1.

A brick wall 19 cm thick has a thermal conductivity 0.811 W/m C. The outside and inside surface conductance of the wall are 16 W/m2 C and 8 W/m2 C respectively, then the U-value of the wall in W/m C is ____________

A. 4.50 to 4.95
B. 3.50 to 4.45
C. 2.30 to 2.45
D. 5.50 to 6.45
Answer» D. 5.50 to 6.45


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