PPT Slide
- H=U+PV, defined as total enthalpy
- H=mh, h=u+Pv, specific enthalpy will be an intensive property
- It is an important property in many situations, for example, the steady flow process, h=u+P/? is a measure of the combined internal energy and the pressure work
- It is also useful when one considers phase transition: Example: when liquid water vaporizes into water vapor, its internal energy changes from uf to ug. At the same time, itsa specific volume also changes from vf to vg, going through an expansion process; and it does work. Therefore, the total combined change of the energy will be from hf=uf+pvf to hg. Their difference hfg=hg-hf is called the latent heat of vaporization at the given temperature/pressure.