Can someone please enlighten me, does this mean Direct Expansion or Dry Expansion? I have looked it up and have found both meanings on here and google.

I am trying to understand the Coolpak software, which I hope will help me understand the thermodynamics of the various stages of the refrigeration process (vapour compression cycle), which will eventually allow me to understand my project a bit better ? ?

Would love some help on DX Expansion's real meaning, thank you
James