Transcription of Chapter 8 and 9 – Energy Balances - Poly
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Chapter 8 and 9 – Energy Balances - Poly
CBE2124, Levicky 1 Chapter 8 and 9 Energy Balances Reference States. Recall that enthalpy and internal Energy are always defined relative to a reference state ( Chapter 7). When solving Energy balance problems, it is therefore necessary to define a reference state for each chemical species in the Energy balance (the reference state may be predefined if a tabulated set of data is used such as the steam tables). Example. Suppose water vapor at 300 oC and 5 bar is chosen as a reference state at which H is defined to be zero.
In equation 9, the index i ranges over all of the components of the mixture. xi is the mass fraction (if using heat capacities expressed per mass of material) or mole fraction (if using heat capacities expressed per mole of material) of component i in the mixture, and Cp,i is the heat capacity of species i in its pure form. The enthalpy
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