Consider a 5-m-high, 8-m-long, and 0.22-m-thick wall whose representative cross section is as given in the figure. The thermal conductivities of various materials used, in W/m•K, are k4 = kf= 2, kB = 8, kc= 20, kp= 15, and kɛ = 35. The left and right surfaces of the wall are maintained at uniform temperatures of 300°C and 100°C, respectively. For this problem (a) Using the resistance concept, draw the equivalent resistance circuit, (b) calculate the individual resistances, (c) Determine total resistance, (d) the rate of heat transfer through the wall. Disregard any contact resistances at the interfaces. (25 pts) 100 °C 300 °C 4 сm B 6 ст D 8 cm 6 ст F E 1 cm 5 cm 10 cm 6 ст

Consider a 5-m-high, 8-m-long, and 0.22-m-thick wall whose representative cross section is as given in the figure. The thermal conductivities of various materials used, in W/m•K, are k4 = kf= 2, kB = 8, kc= 20, kp= 15, and kɛ = 35. The left and right surfaces of the wall are maintained at uniform temperatures of 300°C and 100°C, respectively. For this problem (a) Using the resistance concept, draw the equivalent resistance circuit, (b) calculate the individual resistances, (c) Determine total resistance, (d) the rate of heat transfer through the wall. Disregard any contact resistances at the interfaces. (25 pts) 100 °C 300 °C 4 сm B 6 ст D 8 cm 6 ст F E 1 cm 5 cm 10 cm 6 ст

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.1P: 1.1 On a cold winter day, the outer surface of a 0.2-m-thick concrete wall of a warehouse is exposed...

