\documentclass[border=3mm]{standalone}
\usepackage{luacoolprop}
\pgfplotsset{compat=1.18}
\pgfplotsset{auto node allow outside=true,
  auto node failure mode=hide-low-priority}

\begin{document}
\LCPPHDiagram[
  fluid=R134a,
  isotherm=true,
  isentrope=true,
  isochore=true,
  quality step=0.1,
  temperature preset=refrigeration,
  entropy preset=refrigeration,
  specific volume preset=refrigeration,
  labels=true,
  sloped labels=true,
  quality label every=2,
  isotherm label every=2,
  isentrope label every=2,
  isochore label every=2,
  quality label pos=0.45,
  isotherm label pos=0.16,
  isentrope label pos=0.70,
  isochore label pos=0.58
]
\end{document}