Enthalpy is used in the calculation of fuel power

Question

BlackTom AI · Accepted Answer

To begin, consider what enthalpy represents in thermodynamics. Enthalpy is a measure of the total heat content of a system at constant pressure and is central to calculating energy transfer during chemical processes like combustion.
Option: True. In fuel power calculations, we often use the enthalpy of reaction (or the related enthalpy change) to determine the heat released when a fuel combusts. This is because at constant pressure, the heat released equals the change in enthalpy, which directly informs the available thermal energy that can be converted to work or power in engines and turbines. Additionally, enthalpy concepts underpin the use of heating values (higher or lower) that are defined as enthalpy changes during combustion, reaffirming that enthalpy is indeed used in these calculations.
Option: False. This statement would be inaccurate because neglecting enthalpy would ignore the thermodynamic basis of energy release during combustion. While other quantities like internal energy or specific heat can be involved in different contexts, fuel-power calculations at practical, open-system conditions rely on enthalpy changes to account for environmental pressure and phase changes.
Option: If you think about other thermodynamic potentials, they might be relevant in specialized analyses, but for standard fuel power computations, enthalpy change remains the appropriate quantity to quantify heat release and usable energy.
Option: Some texts differentiate between using enthalpy of combustion versus heating value; both are rooted in enthalpy concepts, further supporting that enthalpy is a foundational tool in calculating fuel power.

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Enthalpy is used in the calculation of fuel power

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