Useful Information About Firing And Fireplaces; Afterburner/Secondary Combustion - Nordpeis N-24 round Installation & User Manual

Useful information about firing and fireplaces

Heating and air distribution
We separate between radiation heat and convection heat. Convection heat arises in the airspace be-
tween the inset and the concrete surroundings. Cold air is sucked in through the lower air inlet vents in
the surrounding. This air is heated by the inset and due to the expanding of the air it raises and blows
out of the upper air outlets in the concrete surrounding. This hot air circulation result in a well distrib-
uted heat in the house. Optimal location of a fireplace is close to centre of the house.
Radiation heat is the heat one can feel coming through the glass when standing in front of a fireplace.

Afterburner/secondary combustion

Modern fire insets are optimized to be extreme energy efficient and at the same time cause minimal
air pollution. That is why they use less fire wood to produce the same amount of heating as older fire-
places, and also produce less ash.
Insets from Nordpeis perform an after burning of the flue gas. The combustive process is executed
in two steps: First there is a conventional fire in the fire wood. Then there is a secondary combustion
when preheated extreme hot air mixes with the flue gases from the first combustion and a new pure
combustion takes place.
When burning 1-kilo dry fire wood approximately 0.2 kilos disappear as steam, 0.6 kilo disappear as
flue gases and 0.2 kilo is left behind as charcoal. Those 0.6-kilo of flue gases contain only half of the
theoretical energy in the fire wood. The other half is bound in the charcoal.
To achieve an optimal combustion the temperature in the inset must be 600-800°C. The best way to
achieve this is to put less fire wood on the fire more often! If one put too much fire wood on the fire,
the amount of air is insufficient to provide a fire of high enough temperature, and the flue gases will
disappear uncombusted throughout the chimney.
This is why it is important to provide the fire with more air after new fire wood is put to the fire, to en-
sure a flash over in the flue gases.
Use smaller split wood instead of larger. This gives a more effective and a cleaner combustive.
Only pure fire wood is approved as fuel for fire insets from Nordpeis.
Burning garbage harms the environment Use only pure fire wood!
16