A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of__________________?
Correct answer: B. 20.8
- A. 2
- B. 20.8
- C. 20.2
- D. 20.5
Explanation
Adding a second pass approximately doubles the air velocity. Since the air-side film coefficient varies roughly as velocity to the 0.8 power, its ratio is 2^0.8, represented by option b as 2^0.8.
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