@HHV.setter<EOL><INDENT>def HHV(self, HHV):<DEDENT>
self._HHV = HHV  <EOL>if self.isCoal:<EOL><INDENT>self._DH298 = self._calculate_DH298_coal()<EOL><DEDENT>
Set the higher heating value of the stream to the specified value, and
recalculate the formation enthalpy of the daf coal.

:param HHV: MJ/kg coal, higher heating value