MME502 - Heat Dissipation for an Electronic Component Assignment

Assignment Task

Question 1 : An electronic component is mounted on a base 60 x 60 mm. The base temperature is 80oC. It is to be cooled with ambient air at 30oC. The heat transfer coefficient can be taken as 15 W/m2 K. Neglect radiative heat transfer.

a) Calculate the maximum heat dissipation possible if no fins are used. 

b) Calculate the heat dissipation possible if a single aluminum (k = 240 w/m K) fin 30 mm high is used over the entire area. Note that it is equivalent to keeping a 60 x 60 x 30 mm aluminum block on the hot base. First make correction for length of the fin as it will not be insulated tip. 

c) Find what error will be introduced if it is assumed that fin tip is insulated.

d) Now replace the aluminum block with n number of 3 x 3 mm square fins equally spaced. Make an analysis with n = 121, 36 and find the heat dissipation possible for each case and for uninsulated and insulated fin tip conditions.

e) What is the % under prediction if insulated fin tip condition is used in each case.

f) Calculate the volume fraction of fins to total geometric volume in d). 

g) If the same volume fraction is used as in the case of 121 fins, but the fin dimensions are changed to 5 x 5 mm, first calculate the number of fins (rounded up) and then calculate the total heat transfer. 

Based on the above information answer the following questions

Question 2: As the volume fraction of fins increases from 0 to 1, does the heat dissipation increase monotonically?

Question 3: For the same volume fraction of fins, should one use large number of small cross-sectional area fins or small number of larger cross-sectional area ones?

Question 4: Deliver a 5-minute presentation The requirements are as follows:

• Select any one of the above questions in this assessment and prepare PowerPoint slides (maximum 6 slides: 1st slide with the question/description, your name and objectives, and the rest of the slides will have your answers: simulation screenshots and bullet points)

• Record your 5-minute presentation with this link: Assessment 3 Presentation Recordings

• Introduce yourself and explain the question and objectives briefly (1 minute)

• Start explaining your simulations/solutions (4 minutes)

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