Only 10 percent of the energy dissipated by the tungsten filament of an incandescent lamp is in
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Only 10 percent of the energy dissipated by the tungsten filament of an incandescent lamp is in the form of useful visible light. Consider a 100 W lamp with a 10 cm spherical glass bulb. Assuming an emissivity of 0.85 for the glass and ambient air temperature of 20?C, what is the temperature of the glass bulb?GIVENA spherical glass light bulb in airBulb power consumption (P) = 100W10% of energy is in the form of visible lightDiameter (D) = 10 cm = 0.1 mBulb emissivity (ε) = 0.85Ambient temperature (T??) = 20?C = 293 KASSUMPTIONSAmbient air is tillThe bulb has reached steady stateThe surrounding behave as a black body atT??
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The rate of heat transfer by convection and radiation from the bulb must equal the rate of heat gene...View the full answer
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Related Book For 
Principles of heat transfer
ISBN: 978-0495667704
7th Edition
Authors: Frank Kreith, Raj M. Manglik, Mark S. Bohn
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