wood stove fan
Some wood stove fans are electric but these have a couple of drawbacks. They add to the overall cost of running the stove and they can breakdown through constant exposure to high temperatures. A better solution is the self-powered fan which is powered purely and simply by the heat from the stove. This costs nothing and is more energy-efficient.
One way a self-powered stove fan can work is by way of a Stirling engine. Some of the heat from the stove is used to boil water. The steam from the boiling water drives a piston, which turns the blades of the fan. The spinning fan then propels excess heat above the stove into the living space.
Another type of self-powered stove fan relies on the so-called Peltier-Seebeck effect. The fan acts like a big heat sink, drawing heat from the stove up through an aluminum base. Partway up the base is a "peltier cooler." The difference in temperature between the bottom and top of the base causes the peltier cooler to generate low-voltage electricity, which powers the fan's motor. Ecofan manufacture a range of fans, such as the one shown here, that use this principle.
Related categories• WOOD HEATING
• FIRES AND FIREPLACES
Home • About • Copyright © The Worlds of David Darling • Encyclopedia of Science • Contact