1. Two long rods of the same diameter-one made of brass (k=85w/m.k) andthe other made of copper (k=375 w/m.k) have one of their ends insertedinto a furnace (as shown in the following figure). Both rods are exposed tothe same environment. At a distance of 105 mm from the furnace, thetemperature of the brass rod is 120°C. At what distance from the furnacewill the same temperature be reached in the copper rod?Furnace105 mm T₁Brass rod⑪hToo-x2-TiCopper rod

The problem is about heat conduction in two different materials, brass and copper. The thermal…

Answered: 1. Two long rods of the same…

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

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2. A steel plate of k=50w/mk and thickness 10cm passes a heat flux by conduction of 25kW/m² . If the temperature of hot surface of plate is 100C, then what is the temperature of the cooler side of plate?
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. Find the heat loss through wooden wall and the glass window ?
• An aluminum pot contains water that is kept steadily boiling (100 °C). The bottom surface of the pot, which is 12 mm thick and 1.5x10t mm2 in area, is maintained at a temperature of 102°C by an electric heating unit. Find the rate at which heat is transferred through the bottom surface. Compare this with a copper based pot. Tc 0 0 L=12mm Base of pot TH A= area of base
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O Which material will transfer more heat? Either a material with thermal conductivity k = 121W/mec or k = 22 Wnsc Justify your answer.
One side of a copper block 5 cm thick is maintained at 250 C. The other side is covered with a layer of fiberglass 2.5 em thick. The outside of the fiberglass is maintained at 35-C, and the total heat flow through the copper- fiberglass combination is 52 kW. What is the area of the slab?
You want to heat a house on a very cold day as shown in the figure. To do this, you want to use photovoltaic panels as an energy source. It would be about using 15 panels each with an area of 1.5 m2. These panels would be connected to an electrical resistance that would heat the house as shown in the figure. The house is losing heat through the walls and ceiling as shown in the figure. The panels are receiving solar radiation at a rate of 800 W / m2 and if their efficiency is 15%. How much will the temperature of the house rise after an hour? The house is hermetically sealed. Assume that the specific heats of air, cv and cp, are constant as shown in the figure. sol = sun fuga = leakage aire = air
B6
3-28E A wall is constructed of two layers of 0.6-in-thick sheetrock (k = 0.10 Btu/h-ft-°F), which is a plasterboard made of two layers of heavy paper separated by a layer of gypsum, placed 7 in apart. The space between the sheetrocks is filled with fiberglass insulation (k = 0.020 Btu/h-ft F). Determine (a) the thermal resistance of the wall and (b) its R-value of insulation in English units. FIGURE P3-28E Fiberglass insulation Sheetrock 0.6 in 7 in I 0.6 in
Ex1. A piece of chromium steel of length 7.4cm (density=8780kg/m³ ; k = 50w/mK and specific heat cp = 440j/kgK) with mass 1.27kg is rolled into a solid cylinder and heated to a temperature of 600°C and quenched in oil at 36°c. Show that the lumped capacitance system analysis is applicable and find the temperature of the cylinder after 4min. What is the total heat transfer during this period? You may take the convective heat transfer coefficient between the oil and cylinder at 280w/m2k.
The inner and outer radii of a hollow cylinder are 15 mm (r, ) and 25 mm (r, ), respectively. The temperatures of the inner and outer walls are 400°C (T,) and 350°C (T,), respectively. The thermal conductivity of the cylinder material obeys the relationship K = (400-0.05T) W/mK where T is in degrees Celsius. Find the heat transferred from the hollow cylinder per unit length. The thermal conductivity,
Solve (c) please.

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