\documentclass{article}
\usepackage[margin=18mm]{geometry}
\usepackage{luacoolprop}
\pgfplotsset{compat=1.18}
\pagestyle{empty}

\begin{document}
\LCPPTDiagram[
  fluid=R134a,
  temperature axis unit=celsius,
  pressure axis unit=bar,
  isentrope=true,
  entropy values={1.4,1.7,2.0},
  isenthalp=true,
  enthalpy values={200,300,400},
  isochore=true,
  specific volume values={0.001,0.01,0.1},
  axis options={width=16cm,height=10cm}
]
\end{document}

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