Master of Engineering
(Mechanical)

Master of Engineering (Mechanical) 2
MME502_Assessment3_PaperB_v1.1
Assessment Instructions:
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understand your requirements and responsibilities as a student of EIT.
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UNIT#_ASSESSMENT#_YOURNAME_DATE
E.g. ME501_Assessment2_SteveMackay_01Aug2019
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Master of Engineering (Mechanical) 3

Please complete your answers on the assessment cover page document available on Moodle.
Clearly label your question numbers (there is no need to copy the full question over). Include all working
out.
Question 1: (20 marks)
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.
[Use MS-Excel to solve the problem and plot.]
Question 2: (25 marks)
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 problem and plot temperature profile].
Master of Engineering (Mechanical) 4
MME502_Assessment3_PaperB_v1.1
Question 3: (25 marks)
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 problem 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: (20 marks)
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.
(Hint: Use IHT software & Bergman Book)
Take screenshots of your results in IHT software and paste it.

Master of Engineering (Mechanical) 5
• Record your 5-minutes presentation using Loom Video Recorder (Or similar another
recorder like Screencastify is fine as well)
• Introduce yourself and explain the Title/Question and Objectives briefly (1 minute)
• Start explaining your Answer/Solutions (4 minutes)
• Paste the link of your recording within your assessment report.
Presentation Grading Rubric

END OF ASSESSMENT