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A wall has inner and outer surface temperatures of 16 and 6 C, respectively. The interior and exterior air temperatures are 20 and 5 C, respectively. The inner and outer convection heat transfer coefficients are 5 and 20 W/m²K, respectively. Calculate the heat flux from the interior air to the wall, from the wall to the exterior air, and from the wall to the interior air. Is the wall under steady-state conditions? KNOWN: Inner and outer surface temperatures of a wall. Inner and outer air temperatures and convection heat transfer coefficients. FIND: Heat flux from inner air to wall. Heat flux from wall to outer air. Heat flux from wall to inner air. Whether wall is under steady-state conditions. SCHEMATIC: Outer surface Air T=20°C h, 5 W/m²-K 9"x-w T=6°C dE/dt T=16°C Air T=5°C h=20 W/m²-K Inner surface ASSUMPTIONS: (1) Negligible radiation, (2) No internal energy generation.

A wall has inner and outer surface temperatures of 16 and 6 C, respectively. The interior and exterior air temperatures are 20 and 5 C, respectively. The inner and outer convection heat transfer coefficients are 5 and 20 W/m²K, respectively. Calculate the heat flux from the interior air to the wall, from the wall to the exterior air, and from the wall to the interior air. Is the wall under steady-state conditions? KNOWN: Inner and outer surface temperatures of a wall. Inner and outer air temperatures and convection heat transfer coefficients. FIND: Heat flux from inner air to wall. Heat flux from wall to outer air. Heat flux from wall to inner air. Whether wall is under steady-state conditions. SCHEMATIC: Outer surface Air T=20°C h, 5 W/m²-K 9"x-w T=6°C dE/dt T=16°C Air T=5°C h=20 W/m²-K Inner surface ASSUMPTIONS: (1) Negligible radiation, (2) No internal energy generation.

Elements Of Electromagnetics
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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A wall has inner and outer surface temperatures of 16 and 6 C, respectively. The interior and exterior air temperatures are 20 and 5 C, respectively. The inner and outer convection heat transfer coefficients are 5 and 20 W/m²K, respectively. Calculate the heat flux from the interior air to the wall, from the wall to the exterior air, and from the wall to the interior air. Is the wall under steady-state conditions? KNOWN: Inner and outer surface temperatures of a wall. Inner and outer air temperatures and convection heat transfer coefficients. FIND: Heat flux from inner air to wall. Heat flux from wall to outer air. Heat flux from wall to inner air. Whether wall is under steady-state conditions. SCHEMATIC: Outer surface Air T=20°C h, 5 W/m²-K 9"x-w T=6°C dE/dt T=16°C Air T=5°C h=20 W/m²-K Inner surface ASSUMPTIONS: (1) Negligible radiation, (2) No internal energy generation.
Transcribed Image Text:A wall has inner and outer surface temperatures of 16 and 6 C, respectively. The interior and exterior air temperatures are 20 and 5 C, respectively. The inner and outer convection heat transfer coefficients are 5 and 20 W/m²K, respectively. Calculate the heat flux from the interior air to the wall, from the wall to the exterior air, and from the wall to the interior air. Is the wall under steady-state conditions? KNOWN: Inner and outer surface temperatures of a wall. Inner and outer air temperatures and convection heat transfer coefficients. FIND: Heat flux from inner air to wall. Heat flux from wall to outer air. Heat flux from wall to inner air. Whether wall is under steady-state conditions. SCHEMATIC: Outer surface Air T=20°C h, 5 W/m²-K 9"x-w T=6°C dE/dt T=16°C Air T=5°C h=20 W/m²-K Inner surface ASSUMPTIONS: (1) Negligible radiation, (2) No internal energy generation.
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