Discussion
Batch heating of a stirred tank by a coil gives a temperature that
Answer: C
Correct answer: approaches the coil temperature
The driving force for heat transfer is the difference between the coil and the contents, so as the contents warm the difference shrinks and the heating slows. The approach is exponential, and the contents can never exceed the coil temperature - which is why a steam coil at a given pressure sets a ceiling on what the batch can reach, however long it is heated.
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