Material Flow Section - HOC

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Material Flow (Qo)	Qxxxx Tab Include Properties						Species Flow	Optional Tabs
Basic Information	Energy ValuesAtUserTandP	Density Correction Solubility Saturation	Acidity Charge Transport	HeatsOfCombustion Heating Values	Solution Impurity H2O Properties	Water Quality	Sp Tab EC Tab	DLockup LockUp	DTrack Track	DSz Sz MSz	DSSA SSA

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This section is used to display the included properties for Heats of Combustion.

Heats of Combustion

Tag (Long/Short)	Input / Calc	Description/Calculated Variables / Options
Heat of Combustion These will only be shown if the user has chosen to display the HeatsOfCombustion Properties on the Plant Model - Views tab page or from the Include Properties dropdown list on the first page of the material Flow section. The Heat of Combustion is the heat released (i.e. enthalpy change) if the stream components undergo complete combustion with oxygen to produce carbon dioxide gas and water. The higher heating value (HHV) (or Gross Calorific Value) is calculated by assuming that the water produced is liquid water. The lower heating value (LHV) (or Net Calorific Value) is calculated by assuming that the water is produced as steam. NOTE: The Heat of Combustion is only calculated for components which contain only carbon (e.g. carbon solid), only hydrogen (e.g. hydrogen gas) or only carbon and hydrogen (i.e. a hydrocarbon, e.g. methane (CH4)). Components which contain only carbon and oxygen (e.g. carbon monoxide) and only carbon, hydrogen and oxygen (e.g. ethanol) are also included. If oxygen gas and/or carbon dioxide gas are not included in the project then the following numbers will be assumed when calculating the heat values (all values are at 298K). Species Heat of Formation (Hf) (kJ/mol) Heat Capacity (Cp) (J/K.mol) Oxygen (O2(g)) 0 29.379 Carbon Dioxide (CO2(g)) -393.8 37.171 Reference:The Properties of Gases and Liquids, 4th Edition (Reid, Prausnitz and Poling)
HoC (Heats of Combustion)
HHV.M150	Calc	Higher Heating Value - Heat released if the stream components undergo complete combustion with oxygen to produce carbon dioxide gas and liquid water at 150°C and 1 atmosphere pressure on a mass basis.
HHV.M25	Calc	Higher Heating Value - Heat released if the stream components undergo complete combustion with oxygen to produce carbon dioxide gas and liquid water at 25°C and 1 atmosphere pressure on a mass basis.
HHV.Ml25	Calc	As above except on a molar basis.
HHV.V25	Calc	As above except on a volumetric basis. NB Gas mass per volume calculated at 25°C and stream pressure.
HHV.M	Calc	Higher Heating Value - Heat released if the stream components undergo complete combustion with oxygen to produce carbon dioxide gas and liquid water at the stream temperature and pressure on a mass basis.
HHV.Ml	Calc	As above except on a molar basis.
HHV.V	Calc	As above except on a volumetric basis. NB Gas mass per volume calculated at the stream temperature and pressure.
LHV.M150	Calc	Lower Heating Value - Heat released if the stream components undergo complete combustion with oxygen to produce carbon dioxide gas and steam at 150°C and 1 atmosphere pressure on a mass basis.
LHV.M25	Calc	Lower Heating Value - Heat released if the stream components undergo complete combustion with oxygen to produce carbon dioxide gas and steam at 25°C and 1 atmosphere pressure on a mass basis.
LHV.Ml25	Calc	As above except on a molar basis.
LHV.V25	Calc	As above except on a volumetric basis. NB Gas mass per volume calculated at 25°C and stream pressure.
LHV.M	Calc	Lower Heating Value - Heat released if the stream components undergo complete combustion with oxygen to produce carbon dioxide gas and steam at the stream temperature and pressure on a mass basis.
LHV.Ml	Calc	As above except on a molar basis.
LHV.V	Calc	As above except on a volumetric basis. NB Gas mass per volume calculated at the stream temperature and pressure.