Navigation: User Guide -> Specific Heat
The specific heat for each species is defined in the Species Database.
- Heat capacity cannot be zero.
- Heat capacity MUST increase with temperature with the exception of AQUEOUS compounds.
- If Heat capacity value is not specified in the Species Database, then SysCAD will assume a constant value for the species. For more information, please see Species Table.
Water and steam have built-in equations for specific heat, please see Water and Steam Properties for more information.
The specific heat value is used for energy balances:
- Calculate the Stream specific heat
- For a given stream temperature, the stream specific heat values are calculated using the mass weighted mean method: see Stream specific heat values (Cp) for more information.
- Calculate the Heat of Reaction (HOR)
- The specific heat is used to calculate the heat of reaction at temperature.
- If the specific heat value is missing for any species involved in the reaction, then the energy balance may not be correct. If this happens, the user needs to define a Heat of Reaction (HOR) value for the reaction. See Heat of Reaction for more information.
Implementation in SysCAD
- Entering Specific Heat Data in the Species Properties Database - The various Cp equations are described here.
- Water and Steam Properties - Specific heat implementation for steam and water.
- Heat of Reaction - Specific Heats are used to calculate the heat of reaction.
- Specific Heat Information in a Project - The specific heat information can be seen in the Species Properties Access Window (Species - View Properties).
- Stream specific heat values (Cp) - This shows an example on how to calculate the specific heat of the stream at a given temperature.
- Enthalpy Change (Hs) and (Hz) - This shows an example on how to calculate the stream enthalpy change using Cp values.