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Energy Savings With Use of Preheated Combustion Air Combustion Air Preheat Temperature (Degrees F) 400 500 600 700 800 900 1,000 1,400 10% 13% 16% 18% 20% 22% 25% 1,500 11 14 16 19 21 23 25 1,600 11 14 17 19 22 24 26 1,700 12 15 18 20 23 25 27 1,800 13 16 19 21 24 26 29 1,900 13 16 19 22 25 27 30 2,000 14 17 20 23 26 29 31 2,100 15 18 22 25 28 30 33 2,200 16 20 23 26 29 32 34 2,300 17 21 24 28 31 34 36 2,400 18 22 26 30 33 36 38 2,500 20 24 28 32 35 38 41 2,600 22 26 30 34 37 40 43 Percent Fuel Savings with Use of Preheated Combustion Air Savings - Use of Preheated Combustion Air Current New Furnace flue gas temp. (F) 1,400 1,400 Percent O2 (dry) in flue gases 2.10 2.10 %Excessair 9.94 9.94 Combustion air temperature (F) 80 700 Fuel consumption (MM Btu/hr) - Avg. current 10.00 8.14 Available Heat (%) 58.00 71.29 Fuel savings (%) Base 18.64% No. of operating hours 8000 8000 Therms used per year (Therms/year) 800,000 650,843 Thermssaved peryear(Therms/year) Base 149,157 Cost of fuel ($/Million Btu) $ 10.00 $ 10.00 Annual savings ($/year) Base $ 149,157 CO2 savings (tons/year) Base 873 Carbon equivalent savings (tons/year) Base 238 Calculations for N. Gas, 10% Excess air Savings can be calculated by using equations, tables or calculators Copyright: Arvind Thekdi E3M, Inc Waste Heat Recovery November 2, 2011 20 Exhaust Gas Temperature (Degrees F)PDF Image | Waste Heat Management
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