[Plane wall conduction with heat generation] When passing an electrical current I (A), a copper bus bar of rectangular cross section (6 mm × 150 mm) experiences uniform energy generation at a rate à (W /m³) given by ġ = al² where a = 0.015 W /m³ · A² . If the bar is in ambient air with h = 5 W/m² · K and its maximum temperature must not exceed that of the air by more than 30°C, what is the allowable current capacity for the bus bar?

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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[Plane wall conduction with heat generation] When passing an electrical current I (A), a copper
bus bar of rectangular cross section (6 mm × 150 mm) experiences uniform energy generation at a
rate ġ (W /m³) given by ġ = al? where a = 0.015 W /m³ · A² . If the bar is in ambient air with
h = 5 W/m2 · K and its maximum temperature must not exceed that of the air by more than 30°C,
what is the allowable current capacity for the bus bar?
Transcribed Image Text:[Plane wall conduction with heat generation] When passing an electrical current I (A), a copper bus bar of rectangular cross section (6 mm × 150 mm) experiences uniform energy generation at a rate ġ (W /m³) given by ġ = al? where a = 0.015 W /m³ · A² . If the bar is in ambient air with h = 5 W/m2 · K and its maximum temperature must not exceed that of the air by more than 30°C, what is the allowable current capacity for the bus bar?
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