A combustion efficiency test done on a gas-fired boiler indicated that the stack temperature is 750°F and the CO2 content is 7 percent. (a) Determine the excess combustion air and the boiler efficiency. (b) The boiler efficiency is increased to 83 percent by adjusting the fuel-air ratio so that the excess air is limited to 30 percent. Estimate the new stack temperature and the CO2 content.

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