\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,
  quality step=0.1,
  quality color=blue!55!black,
  quality boundary color=blue!80!black,
  isotherm color=red!65!black,
  isentrope color=teal!70!black,
  isentrope style={line width=0.25pt,densely dotted},
  temperature preset=refrigeration,
  entropy preset=refrigeration,
  labels=true,
  sloped labels=true,
  quality label every=2,
  isotherm label every=2,
  isentrope label every=2,
  quality label pos=0.45,
  isotherm label pos=0.16,
  isentrope label pos=0.70
]
\end{document}