Exam2024Proposed solution included

MET 308 Heat and Mass Transfer Exam 2024

MET 308: Second Semester Exam, University of Buea, College of Technology, Department of Mechanical Engineering, Lecturers Mrs. Chancelle Ntiaya and Dr. Arsene Noume, 06 July 2024: Problem 1, convective heat loss from a standing man modeled as an insulated-top/bottom vertical cylinder; Problem 2, determining thermal conductivity from a guarded cylindrical-sample conduction experiment; Problem 3, transient heating time and convection coefficients for an immersed electric resistance heater raising a tank of water to temperature; Problem 4, minimum fiberglass insulation thickness needed in a refrigerator wall to avoid outer-surface condensation.

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University of Buea

College of Technology - COT

Mechanical Engineering - MET

MET3082024

Heat and Mass Transfer

Exam · Second Semester · Level 300

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For heat transfer purposes, a standing man can be modeled as a 30-cm-diameter, 170-cm-long vertical cylinder with both the top and bottom surfaces insulated and with the side surface at an average temperature of 34°C. For a convection heat transfer coefficient of 15 W /m 2.°C, determine the rate of heat loss from this man by convection in an environment at 20°C.
In a certain experiment, cylindrical samples of diameter 4 cm and length 7 cm are used. The two thermocouples in each sample are placed 3 cm apart. After initial transients, the electric heater is observed to draw 0.6 A at 110 V, and both differential thermometers read a temperature difference of 10°C. Determine the thermal conductivity of the sample.

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