The boiler combustion efficiency increases to 83.1% (E2). Assuming a fuel cost of $8.00/MMBtu, the annual savings are: Annual Savings = Fuel Consumption x (1–E1/E2) x Fuel Cost = 29,482 MMBtu/yr x $8.00/MMBtu = $235,856 Flue Gas Analyzers The percentage of oxygen in the flue gas can be measured by inexpensive gas-absorbing test kits.
Table 1 illustrates the amount of fuel a . typical small boiler consumes, compared with the capital cost of the boiler, burner, and controls. The data in . Table 1. are based on natural gas at $10 per MMBtu and heating oil at $3.63 per gallon ($0.97 per L). It becomes apparent that when operated at a 25% capacity factor, a boiler will consume at
Natural Gas Fired Boilers - innovativecombustion.com
Although older furnace and boiler systems had efficiencies in the range of 56% to 70%, modern conventional heating systems can achieve efficiencies as high as 98.5%, converting nearly all the fuel to useful heat for your home.
Remember, the fuel price should not be the sole measure for selecting a heating appliance. To use the formula below, remember to use a decimal for the appliance heating efficiency you are assuming (see Table 2). You must first convert the Btu content of the fuel per unit to millions of Btu by dividing the fuel's Btu content per unit by 1,000,000.
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Base model - Values represent a 1,000,000 Btu/hour gas-fired, hot-water boiler operated for 1,500 full-load hours per year with a thermal efficiency of 80%. The performance of this standard unit is based on ASHRAE 90.1-2007. Thermal efficiency (E t) - Represents a boiler's energy output divided by energy input as defined by ANSI Z21.13. A boiler's thermal efficiency rating should be used to determine …