In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will___________________?
Correct answer: D. Remain unchanged
- A. Increase
- B. Decrease
- C. Either increase or decrease; depends on the coolant flow rate
- D. Remain unchanged
Explanation
With condensing steam, the hot-side temperature is essentially constant, so reversing the coolant inlet and outlet temperatures only reverses the two terminal temperature differences. Their logarithmic mean remains unchanged, so the condensation rate is unchanged.
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