A wall, as shown in figure, consists of four layers, with thermal conductivities, kį = 0.060 W/m.K, k3 = 0.040 W/m.K, and k4 = 0.12 W/m.K (k2 is not known). The layer thicknesses are L1 = 1.5 cm, L3 = 2.8 cm, and L4 = 3.5 cm (L2 is not known). The known temperatures are T1 = 50°C, T12 = 35°C and T4 = -10°C. Energy transfer through the wall is steady. Apply the concept of steady- state heat transfer through conduction on the wall, and determine the interface temperature T34? k ks - T4 T12 -L- L3 - L4

A wall, as shown in figure, consists of four layers, with thermal conductivities, kį = 0.060 W/m.K, k3 = 0.040 W/m.K, and k4 = 0.12 W/m.K (k2 is not known). The layer thicknesses are L1 = 1.5 cm, L3 = 2.8 cm, and L4 = 3.5 cm (L2 is not known). The known temperatures are T1 = 50°C, T12 = 35°C and T4 = -10°C. Energy transfer through the wall is steady. Apply the concept of steady- state heat transfer through conduction on the wall, and determine the interface temperature T34? k ks - T4 T12 -L- L3 - L4

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

Q2/ A plane wall (K =17 W/m.°C ) with (60 mm) thick. Both sides of the wall are insulated with ( 2 cm) layer of insulating material having (K=0.22 W/m.°C ) The heat transfer coefficient, considering convection on both sides of wall are ( 120 and 10 W/m.°C ) respectively. Calculate the heat transfer per unit area if the temperature difference across the wall is (90 °C).
I need the answer as soon as possible
Find the minimum amount of diameter for the insulation of a cylindrical electrical cable? Radius of the cable is 3 mm, length is 2 m, thermal conductivity is 20 W/(m^2*K) and convective coefficient is 5 WI(m*K) 12 mm 4 mm not sufficient information 3 mm 8 mm
You are designing a 3m x 3m floor with radiant heating. The floor has 12 parallel pex pipes (k = 40 W/mK) of L = 3m, OD = 25mm and ID = 20mm. Hot water (TInfintiy 1 = 90oC, h = 200 W/m2K) runs through the pipes continuously. The surface below the pipes is perfectly insulated. Above the pipes, there is a 3mm layer of bonding material (? = 12 W/mK) and a 9mm layer of tile (k = 2 W/mK). Above the tile, there is air (TInfinity 2 = 25oC, h = 20 W/m2K). Properties of Air: k = 0.025 W/mK, Pr = 0.72, v = 1.847 x 10−5, u = 16.84 x 10−6, p = 1.2 kg/m3, B = 1/Tf (ideal gas), Hint: Assume that the “layer” of pipe starts at the center point (e.g. for conduction purposes, the pipe is OD divided by 2 thick). For convection, consider the entire pipe surface. a) What is the total heat rate entering the room above the floor? b) What is the temperature of the top of the tile?
A multi-layered wall with the dimensions shown in the figure has temperatures of 200°C and 50°C over the left and right surfaces, respectively. If the thermal conductivities of the wall materials A and C are k-60 W/m-K, k-24 W/m-K. If total rate of heat transfer through the wall is 175 W, what is the thermal conductivity of material B? T- 200°C T-soc 6 cm- 2 om 25 om
A thin bar of length L = 3 meters is situated along the x axis so that one end is at x = 0 and the other end is at x = 3. The thermal diffusivity of the bar is k = 0.4. The bar's initial temperature f(x) = 300 degrees Celsius. The ends of the bar (x = 0 and x = 3) are then put in an icy bath and kept at a constant O degrees C. Let u(x, t) be the temperature in the bar at x at timet, with t measured in seconds. Find u(x, t) and then u7 (2, 0.1). Put uz (2, 0.1) calculated accurately to the nearest thousandth (3 decimal places) in the answer box.
I need the answer quickly
The fin shown in Figure is insulated on the perimeter. The left end has a constant temperature of 100 °C. A positive heat flux of q = 5000 W/m² acts on the right end. Let Ky = 10 W/(m °C) and cross-sectional area A = 0.1 m2 Determine the temperatures at L/4, L/2, 3L/4, and L, where L = 0.8 m. 4-0.1 m T-100 C 5000 W/m
In the figure below, it is known that the thermal conductivity of k1 = 0.06 W/mK, k3 = 0.04 W/mK, and k4 = 0.12 W/mK. The thickness of the layers is L1 = 1.50 cm, L3 = 2.8 cm, and L4 = 3.50 cm. Known temperatures T1 = 30°C, T12 = 25°C, and T4 = -10°C. Energy transfer through walls is constant. How much is T34?
A wall as given in fig is made up of two layers (A) and (B) The temperatures are as shown in the sketch. The ratio of thermal conductivities of two layers is given as KA = 3 the ratio t, : t, is KB T2 = 1200 T, = 1300° C B T3 = 30 A