Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is________________?
Correct answer: C. Finned tube heat exchanger with air outside and steam inside
- A. Finned tube heat exchanger with air inside and steam outside
- B. Shell and tube heat exchanger with air inside tubes and steam on shell side
- C. Finned tube heat exchanger with air outside and steam inside
- D. Shell and tube heat exchanger with air on shell side and steam inside tubes
Explanation
Air has a much lower heat-transfer coefficient than condensing steam, so fins should be placed on the air side to increase its effective area. Thus air should flow outside the finned tubes and steam should condense inside them.
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