A recent analysis of your gas-fired boiler showed that you have 30 percent excess combustion air. Discussion

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A recent analysis of your gas-fired boiler showed that you have 30 percent excess combustion air. Discussion with the local gas company has revealed that you could use 10 percent excess air if the burner’s controls were better adjusted. This represents calculated efficiency improvements of 8 percent.

a. What would be the change in the flue gas temperature (due to better controls) if the current temperature is measured to be 600°F?

b. How large an annual gas bill before adding a maintenance person for the boiler alone is justified if this person would cost $35,000/year?

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