To download the Engineering Equation Solver (EES) Professional you must purchase a license from the official developer, F-Chart Software
"Boiler" P_boiler = 1000 [kPa] T_boiler = 250 [C] h1 = enthalpy(Steam, T=T_boiler, P=P_boiler) s1 = entropy(Steam, T=T_boiler, P=P_boiler) download ees engineering equation solver professional
If you are a student or professor, do not pirate EES. Instead: P=P_boiler) s1 = entropy(Steam