2) For a wall that has a thermal conductivity of 4.80 BTU/ft. hr. F°, the surface area isequal to 3 m^2. The temperature difference is equal to 26F°.The thickness of the wall is400 mm. Determine the following:a. The total heat loss in 7 hours in BTUb. Assume that all the conditions were retained except that the area was reduced to 2 m^2,what is the percentage reduction in the rate of heat transfer through the wall.c. Explain the concepts/principles that were considered and the factors that affected thecondition of the above mentioned items (a & b).

Answered: Image /qna-images/answer/fdeabb2b-cb75-40f0-88ca-f5991cd21132.jpg

Answered: For a wall that has a thermal…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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Solve with thermal resistance and conduction/convection. Specifically account for the V= 9 ft/s The wall of a furnace has an inner temperature of 500 F. The wall has a thickness of 2 inches and has a thermal conductivity of 0.02 Btu/(h·ft·F). On the outside, air at 30 F flows over the 10 ft x 10 ft wall at a speed of 9 ft/s. Determine the rate of heat loss from the furnace to the environment.
2.) A 30 ft copper pipe is 1.5 ft in diameter and has a thickness of 2 in. It has an internal temperature of 85F and an external temperature of 70F. Solve for k if the rate of heat transfer is 2.6 x 106 Btu hr
: A spherical container ( k= 30 W/moC ) with inner radius r1 = 2 m and outer radius ro=2.1 m is is filled with ice water T= 0 oC subjected to the convection on the outer surface T∞2 = 25 oC , h∞2= 18 W/m2 oC .For steady one-dimensional heat transfercalculate a) The mathematical formulation b) the variation of temperature, and c) therate of heat transfer are to be determined fo
A plane wall has internal heat generation and is cooled covectively at its two faces. Given : A) heat generation ate g1,000W /m? 2L 100 mm wall thickness T- 20C air temp temp within wall T(x)=10(0.05'-x')+30 W Im.K Al) Find thermal conductivity of the wall k WIm'.K A2) Find convection heat transfer coeff
C: water flows at 50 °C inside a 2.5 cm diameter tube such that h-3500 W/m2. °C. The tube has a wall thickness of 0.8 mm with a thermal conductivity of 16 W/m.°C. The outside of the tube loses heat by convection with ho-7.6 W/m².°C. If the heat loss to the surrounding per unit length is 19 W. Calculate the surrounding air temperature.
1-) Die casting is a metal casting process that is characterized by forcing molten metal under high pressure into a mould cavity. A circular die (k = 150 W/mK, T = 125 °C) is used to drill a hole (D = 0.5 m) along length L = 3 m through a cylindrical metal (D = 2 m) as shown in the figure. A cooling fluid (k = 0.6 W/mK) passes through the hole during the process to keep the inner surface temperature of the hole to 85 °C. In the meantime, the outer surface temperature of the cylinder is held at 30 °C. The hole is drilled eccentrically (not in the origin of the cylinder, 0.1 m perpendicular distance) as shown in the figure. If the heat loss through the cylinder is XY kW during this process, what is the thermal conductivity of the cylindrical metal? (Take the heat loss value XY as a 49 2m 0.1m %3D 3m
Q1) Find the heat transfer rate through a plane wall 20cm thick and 0.1m2 heat transfer area. The temperatures across the wall are 100 "C and 10 C respectively and the thermal conductivity is varies according to the equation (k = 60(1+0.03T)).
1. The thermal resistance of A, B, C, and D are 1, 2, 2, 4 W/ °C, respectively. The total thermal resistance to the wall conductance will be TAs = 200°C a. 9.0 W/ °C b. 5.5 W/ °C C. 6.0 W/ °C d. 16 W/ °C a. 0.672 b. 0.232 C. 0.0672 d. 0.023289 a. 250 W/mK b. 1.25 W/mK 6 cm C. 0.25 W/mK d. 0.125 W/mK A B с 2 cm 2.5 cm 3 cm g. 47.14% h. 14.14% 3 cm 2. The heat transfer due to radiation from a surface of 2 cm² area at 800 °C to a very cold enclosure is 5.0 W. Determine the emissivity of the surface at this temperature D 4 cm Problem 1.34 6 cm 3. An electric wire carrying current is covered with an insulating material. The critical diameter of the insulation is 10 mm. The outside air has heat transfer coefficient of 25 W/m² K TDs = 50°C 4. A hot potato is put in water bowl. Another hot potato of same temperature and size is kept in open air at same temperature that of water. Which potato will cool quicker and why? a. Potato in water bowl, as there will high convection comparatively b.…

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