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It is best to burn wood quickly to obtain the most heat from it. A slow, smoky fire can lose as much as a 3rd of the heat in the fuel. For effective combustion, the fire must get enough oxygen. A tall smoke stack, a mechanical draft fan, or both are typically used to make sure that the draft (flow of air into the firebox) is appropriate.

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If air is required into the combustion chamber too fast, it tends to "burn out" the fire. The outcome is much the exact same as too little air. Forcing excessive air into the combustion chamber can likewise result in puffing. Puffing is in fact a series of explosions that arise from the violent blending of air and wood gases.

The extreme heat from the coals can repel big volumes of flammable gases that periodically spark as oxygen appears. These surges rarely trigger any damage to the system however the resulting backfire can trigger burns and flying ashes. Many substances are formed during the combustion of wood. More than 160 different ones have actually been identified in the smoke alone.

Although these substances will burn at reasonably low temperatures, most of the staying substances released, such as smoke and tar, will not burn totally until the temperature reaches more than 1,000 F. Thus, a hot firebox is needed for complete combustion. In most properly designed hot-water systems the firebox is surrounded by water.

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The water keeps the firebox walls reasonably cool, which leads to excellent heat transfer however does not promote good combustion. For Check Here For More is necessary to insulate the walls and flooring of the firebox with firebrick. The firebrick slows the motion of heat far from the fire and thus increases combustion performance.

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Although the red brick is not quite as effective, it costs about one-fifth as much as white firebrick. Figure 1 shows a cross-sectional view of a common hot-water heating system. It is very important that a water-jacketed combustion chamber be developed large enough. It should be sized not only to accept a charge of fuel however likewise to enable space for the expanding combustion gases to be completely burned before they lose excessive heat and pass into the firetubes.