Q₁: Consider a power transistor that dissipates 0.2 W of power in an environment at 30C. The transistor is 0.4 cm long and has a diameter of 0.5 cm. Assuming heat to betransferred uniformly from all surfaces, determine (a) the amount of heat this resistor dissipates during a 24-h period, in kWh; (b) the heat flux on the surface of the transistor, in W/m2; and (c) the surface temperature of the resistor for a combined convection and radiation heat transfer coefficient of 18 W/m2. C. Ans: a) 0.0048 kWh b) 1959 W/m² c) 193 °C
Q₁: Consider a power transistor that dissipates 0.2 W of power in an environment at 30C. The transistor is 0.4 cm long and has a diameter of 0.5 cm. Assuming heat to betransferred uniformly from all surfaces, determine (a) the amount of heat this resistor dissipates during a 24-h period, in kWh; (b) the heat flux on the surface of the transistor, in W/m2; and (c) the surface temperature of the resistor for a combined convection and radiation heat transfer coefficient of 18 W/m2. C. Ans: a) 0.0048 kWh b) 1959 W/m² c) 193 °C
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:Q₁: Consider a power transistor that dissipates 0.2 W of power in an environment
at 30C. The transistor is 0.4 cm long and has a diameter of 0.5 cm. Assuming heat
to betransferred uniformly from all surfaces, determine (a) the amount of heat this
resistor dissipates during a 24-h period, in kWh; (b) the heat flux on the surface of
the transistor, in W/m2; and (c) the surface temperature of the resistor for a
combined convection and radiation heat transfer coefficient of 18 W/m2 C.
Ans: a) 0.0048 kWh b) 1959 W/m² c) 193 °C
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