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1.1 On a cold winter day, the outer surface of a 0.2-m-thick concrete wall of a warehouse is exposed to temperature of –5°C, while the inner surface is kept at 20°C. The thermal conductivity of the concrete is 1.2 W/m K. Determine the heat loss through the wall, which is 10-m long and 3-m high. Problem 1.1
Syies Consider a 5-m-high, 8-m-long, and 0.22-m-thick wall whose representative cross section is as given in the figure. The thermal conductivities of various materials used, in W/m K are ka = KE = 26, ke = 11, ko= 26, kp. = 14, and kE = 37. The left and right surfaces of the wall are maintained at uniform temperatures of 300°C and 100°C, respectively. Assume heat transfer through the wall to be one-dimensional. I 100°C 300 C A4 cm 6 cm B. 4 cm El tC 6 cm 4 cm 8 m 1 cm 5 cm 10 cm 6 cm (2) 4.1) Draw a representation of the thermal resistance network (28) 4.2) Determine the rate of heat transfer through the wall. (5) 4.3) Find the temperature at the point where the sections B, D, and E meet. 4.4) Calculate the temperature drop across the section F. Disregard any contact (5) resistances at the interfaces.
Required information Consider a 5-m-high, 8-m-long, and 0.22-m-thick wall whose representative cross section is as given in the figure. The thermal conductivities of various materials used, in W/m-K, are kA=kF=2, kg-8. kc-20, kp=15, and ke-35. The left and right surfaces of the wall are maintained at uniform temperatures of 345°C and 100°C, respectively. Assume heat transfer through the wall to be one-dimensional. Disregard any contact resistances at the interfaces. 1 cm. A4 cm B 4 cm रेव 4 cm Sem 6 cm DI 4 E 6 cm F 10 cm 6 cm 100°C 8m Determine the rate of heat transfer through the wall (in W).
Consider a 2 m-high and 0.7 m-wide bronze plate whose thickness is 100mm. One side of the plate is maintained at a constant temperature of 600 K while the other side is maintained at 400 K, as shown in figure below. The thermal conductivity of the bronze plate can be assumed to vary linearly in that temperature range as k(T) = k.(1+ $T ) where ko = 38 W /m · K and ß = 9.21x 10-*K-1. -kT) = k,(1 + BT) Bronze plate 7, = 600 K T,- 400 K
Consider a wall that is 5 m high, 8 m long, and 0.22 m thick. The thermal conductivities of the various materials used, in W/m °C, are kA = kF = 2, kB = 8, kC = 20, kD = 15 and kE = 35. The left and right surfaces of the wall are maintained at uniform temperatures of 300 °C and 100 °C, respectively. If the heat transfer through the wall is one-dimensional, determine (a) the rate of heat transfer through the wall; b) the temperature at the point where sections B, D, and E meet, and c) the temperature drop across section F. Disregard any contact resistances between the interfaces.
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 ka = 0.12 W/m.K (k) 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? ki ks T T4 T12 T23 L L3
A small storage room has the dimensions of 20 m X 20m X 3m high. The walls of the storage consist of three layers; Fiberglass (thickness = 2 cm, K = 0.1 W/mK), and Brick (thickness = 8 cm, K = Ó.5 W/mK). On one of the walls, there is one small wooden door with the dimensions of 0.9 m X 2 m and thickness of 3 cm. The thermal conductivity of wood is 0.4 W/mK. The inside temperature of the storage room is to be maintained at 20°C, while the temperature outside is 0°C. The rate of heat lost through the roof is 30 kW. Heat loss through the floor can be ignored. a) Calculate the total heat loss from the storage room (kW).
20-m pipe has an outside diameter of 50 mm. Pipe is insulated with a layer of asbestos, then followed by a layer of cork. Inside and outside diameter of the cork is 77 mm and 80 mm, respectively. If the temperature drop from pipe to cork is 1165°C, calculate the inside diameter of the pipe (mm). The rate of the heat transfer is 8778 W. The thermal conductivity of steam pipe, asbestos and cork are 0.045 kW/m-K, 0.058 W/m-K and 0.043 W/m-K respectively.
1/ The roof of an electrically heated home is 6 m long, 8 m wide, and 0.25 m thick, and is made of a flat layer of concrete whose thermal conductivity is k = 0.8 W/m.°C (Figure. 1-3). The temperatures of the inner and the outer surfaces of the roof one night are measured to be 15°C and 4°C, respectively, for a period of 10 hours. Determine the rate of heat loss through the roof at night
Ponder upon a 5-m-high, 8-m-long, and 0.22-m-thick wall whose representative cross section is as given in the figure and this pattern in the construction of this wall repeats along the vertical orientation. The thermal conductivities of numerous materials used, in W/m · deg. C, are ka = kF = 2, kg = 8, kc =20, kp = 15, and kɛ = 35. The left and right surfaces of the wall are preserved at uniform temperatures of 300 deg. C and 100 deg. C, respectively. Supposing heat transfer through the wall to be one-dimensional, determine (a) the rate of heat transfer through the wall; (b) the temperature at the point where the sections B, D, and E meet; and (c) the temperature drop across the section F. Disregard any contact resistances at the interfaces. 100°C 300°C D A4 cm F 6 cm 4 cm E 6 em 4 cm 8 m 1 cm 5 cm 10 cm | 6 cm
The thermal conductivity of a sheet of rigid, extruded insulation is reported to be k = 0.029 W/m-K. The measured temperature difference across a 25-mm-thick sheet of the material is T – T2 = 12°C. (a) What is the heat flux through a 3 m x 3 m sheet of the insulation, in W/m2? (b) What is the rate of heat transfer through the sheet of insulation, in W? (c) What is the thermal resistance of the sheet due to conduction, in K/W?
The thermal conductivity of a sheet of rigid, extruded insulation is reported to be k = 0.029 W/m-K. The measured temperature difference across a 25-mm-thick sheet of the material is T| – T2 = 10°C. (a) What is the heat flux through a 3 m x 3 m sheet of the insulation, in W/m?? (b) What is the rate of heat transfer through the sheet of insulation, in W? (c) What is the thermal resistance of the sheet due to conduction, in K/W? Part A What is the heat flux through a 3 m x 3 m sheet of the insulation, in W/m2? i W/m?