Using a Flue Gas Analyzer or any meter designed to measure oxygen or carbon-monoxide, and taking the flue gas temperature and the temperature of the combustion air, the following Table can be used to determine combustion efficiency when operating on natural gas. The Temperature Column is the NET Difference between Flue Gas and Combustion Air
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What is the difference between net combustion efficiency
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Boiler efficiency and combustion efficiency - All boilers operate under the same fundamental thermodynamic principles and therefore, just like any other piece of thermal transfer equipment, knowing the log mean temperature difference (LMTD), in this case, between the furnace temperature and the flue gas outlet then the theoretical efficiency can be calculated.
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The efficiency (heat output/gross input) is 94.4%. The heat output divided by the net heat input expressed as a percentage is 105%. This manufacturer has been helpful in giving both gross and net figures so we know where we are. These days, often only net input is given, without being stated as such, so daft figures like our 105% can be obtained.
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Improve Your Boiler's Combustion Efficiency
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Typical boiler efficiencies range from about 90% for the best solid biomass fuel boilers to close to 95% for oil- and natural gas-fired boilers, Table 3.2. The main reason for the poorer performance of biofuels is the high moisture content of the fuel, which increases flue gas losses. Table 3.2.
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Industrial Boiler Efficiency Calculation & Factors
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measurements indicate an excess air level of 44.9% with a flue gas minus combustion air temperature of 400°F. From the table, the boiler combustion efficiency is 78.2% (E1). Tuning the boiler reduces the excess air to 9.5% with a flue gas minus combustion air temperature of 300°F. The boiler combustion efficiency increases to 83.1% (E2).
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Room-sealed, standard efficiency gas boilers can put about 80% of the total energy into your home and lose about 20% via the flue; their gross efficiency is about 80%. (Open-flued, standard efficiency boilers are less efficient.) Before condensing boilers, even the most efficient room-sealed boilers couldn't get much past 83% gross efficiency.
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