3. An electric immersion heater, 10 mm in diameter and 300 mm long, is rated at 550 W. The emissivity of the heater is ε = 0.85. a) If the heater is horizontally positioned in a large tank of water at 20°C, estimate its surface temperature. b) If the heater is accidentally operated in air at 20°C, estimate the surface temperature. Hint: Radiation heat transfer can be neglected in liquids, but not in gases like air.

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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3. An electric immersion heater, 10 mm in diameter and 300 mm long, is rated at 550 W. The
emissivity of the heater is ε = 0.85.
a) If the heater is horizontally positioned in a large tank of water at 20°C, estimate its surface
temperature.
b) If the heater is accidentally operated in air at 20°C, estimate the surface temperature.
Hint: Radiation heat transfer can be neglected in liquids, but not in gases like air.
Transcribed Image Text:3. An electric immersion heater, 10 mm in diameter and 300 mm long, is rated at 550 W. The emissivity of the heater is ε = 0.85. a) If the heater is horizontally positioned in a large tank of water at 20°C, estimate its surface temperature. b) If the heater is accidentally operated in air at 20°C, estimate the surface temperature. Hint: Radiation heat transfer can be neglected in liquids, but not in gases like air.
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