What is meant by "boiler efficiency" in the context of power engineering?

Boiler efficiency refers to the effectiveness with which a boiler converts the energy in the fuel it consumes into useful work, typically measured in terms of energy output in relation to the energy input. This is mathematically expressed as the ratio of useful energy output—such as steam or hot water produced—to the total energy input from fuel combustion. A higher efficiency indicates that more of the energy content in the fuel is being converted into usable energy rather than lost, which is a key consideration in power engineering.

Understanding this concept is crucial for engineers, as improving boiler efficiency can lead to better energy utilization, reduced operational costs, and lower emissions, all of which are essential for the sustainable operation of power plants and other industrial systems that rely on boilers for heat generation or steam production.