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## Q. 8.1

A flue gas analysis of an oil fuel-fired boiler indicates that the $CO_{2}$ content is 11 percent with a gas flue temperature of 343°C (650°F). Determine the overall thermal efficiency of the boiler. Use oil No. 2.

## Verified Solution

By reading the monograph of Figure 8.4, the combustion occurs with excess air of 38 percent and excess $O_{2}$ of 6 percent. The overall boiler thermal efficiency is about 78 percent.