In the Steam Tables, which calculation corresponds to total enthalpy?

Total enthalpy in the context of steam tables refers to the combination of both the enthalpy of the fluid at a given temperature and pressure (Hf) and the enthalpy associated with the phase change from liquid to vapor (Hfg). Specifically, Hf represents the enthalpy of the saturated liquid, while Hfg represents the enthalpy change that occurs during the vaporization process.

By summing Hf and Hfg, one obtains the total enthalpy of the saturated vapor (hence the correct choice). This total enthalpy is crucial for various calculations in thermodynamics, such as evaluating the energy efficiencies of cycles involving heat transfer and refrigeration processes. In practical applications, knowing the total enthalpy helps engineers and technicians understand the thermal state of working fluids at different stages of the refrigeration cycle.