Contents - Index



HigherHeatingValue [kJ/kg, kJ/kmol, J/kg, J/kmol, Btu/lbm Btu/lbmol] returns the specific higher heating value  of the specified substance at a reference temperature of 25C (77F).  The units of the value returned by this function depend on the user settings of the unit system. This function is implemented for ideal gases, the NASA gases (that contain only carbon, hydrogen, and oxygen) and organic incompressible fluids.


The HigherHeatingValue function requires only one argument and that is the name of the substance.  The function is not applicable for real fluids or brines.


The value of the higher heating value depends on the phase of the fuel.  The value returned by this function assumes that that the phase is what it would be at the reference temperature and standard atmospheric pressure.  Any water formed in the combustion process is assumed to be in the liquid state.




$UnitSystem SI kJ molar

HHV_CH4=HigherHeatingValue(CH4)  {higher heating value of gaseous methane}

HHV_C2H5OH=HigherHeatingValue(C2H5OH) {higher heating value of liquid ethanol}

HHV_propanol=HigherHeatingValue('n-Propanol') {higher heating value of n-propanol (Incompressible fluid library)}

HHV_isooctane=HigherHeatingValue(C8H18,isooctane) {higher heating value for isooctane in the NASA library}



HHV_C2H5OH=1.367E+06 [kJ/kmol]

HHV_CH4=890643 [kJ/kmol]

HHV_propanol=2.021E+06 [kJ/kmol]

HHV_isooctane=5.496E+06 [kJ/kmol]



Thermophysical Property Functions