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Dickinson Marine Antarctic Manual

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www.dickinsonmarine.com ~ info@dickinsonmarine.com
Form#7.2-229 Issue#2
6
able to get your heater without sooting. A CO alarm should be installed in
the boat. We also recommend the Dickinson high heat shut-off #02-210.
4. How Does the Chimney affect the Heater?
The heater does not create the draft for a natural draft appliance to operate; it
is the chimney that creates the draft for operation. The purpose of a chimney
is to take the combustion products (smoke and gasses) from the appliance to
the atmosphere outside your boat, and at the same time, to draw air in for
combustion into the appliance. This movement of combustion air and
exhaust is called draft.
In essence, it is the difference in pressure between the air inside the chimney
flue and the outside air that creates this movement. Warmer, lighter gases in
the flue will move upward.
To keep the pressure conditions favorable, we need a tall column of warm
air inside the chimney, and cooler air outside. The warm air will tend to rise,
drawing the exhaust from the appliance out. As air exits the chimney, fresh
air for combustion is drawn into the appliance. The stronger the upward draft
in the chimney the more likely you won’t experience downdraft.
Important Factors of the Chimney
Since draft is a measure of pressure, chimney draft is affected by pressure
conditions in the boat. Several factors come into play:
1. Adequate air. First, there must be adequate air movement into the
boat to make up for the air exiting through the chimney. If the boat is
very tightly insulated, the volume of air drawn up the flue will exceed
the volume of air entering the boat, and the boat will gradually
become depressurized. With lower pressure in the boat than outside,
there will be a tendency for air to be drawn back into the boat from all
available openings including down the chimney.
2. Air movement in the boat. Second, air movement in the boat must
not interfere with the chimney. As air flows out through the one
window, air is drawn from another to replace it. This is called the
stack effect, since the boat acts like a stack, or chimney. If the stack
effect is powerful enough, it will overcome the chimney's upward
draft and pull replacement air (and smoke) into the boat through the
chimney.
… 6 …


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