\documentclass[border=3mm]{standalone}
\usepackage{luacoolprop}
\pgfplotsset{compat=1.18}

\begin{document}
\begin{tikzpicture}
\begin{axis}[
  lcp fluid=R134a,
  width=12cm,height=8cm,
  ymode=log,grid=both,
  xlabel={$h/(\mathrm{kJ\,kg^{-1}})$},
  ylabel={$p/\mathrm{bar}$},
  auto node placement
]
  \LCPAddPHQuality[quality values={0,0.5,1},labels=true]
  \LCPAddPHIsotherms[temperature values={-20,0,20,40,60},labels=true]
\end{axis}
\end{tikzpicture}
\end{document}

.