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Heat Transfer: Heat Loss and Temperatures

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The base of a 2 cm X 3 cm X 20 cm long rectangular rod is kept at 175 degrees Celsius by electrically generated heat. This is known as a straight fin or longitudinal fin. The ambient air surrounding this fin is at 28 degrees Celsius and h=10 W/m^2-C. There is negligible heat loss at the tip of the rod.

1. What is the temperature 7 cm from the base if the rod is made of a) pure zinc b) lead c) pure gold. Which will be the hottest at this point?

2. What energy input is needed to keep the base temperature at the 175 degrees for each metal?

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Solution Preview

The base of a 2 cm X 3 cm X 20 cm long rectangular rod is kept at 175 degrees Celsius by electrically generated heat. This is known as a straight fin or longitudinal fin. The ambient air surrounding this fin is at 28 degrees Celsius and there is negligible heat loss at the tip of the rod.

1. What is the temperature 7 cm from the base if the rod is made of a) pure zinc b) lead c) pure gold. Which will be the hottest at ...

Solution Summary

This 4-page solution gives a step by step solution on how to solve a typical fin heat transfer problem. Each section of the problem is addressed. These steps can be applied to similar problems. The solution is provided both in .doc and .pdf.

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