Compute derivative of specific heat capacity at constant pressure, low T region
function cp_Tlow_der extends Modelica.Icons.Function; input IdealGases.Common.DataRecord data "Ideal gas data"; input SI.Temperature T "Temperature"; input Real dT(unit = "K/s") "Temperature derivative"; output Real cp_der(unit = "J/(kg.K.s)") "Derivative of specific heat capacity"; end cp_Tlow_der;