Our Cleanburning System provides optimal burning and low emissions which, combined with an effective heat exchange system, results in very high efficiency of up to 82% on some of our woodburners .
So how does this work? Three streams of air are directed into the stove to maximise combustion. Air is drawn in beneath the fuel, above the fuel (passing in front of the glass door), and behind the fuel. This hot air improves ignition so that fuel burns more efficiently, leaving less to be released into the atmosphere.
This triple stream technology ensures that air is always directed to the right place. If you’re burning wood then close the primary air once you fire is burning – the air from above, directed into the heart of the fire, enables optimum burning. For brown coal (lignite), open the primary and adjust accordingly, which provides the best conditions for these fuels.
The air stream that passes between the fire and the glass door is particularly important, because it prevents carbon deposits from building up on the glass.
The longer time spent in the combustion chamber by the gases mixed with air will have a positive effect on the burning process. This effective way of burning can be achieved by the primary air flowing from the base of the combustion chamber through the openings of the grate completed by secondary air ("glass flushing" air) with warm tertiary air entering at different heights of the combustion chamber from the sides and rear. This air entering at different levels during the burning process allows unburnt gases to re ignite thus producing more efficiency and much fewer emissions.
The operation principle of our woodburning stoves:
- Primary air
- Secondary air (Airwash)
- Air of the room
- Warm convectional air
- Flue gas
- Heating gas
- Fire grate
- Lining of the fire chamber (Fire bricks)
- Tertiary air (cleanburn)
- Ash pan
The baffled way in which the burning chamber is designed causes these unburnt gases to stay in the fire box longer therefore allowing the tertiary air to mix and re ignite.
The vermiculite lining of the furnace chamber allows higher temperature within the firebox so also helping efficiency.
After this,gases are lead through one or more dead-plates (baffles)in the upper part of the stove to a heat exchange system that is usually consisting of a flue pipe where heat is transmitted again.Waste gas finally leaves the wood stove through the flue outlet and it is lead to the chimney through a connecting pipe where they enter the chimney at a temperature of 230 - 300 ºC depending on the type of appliance, the length of the connecting pipe and the way of connection. This remaining amount of energy provides the necessary additional feed pressure (upward pressure) in the chimney, "the motor of the stove".