[Plane wall conduction with heat generation] When passing an electrical current I (A), a copperbus bar of rectangular cross section (6 mm × 150 mm) experiences uniform energy generation at arate ġ (W /m³) given by ġ = al? where a = 0.015 W /m³ · A² . If the bar is in ambient air withh = 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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Answered: [Plane wall conduction with heat…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Conduction Heat Transfer X material (a) material (b) . both (a) and (b) have the same thermal conductivity the temperature distribution is independent of thermal conductivity it's not that simple 9. Fin efficiency is defined as: • tanh (mL) (hP/k Ac)1/2 (heat transfer with fin) / (heat transfer without fin) (actual heat transfer through fin) / (heat transfer assuming all fin is at T = Tb) (Tx=L-Tf)/(Tb-Tf) 10. For an infinite fin, the temperature distribution is given by: (T-Tf)/(Tb-Tf)= e-mx. The heat flow through the fin is therefore given by: k (Tb-Tf)/L ● zero, because the fin is infinite ● infinite because the fin is infinite ● (Tb-Tf) (hP/k Ac)1/2 ● (Tb – Tf) (h P / k Ac)1/2 tanh (mL) 11. The Biot number, Bi, is defined as: • Bi=hk/L • Bi=hL/k • Bi= k/LH • Bi=qL/k • Bi=p UL/k 12. For a plate of length L, thickness, t, and width, W, subjected to convection on the two faces of area L x W. What is the correct length scale for use in the Biot number? . L ● W ● t • t/2 • L/2 13. If Bi…
1 example each Conductive heat flow through flat surface Conductive heat flow throw composite wall
1. Discuss all the processes involved in engineering design 2. The resistance of a copper wire used to make a motor is 0.5 Ω at 25 oC and 0.8 Ω at the motor’s operating temperature. Determine the operating temperature and the rise in temperature of the motor, given that copper has a temperature constant of 234.5 oC. 3. What are the possible energy sources and energy transfer systems of a purely mechanical machine?
%^0 |. دردشة هندسة النفط/مسائي A composite wall consisting of five series layers of materials with different properties. Layer thickness, thermal conductivity of the layers and temperatures are shown on the figure. Based on Fourier's law for conduction, answer the following questions. 1. What are the main assumptions? 2. Drive an equation to calculate the heat transfer rate through the Composite wall? 3. Draw the themal circuit through composite wall? 4. What are the value Ti? 5. What are the value Tj? 6. What are the value Tr? Givens: KA = 2 W/m. °C K= 1 W/m.°C K= 5 W/m. °C Kp= 4 W/m, °C 100°C Ti 25°C Tj Tr A B D -2cm e 6 cm 4 cm 4cm إضافة وصف...
Σ 00 6. B %24 https/0253A%252F%252Fnewconnect.mheducation.com%252F#/activity/question- CH-3) 6 Help Save & Exit i Required information A 14-cm × 20-cm circuit board houses on its surface 100 closely spaced logic chips, each dissipating 0.06 W in the environment at 40°C. The heat transfer from the back surface of the board is negligible. If the heat transfer coefficient on t1 of 3 the surface of the board is 10 W/m².K. Calculate the heat flux on the surface of the circuit board in terms of W/m (Round the final answer to two decimaj places.) Numeric Response Mc Graw < Prev 4. 11:35 18°C Partly sunny 9N3 ツゆ v 23/10/2021 tio SU 61 & 23 3 4. 5. н alt gr curi
An external wall of a building has a U value of 0.50 W/m^2K. The indoor temperature is21 degrees C and the outdoor temperature is -2.0 degrees C The steady-state heat loss is calculated to be 11.5W/m^2 The wall contains a layer of insulation 40 mm thick with a conductivity of0.035 W/mK. What would the insulation thickness need to be in order toreduce the steady state heat loss by 50%? answer = 0.11m please show all working
An insulated steel pipe carrying an oil having outside temperature of 90℉ and inside temperature of 150℉ with length of 2438.4 cm. Inside pipe diameter is 38.1 cm, thickness of 50.6 mm thermal conductivity of pipe is 45W/(m℃), h_i=567.85 W/(m^2℃). The outside diameter of corrugated asbestos insulation is 558.8 mm with thermal conductivity of 0.2W/(m℃), h_o=68.1422W/(m^2℃) . Find the heat loss of pipe in KJ/min.
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:D docs.google.com/forms :QT: Choose the correct answer نقطة واحدة The minus sign in Fourier's law is necessary because heat is always transferred in the direction of increasing temperature O decreasing temperature össlg äbäs The thermal resistance of the : wall is given by kL/A O None k/AL O L/kA O نقطة واحدة With composite walls it is often convenient to work with an overall heat transfer coefficient U, which is

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