# ProbSet4 - 612 W/m 2 ⋅ K What is the heat transfer...

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1 ME 416 Computer Assisted Design of Thermal Systems Practice Problem Set #4 Heat Exchangers 1. Cold Water at 20°C and 5000 kg/hr is to be heated by water supplied at 80°C and 10,000 kg/hr. You select from a manufacturer's catalog a shell and tube heat exchanger (one shell with two tube passes) having a UA value of 11,600 W/K. Determine the hot water outlet temperature. 2. An automobile radiator may be viewed as a cross-flow heat exchanger with both fluids unmixed. Water, which has a flow rate of 0.05 kg/s, enters the radiator at 400 K and is to leave at 330 K. The water is cooled by air which enters at 0.75 kg/s and 300 K. If the overall heat transfer coefficient is 200 W/m 2 K, what is the required heat transfer surface area? 3. A concentric tube, counter flow heat exchanger is used to condense saturated water vapor flowing at 0.09 kg/s and 400 K to saturated liquid. Water enters the heat exchanger at 300 K and 0.6 kg/s. The overall heat transfer coefficient is

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Unformatted text preview: 612 W/m 2 ⋅ K. What is the heat transfer surface area required? If the inside tube has a diameter of 2.5 cm, determine the length of the heat exchanger. 4. A single-pass, cross-flow heat exchanger uses hot exhaust gases (mixed) to heat water (unmixed) from 30°C to 80°C at a rate of 3 kg/s. The exhaust gases, having thermophysical properties similar to air, enter and exit the heat exchanger at 225°C and 100°C, respectively. If the overall heat transfer coefficient is 250 W/m 2 ⋅ K, estimate the required surface area. ME 416 CAD of Thermal Systems 2 5. Consider the plate-fin compact heat exchanger shown below. 8.5 mm 32 mm 34 mm Fin Pitch: 230 fins/m Fin Thickness: 0.20 mm Tube Wall Thickness: 0.25 mm Determine the ratio of solid volume to total volume for this heat exchanger....
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