Derivative of pressure with regards to temperature, at constant v
function dPressureVap_dTemperature_Tv input Modelica.Units.SI.Temperature T "Temperature of refrigerant"; input Modelica.Units.SI.SpecificVolume v "Specific volume of refrigerant"; output Real dpdT(final unit = "Pa/K") "Derivative of pressure with regards to temperature"; end dPressureVap_dTemperature_Tv;