A single-pass, double-tube counterflow heat exchanger will be used to heat a 0.070 kg/s stream of air flowing in the annulus from 5'C to 35. The air...
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A single-pass, double-tube counterflow heat exchanger will be used to heat a 0.070 kg/s
stream of air flowing in the annulus from 5'C to 35.C. The air will be heated with a
0.040 kg/s stream of hot air flowing through the inside tube, and the hot air enters the
heat exchanger at 180 C. UP =5.3 W/m . K for the heat transfer from the hot air to the
cold air in the heat exchanger. Find the needed length of the heat exchanger (answer:
3.0 m).

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