Q: Oil / is used to heat water in a shell-and
Oil / is used to heat water in a shell-and-tube heat exchanger with a single shell pass and two tube passes. The overall heat transfer coefficient is 525 W/m2 K. The mass flow rates are 7 kg/s for the...
See AnswerQ: A flat roof of a house absorbs a solar radiation flux of
A flat roof of a house absorbs a solar radiation flux of 600 W/m2. The backside of the roof is well insulated, while the outside loses heat by radiation and convection to ambient air at 20°C. If the e...
See AnswerQ: A shell-and-tube heat exchanger with two tube passes
A shell-and-tube heat exchanger with two tube passes and a single shell pass is used to heat water by condensing steam in the shell. The flow rate of the water is 15 kg/s, and it is heated from 60°C t...
See AnswerQ: Benzene flowing at 12.5 kg/s is to be
Benzene flowing at 12.5 kg/s is to be cooled continuously from 82°C to 54°C by 10 kg/s of water avail- able at 15.5°C. Using Table 10.6, estimate the surface area required for (a) cross-flow with six...
See AnswerQ: Water entering a shell-and-tube heat exchanger at 35
Water entering a shell-and-tube heat exchanger at 35°C is to be heated to 75°C by an oil. The oil enters at 110°C and leaves at 75°C. The heat exchanger is arranged for counterflow with the water maki...
See AnswerQ: Starting with a heat balance, show that the heat exchanger effectiveness
Starting with a heat balance, show that the heat exchanger effectiveness for a counterflow arrangement is
See AnswerQ: The soldering iron tip in Problem 1.53 becomes oxidized with
The soldering iron tip in Problem 1.53 becomes oxidized with age and its gray-body emittance increases to 0.8. Assuming that the surroundings are at 20°C, determine the power requirement for the solde...
See AnswerQ: In the shell of a shell-and-tube heat exchanger
In the shell of a shell-and-tube heat exchanger with two shell passes and eight tube passes, 12.6 kg/s of water is heated from 80°C to 150°C. Hot exhaust gases having roughly the same physical propert...
See AnswerQ: In gas turbine recuperators the exhaust gases are used to heat the
In gas turbine recuperators the exhaust gases are used to heat the incoming air and Cmin/Cmax is therefore approximately equal to unity. Show that for this case / for counter- flow and / for parallel...
See AnswerQ: Repeat Problem 10.1 but assume that a fouling factor of
Repeat Problem 10.1 but assume that a fouling factor of 0.00018 m2 K/W has developed on the inside of the tube during operation.
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