An external wall of a building has a U value of 0.50 W/m^2K. The indoor temperature is 21 degreesC and the outdoor temperature is -2.0 degreesC. If the combined surface heat transfer coefficient (radiation plus convection) of the outside wall is 12 W/m^2K, determine its surface temperature. answer = -1.04degreesC please show all workings

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 1.56P: A pipe carrying superheated steam in a basement at 10C has a surface temperature of 150C. Heat loss...
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An external wall of a building has a U value of 0.50 W/m^2K. The indoor temperature is
21 degreesC and the outdoor temperature is -2.0 degreesC.

If the combined surface heat transfer coefficient (radiation plus
convection) of the outside wall is 12 W/m^2K, determine its surface
temperature.

answer = -1.04degreesC

please show all workings

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wouldn't your last equation be Q/A= H (Tair-Tsurface)

 

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