I need to build a H-xy diagram of water-ammonia in Hysys. I have found some diagrams in the internet. According to this diagram enthalpy of water is higer than enthalpy of ammonia. I tried to build this diagram in Refprop, I got the same diagram. But I have to use Aspen Hysys. In Aspen Hysys enthalpy of water is -15472.98 kJ/kg, enthalpy of ammonia is -4134.58 kJ/kg. So I can see that enthalpy of water less then enthalpy of ammonia (at the same pressure, vapor fraction =0). Why I get this result? Maybe I made a mistake?

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