D 150 mm wide. Assume the plates are negligibly thin, and that the natural convection air flow adjacent to the plates is not affected by the presence of the neighboring plates. The temperatures of the surface of the plates and the air are 90C and 14C, respectively. Consider the following: i) Determine the natural convection heat transfer coefficient (W/m2 C) for each vertical surface. ii) Calculate the rate of heat transfer (W) from