Enthalpy is used to calculate the efficiencies of the water/steam process

Question

BlackTom AI · Accepted Answer

The statement asks about whether enthalpy is used in calculating the efficiencies of a water/steam process.

First, consider what enthalpy represents: it is a thermodynamic property that combines internal energy with flow work (h = u + pV) and is directly tabulated for water and steam at various pressures and temperatures.

Next, in steam power cycles (like Rankine cycles), the performance and efficiency calculations rely on energy balances across components such as turbines, pumps, boilers, and condensers. These energy balances are typically expressed in terms of enthalpies of the working fluid at different states because the mass flow rate multiplied by specific enthalpy change gives the heat transfer or work produced/required.

Thus, we use enthalpy values from steam tables or Mollier (h-s) charts to compute the work output of turbines (Δh at the turbine) and the heat input in boilers (Δh of the boiler feed), which are essential for determining thermal efficiency.

Individual options:
- True: Correct. Enthalpy is indeed the key property used in energy balance calculations to determine efficiencies in water/steam cycles. 
- False: Incorrect. Claiming enthalpy is not used would ignore the standard practice of using h-values to compute work and heat transfers in steam-based efficiencies.

In summary, because the efficiency calculations for water/steam processes hinge on enthalpy changes during phase transitions and across components, the statement is accurate.

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Enthalpy is used to calculate the efficiencies of the water/steam process

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