A $1\mathrm{.}2-$m$-$diameter spherical tank of negligible thickness contains iced water at $0$C$.$ Air at

$25$C flows over the tank with a velocity of $0\mathrm{.}8$ m$/$s$.$ Determine the rate of heat transfer to

the tank and the rate $($in kg$/$min$)$ at which ice melts. The heat of fusion of water at $0$C is

$333\mathrm{.}7$ kJ$/$kg$.$

$4$

m

$1$

mV$,$ T $$