Engineering, 13.06.2020 16:57 7letters22

A person puts a few apples into the freezer at -15oC to cool them quickly for guests who are about to arrive. Initially, the apples are at a uniform temperature of 20 oC, and the heat transfer coefficient on the surfaces is 8 W/m2 oC' Treating the apples as 9-cm-diameter spheres and taking their properties to be, Cp = 3.81 kJ/kg oC, k = 0.418 W/m .OC, and =1.3 X l0 -7 m2/s, determine the center and surface temperatures of the apples in 1 h. Also, determine the amount of heat transfer from each apple.

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