An isenthalpic process is a thermodynamic process in which the enthalpy of the system remains constant. In other words, during an isenthalpic process, there is no change in the total heat content, expressed as \( H = U + PV \), where \( H \) is the enthalpy, \( U \) is the internal energy, \( P \) is the pressure, and \( V \) is the volume of the system.
Articles by others on the same topic
An isenthalpic process preserves enthalpy for a fixed amount of material, or preserves specific enthalpy between inlet and outlet when comparing a flowing fluid of fixed composition. It need not preserve temperature or entropy. An insulated throttle satisfying the steady-flow energy balance assumptions is an important example.