In aircraft design and engineering, “change in enthalpy” (ΔH) represents the difference in the total energy per unit mass of a fluid (such as air) before and after a process, like compression or heating. Enthalpy is a thermodynamic property that combines the internal energy of a fluid with the product of its pressure and volume.
The formula for calculating the change in enthalpy can be defined as:
- ΔH (Delta H) is the change in enthalpy, typically measured in joules per kilogram (J/kg) or other energy per unit mass units.
- Final Enthalpy is the enthalpy of the fluid after the process or change, typically measured in joules per kilogram (J/kg).
- Initial Enthalpy is the enthalpy of the fluid before the process or change, also measured in joules per kilogram (J/kg).