For a boiler, the general energy equation relating heat transfer to enthalpy change is which of the following?

Study for the EPRI Heat Transfer and Fluid Flow Test. Prepare with flashcards and multiple choice questions, each with hints and explanations. Get ready for your exam!

Multiple Choice

For a boiler, the general energy equation relating heat transfer to enthalpy change is which of the following?

Explanation:
In a boiler, the energy put into the fluid goes into increasing its specific enthalpy as it changes from state 1 to state 2, with no shaft work and negligible changes in kinetic or potential energy. The steady-flow energy balance (per unit mass) is q = h2 − h1, so the heat added to the fluid equals the enthalpy rise. This makes q = h2 − h1 the correct form. The other options would either add the enthalpies together or put the opposite sign, which doesn’t reflect the positive heat input that raises the fluid’s enthalpy.

In a boiler, the energy put into the fluid goes into increasing its specific enthalpy as it changes from state 1 to state 2, with no shaft work and negligible changes in kinetic or potential energy. The steady-flow energy balance (per unit mass) is q = h2 − h1, so the heat added to the fluid equals the enthalpy rise. This makes q = h2 − h1 the correct form. The other options would either add the enthalpies together or put the opposite sign, which doesn’t reflect the positive heat input that raises the fluid’s enthalpy.

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