A significant efficiency impact on burners is the ratio mix of the air and fuel. It represents the ratio of annual heat output compared to the consumed fossil fuel energy. Combustor/burner or afterburner: , Turbine: Nozzle: , . 6. If this 1,900-square-foot home is in Washington, D.C., however, and the furnace you’re looking at has an 80 percent efficiency, the input rating should be 100,000 BTUs. Most homeowners have difficulties figuring out what size of furnace do they need. In the example: 40,000 BTU divided by 1,075 = 37.21. How many BTU furnace would fit your home perfectly? But a furnace with an output of 91,000 BTU/h has an input of 105,000 BTU/h -- so that's an efficiency of 86.6%. Forced-draft burners use blowers to provide pressurized air to oxidize the fuel and to produce different flame patterns. 1 BTU = 1,055 joules, 252 calories, 0.293 watt-hour or the energy released by burning one match. Essentially, there are two types of air/fuel burners: forced draft and natural draft. It may be worth considering a more efficient furnace as less energy will be used to achieve the same heat output. In the burner, heat is released in the combustion process, and the energy equation must be used to determine the temperature change. 11. The British Thermal Unit, or BTU, is an energy unit. Thermal Efficiency. 3 Ideal Ramjet . 11. Understanding furnace efficiency. Inlet/Diffuser: , (adiabatic, isentropic) Compressor or fan: , . Use a Smart Thermostat. Fortunately, calculating furnace size (be it natural gas, propane, or oil) is not rocket science.. To help future furnace owners out, we have developed a simple furnace sizing calculator. To get started with a simple example (no turbomachinery), we will reexamine the ideal ramjet, picking up where we left off in Section 3.7.3. What is a BTU? The performance of a furnace is usually assessed by the following indices. It is approximately the energy needed to heat one pound of water by 1 degree Fahrenheit. Furnaces typically have around an 80 percent efficiency rating, although more expensive, high-energy models have at least a 93 percent efficiency rating. high efficiency gas or oil condensing furnace: 85 - 95 % ; Furnace Performance Indices. 2 Ideal Assumptions. For example, if a furnace has a listed input rating of 90,000 Btu's and an efficiency rating of 80%, it will produce 90,000 Btu input X .80 efficiency … Parameters for Properly Designed and Operated Flares Report for Flare Review Panel April 2012 Prepared by U.S. EPA Office of Air Quality Planning and Standards (OAQPS) For a burner that is 95-percent efficient, divide by 0.95. The efficiency of a furnace is measured by the Annual Fuel Utilization Efficiency (AFUE). 6. If the output is 96,000 BTU/h, those numbers give you an efficiency of 83.5%.. μ t = thermal efficiency. Then, to calculate the output on a given gas furnace, multiply it's efficiency rating by it's listed input rating to determine the actual Btu output of heat. Adjust for the burner efficiency by dividing consumption at 100 percent efficiency by the burner efficiency rating. E o = energy output (W, Btu/h) E i = fuel energy input (W, Btu/h) Annual Fuel Utilization Efficiency - AFUE Calculation of the Air Requirement for Complete Combustion of Fuel Gases Example 1 Calculate the theoretical air-gas ratio at MSC of a fuel gas manufactured by the ICI 500 process containing (by volume) 14.8% CO 2 2.7% CO 48.9% H 2 33.6% CH 4 If the model number of your furnace ends in 115, there's in a good chance that it has an input of 115,000 BTU/h. 1 watt is approximately 3.412 BTU per hour. μ t = 100 E o / E i (1) where . However, if a furnace is rated at 100,000 BTUs and is 92% efficient, then the heat output will be 92,000 BTUs (100,000 × .92). 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