Discussion
Consider the following statements about writing an unsteady energy balance.
1. The accumulation term involves the mass and heat capacity of the contents.
2. The vessel walls may need to be included if they are massive.
3. The energy balance never needs an initial condition.
Answer: A
The first two are correct, and the wall term matters in a glass lined reactor. The third is wrong, since the starting temperature must be stated exactly as a starting composition must. Wall mass appears alongside the contents in the term.
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