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Reduced efficiency by intermittent boiler operation
The boiler combustion efficiency is reduced by
- energy losses in the flue gas during operation - either by unburned fuel
with the excess of fuel or by heating more air than necessary with
the excess
of air
- radiation and convection loss from the exterior surface of the boiler during
constant or intermittent operation
The energy loss due to radiation and convection
will increase with intermittent operation and reduced combustion time as expressed in the diagram
below:

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Related Topics
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Combustion
- Boiler house topics - fuels like oil, gas, coal, wood - chimneys, safety valves, tanks - combustion efficiency
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