A plaster wall which is 20 cm thick with a thermal conductivity of 0.3W/m2 C is used in a certain house. The inner wall temperature is at 40C, and the outer wall is exposed to ambient wind and the...

Extracted text: A plaster wall which is 20 cm thick with a thermal conductivity of 0.3W/m2 C is used in a certain house. The inner wall temperature is at 40C, and the outer wall is exposed to ambient wind and the surroundings at 12C. The film coefficient, h, for convective heat transfer in a 10m/s wind is about 21W/m2C. Ignoring any radiation losses, find the overall coefficient for the conduction and convection losses in W/m2 C О а. 1 O b. 10.1 О с. 1.4 O d. 8.1