0.35 kg/s of styrene is to be cooled from 90°C to 55°C in the annulus of a doubl
ID: 2327384 • Letter: 0
Question
0.35 kg/s of styrene is to be cooled from 90°C to 55°C in the annulus of a double pipe heat
exchanger. The two steel pipes are 1¼ in and 2 in nominal size. A cooling stream of water, in the
inner tube, is available at a temperature of 27°C. The inside heat transfer coefficient is given and
it is 1.0 kW/m2.°C. Calculate the mass flowrate of water required if the outlet temperature of
water is 45°C, LMTD, the overall heat transfer coefficient based on outside surface, and total
surface area of the exchanger. If the effective exchanger length is not to exceed 8 ft, calculate the
number of tubes required. Use both the Dittus-Boelter equation and Second Petukhov equation
for your calculations. Also, do the calculations for both cocurrent flow and countercurrent flow.
Use reliable literature source for the physical properties.
Explanation / Answer
The answer of following question is as follows .
The required of number of tubes are 7 .
The mass flow rate 89mm3/sec .
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