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2-56 E The steam requirements of a manufacturing facility are being met by a boiler whose rated heat input is 5.5 x 10 Btu/h. The combustion efficiency of the boiler

is measured to be 0.7 by a handheld flue gas analyzer. After tuning up the boiler, the combustion efficiency rises to 0.8. The boiler operates 4200 ha year intermittently.Taking the unit cost of energy to be $13/10° Btu, determine the annual energy and cost savings as a result of tuning up the boiler.

Fig: 1