Double pipe heat exchangers are used__________________?
Correct answer: B. When heat transfer area required is very low, i.e. (100-200 ft2).
- A. When heat transfer area required is very high
- B. When heat transfer area required is very low, i.e. (100-200 ft2).
- C. Because it occupies less floor area
- D. Because it is less costly
Explanation
Double-pipe exchangers are simple and economical for relatively small heat-transfer areas, commonly around 100–200 ft². For very large areas, shell-and-tube or other exchangers are preferred because double-pipe units require excessive length and floor space.
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