Your answer is partially correct. Consider a power transistor encapsulated in an aluminum case that is attached at its base to a square aluminum plate of thermal conductivity k = 240 W/m-K, thickness L = 8 mm, and width W = 24 mm. The case is joined to the plate by screws that maintain a contact pressure of 1 bar, and the back surface of the plate transfers heat by natural convection and radiation to ambient air and large surroundings at T = Tsur = 30°C. The surface has an emissivity of ε = 0.9, and the convection coefficient is h = 48 W/m²-K. The case is completely enclosed such that heat transfer may be assumed to occur exclusively through the base plate. Ts.p = 9max 357.9 Transistor case Tsc. Pelec i 0.5992 Enclosure K 1 If the air-filled aluminum-to-aluminum interface is characterized by an area of A = 2 × 104 m² and a roughness of 10 µm and the surface temperature of the case, Tsc, is not to exceed 85°C, determine the maximum allowable power dissipation, in W, and the associated surface temperature of the power transistor, Ts.p. in K. W L ||| Tsur - Base plate, (k, e) -Interface, Ac -Ts.p Air Th
Your answer is partially correct. Consider a power transistor encapsulated in an aluminum case that is attached at its base to a square aluminum plate of thermal conductivity k = 240 W/m-K, thickness L = 8 mm, and width W = 24 mm. The case is joined to the plate by screws that maintain a contact pressure of 1 bar, and the back surface of the plate transfers heat by natural convection and radiation to ambient air and large surroundings at T = Tsur = 30°C. The surface has an emissivity of ε = 0.9, and the convection coefficient is h = 48 W/m²-K. The case is completely enclosed such that heat transfer may be assumed to occur exclusively through the base plate. Ts.p = 9max 357.9 Transistor case Tsc. Pelec i 0.5992 Enclosure K 1 If the air-filled aluminum-to-aluminum interface is characterized by an area of A = 2 × 104 m² and a roughness of 10 µm and the surface temperature of the case, Tsc, is not to exceed 85°C, determine the maximum allowable power dissipation, in W, and the associated surface temperature of the power transistor, Ts.p. in K. W L ||| Tsur - Base plate, (k, e) -Interface, Ac -Ts.p Air Th
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter8: Natural Convection
Section: Chapter Questions
Problem 8.50P
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