Reference no: EM132617827
MME502 Heat Transfer - Engineering Institute of Technology
Question 1:
Water at 25oC with a mass flow rate of 6 kg/s is available to cool hot oil from 80oC to 20oC. The oil mass flow rate is 2 kg/s. A shell-and-tube heat exchanger with one-shell pass and four tube-passes is proposed for this process.
Using uniform cp values of 2.5 kJ/(kgoC) and 4.2 kJ/(kgoC) for oil and water, respectively, and assuming an overall heat transfer coefficient of 260 W/(m2oC) for the heat exchanger:
a) determine the surface area of the heat exchanger
b) plot the heat exchanger surface area as a function of water mass flow rate, when the mass flow rates vary between 5 and 30 kg/s.
Question 2:
A triangular straight fin of 0.1 m in length, 0.02 m thick at the base, and 0.2 m in depth is used to extend the surface of a wall at 200oC. The wall and the fin are made of mild steel (k = 54 W/moC). Air at 10oC (h = 200 W/m2oC) flows over the surface of the fin.
Evaluate the temperature at 0.05 m from the base and at the tip of the fin. Determine the rate of heat removal from the fin and the fin efficiency. [Use MS-Excel to solve the Question and plot temperature profile].
Question 3:
The temperature distribution across a large concrete slab 50 cm thick, heated from one side, as measured by thermocouples approximates to the relation: T(x) = 60 - 50x + 12x2 + 20x3 - 15x4, where T is in deg.C and x is in metres. Considering an area of 5 m2, compute:
a) heat entering and leaving the slab in unit time
b) heat stored in unit time For concrete take k = 1.2 W/mK
First solve this Question analytically, then use MS Excel to solve and plot temperature distribution. Compare both analytical and computational methods and report any differences in results.
Question 4:
A process fluid having a specific heat of 3500 J/kgK and flowing at 2 kg/s is to be cooled from 80°C to 50°C with chilled water, which is supplied at a temperature of 15°C and a flow rate of 2.5 kg/s. Assuming an overall heat transfer coefficient of 2000 W/m2 K, calculate the required heat transfer areas for the parallel flow heat exchanger configuration.
Attachment:- Heat Transfer.rar
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