HigherHeatingValue
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 25 C (77 F). 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 solutions.
The value of the higher heating value depends on the phase of the fuel. The value returned by this function assumes 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.
Examples:
$UnitSystem SI kJ molar
$Load Incompressible
$Load NASA
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}
{Solution
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]
}