A 0.3-cm-thick, 12-cm-high, and 18-cm-long circuit board houses 80 closely spaced logic chips on one side, eachdissipating 004 W, as shown in the figure. The board is impregnated with copper fillings and has an effective thermalcònductivity of 30 W/m-K. All the heat generated in the chips is conducted.across the circuit board and is dissipated fromthe back side of the board to a medium at 78°C, with a heat transfer coefficient of 40 W/m2-K.RegoryRAhumimnRcanv71.WWw.TazDetermine the temperature T2-The temperature T2 is°C.

Answered: Image /qna-images/answer/c6237470-545a-4ed3-b680-bcc2fe8db2ed.jpg

Answered: A 0.3-cm-thick, 12-cm-high, and…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

Consider a multi-layered walls of a storage building (no windows) that is made of three layers as shown in the figure. The inside layer is a gypsum material that is 1.0 cm thick and has a thermal conductivity of 0.5 W/m.K. We then have a dense brick layer that is 15.0 cm thick and has a thermal conductivity of k = 5 W/m.K The outside wall is made of a wood panel that is 2.0 cm thick and has a thermal conductivity of k = 1.0 W/m.K In a cold day, the outside can be at -10oC and the convective heat transfer coefficient can be hout = 25 W/m2.K due to wind. Inside air of the building is kept at 10oC and the convective heat transfer coefficient over the inside surfaces is rather low with hin = 5 W/m2.K a) Show the thermal resistance diagram with all the temperature nodes. b) What is the rate of heat loss in kW per m2 under these conditions? c) What would be the temperature of the inside surface of the wall? d) What is the temperature at the interface between the brick wall and the plywood?…
Calculate the heat transfer rate from a single-pane glass window with aninside surface temperature of approximately 20° C and an outside surfacetemperature of 5° C . The glass is 1 m tall, 1.8 m wide, and 8 mm thick, asshown . The thermal conductivity of the glass is approximatelyk = 1.4 W⁄m ·K .
Two large stainless steel plates at temperatures of 90°C and 70°C are separated by a stainless steel rod0.3 m long and 2.5 cm in diameter. The thermal conductivity of type 304 stainless steel is k = 16.2W/m K. The rod is welded to each plate. The space between the plates is filled with insulation so thatno heat is lost from the circumference of the rod. Because of a voltage difference between the twoplates, current flows through the rod, resulting in a uniform heat generation rate of 1.5 x 105 W/m3.a) Solve for the temperature distribution in the rod as a function of position x analytically (integratethe equation).b) Determine the maximum temperature in the rod. Where does it occur?c) Solve for the temperature distribution in the rod as a function of position x using the finitedifference method. Assume a ∆x of 0.05 m. How does this compare to the exact solution?
Problem 2- Consider a square bar with a side length of 20 cm as shown in the figure. The lower side of the bar is kept at 70°C, and the left side of the bar is insulated. Thermal çonductivity of the bar is 1.5 W/m°C. The upper and right surfaces of the bar are in contact with the air at 20°C and the heat transfer coefficient on these surfaces are 1oW/m*C. The bar is in steady state condition. Find the 2. temperatures at points 1 and 2 of the bar. 20cm とこがん

Water hardening process of 2 m long and 0.05 m diameter steel bars will be carried out. The steel bar, which is heated up to 900 °C in the oven, is cooled to an average temperature of 100 °C in a water bath. The water bath is kept at a uniform temperature of 30 °C and the heat transfer coefficient between the water and the rod surface is 325 W/m2K. Accordingly, calculate the time required for the steel bar to cool to 100°C in the water bath. (Steel bar p=7832 kg/m3, cp=434 J/kgK, k=63.9 W/mK)
A 12cm outside diameter and 10cm inside diameter cast iron pipe with conductivity of 80W/m-K has 4 cm of polystyrene insulation with conductivity of 0.027W/m-K. Saturated steam at 500degC is flowing through pipe and the outside surface temperature is 60degC. Determine the temperature of the outside surface of the pipe.
Pr
A glass window with an area of 0.625 m² is installed in the wooden outside wall of a room. The wall dimensions are 25 x 3.05 m. The wood has a k of 0.151W/m.K and is 3.05 cm thick. The glass has a k of 0.692W/m.K and is 5.0 mm thick. The temperature of the inside room is 27°C and outside air temperature is 268K. (1)What is the heat loss through wooden wall and glass window q(W) ? (2) What are the total heat loss?
A 0.5-ampere current is flowing through a long electrically conducting cylindrical rod. The diameter of the rod is 6 mm, the electrical resistance of the rod is R = 2000 /m, and k =0.9 W/m K for the rod. The rod is encased in a 2-mm thick Pyrex tube and a 20°C liquid is flowing over the outer surface of the Pyrex tube. The convection heat transfer coefficient for the liquid h= 800 W/m2 . K. The interfacial conductance (contact resistance) at the interface between the rod and the Pyrex tube is h = 1200 W/m² - K. a) Compute the rate of heat generation in the rod and use it compute the volumetric rate of heat generation. b) Find the temperature drop across the interface between the outer surface of the rod and the inner surface of the Pyrex tube. c) Find the temperature at the center of the rod.
Calculate the heat transfer in kj per hour through a solid brick wall 9 cm, 3 m high and 219 mm thick, when the outer surface is at 5C and the inner surface 17C, the coefficient of thermal conductivity of the brick is 0.6 W/m-K.
Q4/A 2-mm-diameter and 10-m-long electric wire is tightly wrapped with a 1-mm-thick plastic cover whose thermal conductivity is k-0.15 W/m "C. Electrical measurements indicate that a current of 10 A passes through the wire and there is a voltage drop of 8 V along the wire. If the insulated wire is exposed to a medium at Ts= 30°C with a heat transfer coefficient of h-24 W/m² C, determine the temperature at the interface of the wire and the plastic cover in steady operation. Also find the critical radius of plastic insulation. [334 T=30°C Electrical wire Insulation bale 10 m

Recommended textbooks for you

Elements Of Electromagnetics

Mechanical Engineering

ISBN:

9780190698614

Author:

Sadiku, Matthew N. O.

Publisher:

Oxford University Press

Mechanics of Materials (10th Edition)

Mechanical Engineering

ISBN:

9780134319650

Author:

Russell C. Hibbeler

Publisher:

PEARSON

Thermodynamics: An Engineering Approach

Mechanical Engineering

ISBN:

9781259822674

Author:

Yunus A. Cengel Dr., Michael A. Boles

Publisher:

McGraw-Hill Education

Elements Of Electromagnetics

Mechanical Engineering

ISBN:

9780190698614

Author:

Sadiku, Matthew N. O.

Publisher:

Oxford University Press

Mechanics of Materials (10th Edition)

Mechanical Engineering

ISBN:

9780134319650

Author:

Russell C. Hibbeler

Publisher:

PEARSON

Thermodynamics: An Engineering Approach

Mechanical Engineering

ISBN:

9781259822674

Author:

Yunus A. Cengel Dr., Michael A. Boles

Publisher:

McGraw-Hill Education

Control Systems Engineering

Mechanical Engineering

ISBN:

9781118170519

Author:

Norman S. Nise

Publisher:

WILEY

Mechanics of Materials (MindTap Course List)

Mechanical Engineering

ISBN:

9781337093347

Author:

Barry J. Goodno, James M. Gere

Publisher:

Cengage Learning

Engineering Mechanics: Statics

Mechanical Engineering

ISBN:

9781118807330

Author:

James L. Meriam, L. G. Kraige, J. N. Bolton

Publisher:

WILEY

SEE MORE TEXTBOOKS