code: def Hfr(self, Hfr):
          
  
          self._Hfr = Hfr
          self._T = self._calculate_T(Hfr)
docs: Set the enthalpy flow rate of the stream to the specified value, and
          recalculate it's temperature.
  
          :param H: The new enthalpy flow rate value. [kWh/h]