Define the thermal conductivity of a material


Assignment:

Question 1. Enumerate the three modes by which heat can be transferred from one place to another. Which is the slowest of all ?

Question 2. How do you define the thermal conductivity of a material ?

Question 3. What do you understand by the terms ‘convective heat transfer co-efficient' and ‘overall heat transfer co-efficient'.

Question 4. Derive an expression for heat loss in kJ/m 2 -hr through a composite wall of layers

(i) without considering convective heat transfer co-efficients and

(ii) considering the convective heat transfer co-efficients.

Question 5. Classify the heat exchangers according to the flow directions of fluid and give few examples of each in actual field of application.

 

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Mechanical Engineering: Define the thermal conductivity of a material
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