The steam requirements of a manufacturing facility are being met by a boiler whose rated heat input is 3.6*10^6 Btu/h. The combustion efficiency of the boiler is measured to be 0.7 by a handheld flue gas analyzer. After turning up the boiler the combustion efficiency rises 0.8. The boiler operates 1500 hours a year intermittenly. Taking the unit cost of energy o be $4.35/10^6 Btu, determine the annual energy and cost savings as a result of turning up the boiler.
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You would save $2,349 annually and 5.4*10^8 btu.
Take the difference in efficiency which would be 0.1 and multiply that by the heat input. This gives the total difference in boiler output per hour. Multiply by 1,500 hours run time and the $4.35 per MM (million) Btu for your savings.