A system with natural convection shall be used for heat rejection of an Intel Atom N270 chip (see. Figure 1). Maximum heat generation rate for the N270 is reported to be 2.5 W . Passive cooling shall be achieved with a rig that consists of fins with rectangular cross section each with a height of H=5mm and a thickness of t=1mm, spacing between fins is given as s=8mm. Convection coefficient is given as 6(W)/(m^(2)).K. Find the width (W) of the cooling rig that can provide a temperature difference T_(b)-T_(\infty )=35\deg C between the fin base and the ambient.
Figure 1: Atom N270 Processor Cooling Rig