Calculate the Grash of number, the Nusselt number, the convective heat transfer coefficient (h), and the total heat transfer (Q_dot) in ambient air at Tinf = 30C for the following conjurations:
a) A vertical wall heated by sunlight to a temperature of 50C. Calculate for a single side only, the wall is 2m high and 6m long.
b) The interior of a vertical cylindrical chimney, Tw = 80C, 10m tall and 1m in diameter.
c) The four vertical sides and the top of a poorly-insulated refrigerator, 1m by 1m by 2m tall, Tw = 5C.