HEAT+MASS TRANSFER (LL)-W/ACCESS
6th Edition
ISBN: 9781265879631
Author: CENGEL
Publisher: MCG CUSTOM
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Textbook Question
Chapter 1, Problem 155P
Over 90 percent of the energy dissipated by an incandescent lightbulb is in the form of heat, not light. What is the temperature of a vacuum-enclosed tungsten filament with an exposed surface area of 2.03 cm2 in a 100-W incandescent lightbulb? The emissivity of tungsten at eh anticipated high temperatures is about 0.35. Note that the lightbulb consumes 100 W of electrical energy and dissipates all of it by radiation.
- 1870 K
- 2230 K
- 2640 K
- 3120 K
- 2980 K
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28. The shaft shown in Figure P5-28 is supported by bear-
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Chapter 1 Solutions
HEAT+MASS TRANSFER (LL)-W/ACCESS
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