Air is best heated with steam in a heat exchanger of__________________?
Correct answer: C. Double pipe type with fin on air side
- A. Plate type
- B. Double pipe type with fin on steam side
- C. Double pipe type with fin on air side
- D. Shell and tube type
Explanation
Air has a much lower convective heat-transfer coefficient than condensing steam, so the air-side resistance controls the exchanger design. Fins are therefore placed on the air side to increase its effective heat-transfer area.
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