimney or chimney creosote. Chimney creosote can
cause unpleasant odours and damage brick chimneys, while
shiny soot poses a fi re hazard (chimney fi re). In addition,
if the wood has a high moisture content, the combustion
temperature decreases, which prevents complete combu-
stion of all the wood components and causes considerable
environmental pollution.
You can use a wood moisture meter to determine the residual
moisture content of your fi rewood.

26. Storing and Drying Wood

Wood needs time to dry. If stored properly, it will air-dry in
approx. 2 to 3 years.
Saw, split, and store the wood ready for use; this ensures
rapid drying because smaller pieces of wood dry better than
larger, uncut logs.
Stack and store your wood logs in a ventilated location that is
as sunny as possible, ideally facing south, and ensure that the
wood is protected from rain.
Leave a hand's width between the individual piles of wood so
that air can fl ow between them and carry away any escaping
moisture..
Do not cover your wood stacks with plastic sheeting or tarpau-
lins; otherwise the moisture cannot escape.
Do not stack fresh wood in a cellar or basement, since it will
rot rather than dry due to the lack of airfl ow.
Only store already dried wood in dry and well-ventilated cellar
or basement rooms.

27. Cleaning and Maintenance

27.1 Steel Cladding

Hase stoves are coated with a heat-resistant open pore lacquer
that provides only limited corrosion protection; accordingly, a
rust fi lm may develop in some cases.
Do not use any detergents containing acid (e.g. citrus or
vinegar cleaners) to clean the steel parts. The steel parts can
be adequately cleaned by wiping them down with a slightly
moistened cloth.
Avoid using excessive water to clean the fl oor/fl oorplate. Any
water that spills from kettles, boilers, or dishes should be
immediately mopped up.
Do not install the Ottawa in „damp rooms", e.g. conservato-
ries or winter gardens. Do not temporarily store the stove in an
unheated building shell or garage.
NOTE!
Treat areas covered in a rust fi lm with the
original Hase Stove Lacquer Spray. Be sure and
follow the instructions on the spray can. Your
authorised Hase dealer carries the stove
lacquer spray and can give you tips on using it.