Combustion Efficiency is the ratio of heat released during combustion to heat released if the fuel is burned completely. This means it is a measure of how well an industrial or commercial burner is burning fuel and converting it into heat. This efficiency is usually expressed as a percentage and calculated by measuring the oxygen content in the combustion gas.
On the other hand, Modified Combustion Efficiency (MCE) takes into account the presence of unburned fuel and carbon monoxide in the exhaust gases. This is important because unburned fuel and carbon monoxide are pollutants that need to be minimized for both safety and environmental reasons. MCE is calculated by measuring the oxygen, carbon dioxide, and carbon monoxide content of the exhaust gases and is usually expressed as a percentage.
In summary, while both Combustion Efficiency and Modified Combustion Efficiency are measures of how effectively fuel is burned, MCE also takes into account the level of pollutants produced during the combustion process, making it a more comprehensive measure of combustion efficiency.