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ha, Ta Trasho ーLA Composite wall with contact resistance A plane composite wall (as shown in figure) is composed of two materials of thermal conductivity k- 0.7 W/m.K and k0.15 Wim. K. The contact resistance between the two materlals in R. 0.9 K/W. Materlal A is has a thickness LA-11.5 mm and exposed to a flukd at Tafy 495K and has ha-6 Wim. K. Material B has a thickness L 17 mm and exposed to a fuld at Tata- 400K and has h21 Wim. K Assume thermal p remain constant and nelegect heat generation. The Area of the wall is 1 m. How many thermal resistances are present in the system? properties OA 4 OB. 3 OC. 6 OD. 5 Which of the following staternent is true? DA. All thermal resistance ae in series B. Resistance due to conduction are in series but contact resistance is in paralel to resistance A and B C. Resistance due to conduction are in parallel but resistance due to convection are in serles D. Al thermal resistance are in paralel

ha, Ta Trasho ーLA Composite wall with contact resistance A plane composite wall (as shown in figure) is composed of two materials of thermal conductivity k- 0.7 W/m.K and k0.15 Wim. K. The contact resistance between the two materlals in R. 0.9 K/W. Materlal A is has a thickness LA-11.5 mm and exposed to a flukd at Tafy 495K and has ha-6 Wim. K. Material B has a thickness L 17 mm and exposed to a fuld at Tata- 400K and has h21 Wim. K Assume thermal p remain constant and nelegect heat generation. The Area of the wall is 1 m. How many thermal resistances are present in the system? properties OA 4 OB. 3 OC. 6 OD. 5 Which of the following staternent is true? DA. All thermal resistance ae in series B. Resistance due to conduction are in series but contact resistance is in paralel to resistance A and B C. Resistance due to conduction are in parallel but resistance due to convection are in serles D. Al thermal resistance are in paralel

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ha, Ta Tres ho Composite wall with contact resistance A plane composite wall (as shown in figure) is composed of two materials of thermal conductivity k = 0.7 Wim.K and ky= 0.15 Wim. K. The contact resistance between the two materlals in R. = 0.9 K/W. Material A is has a thickness L=11.5 mm and exposed to a fuld at Tiafy= 495K and has ha - 6 Wim. K. Material B has a thickness L17 mm and exposed to a fuld at Tta = 400K and has h21 Wim. K Assume thermal properties remain constant and nelegect heat generation. The Area of the wall is 1 m. How many themal resistances are present in the system? OA 4 OB. 3 OC. 6 OD. 5 Which of the following staternent is true? DA. All thermal resistance are in series B. Resistance due to conduction are in series but contact resistance is in parallel to resistance A and B C. Resistance due to conduction are in parallel but resistance due to convection are in series D. All thermal resistance are in paralel
Transcribed Image Text:ha, Ta Tres ho Composite wall with contact resistance A plane composite wall (as shown in figure) is composed of two materials of thermal conductivity k = 0.7 Wim.K and ky= 0.15 Wim. K. The contact resistance between the two materlals in R. = 0.9 K/W. Material A is has a thickness L=11.5 mm and exposed to a fuld at Tiafy= 495K and has ha - 6 Wim. K. Material B has a thickness L17 mm and exposed to a fuld at Tta = 400K and has h21 Wim. K Assume thermal properties remain constant and nelegect heat generation. The Area of the wall is 1 m. How many themal resistances are present in the system? OA 4 OB. 3 OC. 6 OD. 5 Which of the following staternent is true? DA. All thermal resistance are in series B. Resistance due to conduction are in series but contact resistance is in parallel to resistance A and B C. Resistance due to conduction are in parallel but resistance due to convection are in series D. All thermal resistance are in paralel
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