A flat plate has thickness 5 cm, thermal conductivity 1 W/mK, convecti – McqOptions

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1.	A flat plate has thickness 5 cm, thermal conductivity 1 W/mK, convective heat transfer coefficients on its two flat faces of 10 W/m2K and 20 W/m2K. The overall heat transfer coefficient for such a flat plate is
A.	5 W/m2K
B.	6.33 W/m2K
C.	20 W/m2K
D.	30 W/m2K
Answer» B. 6.33 W/m2K

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