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Enthalpy calculation with Cp

Enthalpy calculation with Cp

We can calculate the energy difference between two states of different temperature if we know the heat capacities.

When the pressure is constant, integration of ({ C }_{ p }) with respect to temperature gives the energy changes upon temperature change within a single phase. This energy change under constant pressure is called sensible heat. Since we can only calculate the energy difference between two states, the concept of a reference state where the zero enthalpy is assigned might be particularly useful. Then the enthalpy of a material at a certain state is not an absolute term but the enthalpy difference from the reference state. For compounds, heat of formation is assigned for the convenience in tabulation.

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Thermodynamics in Energy Engineering

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