Exhaust gases from a wire processing oven are discharged into a tall stack, and the gas and stack surface temperatures at the outlet of the stack must be estimated. knowledge of the outlet gas temperature tm o is useful for predicting the dispersion of effluents in the thermal plume, while knowledge of the outlet stack surface temperature ts'0 indicates whether condensation of the gas products will occur. the thin-walled, cylindrical stack is 0.5 m in diameter and 5 m high. the exhaust gas flow rate is 0.5 kg/s, and the inlet temperature is 500 degree c. the ambient air temperature is 4 degree c. calculations that are a little beyond where we are now in tf1 show that the average surface heat transfer coefficient in the outside surface is h0= 14 w/m2 k, and the inside heat transfer coefficient is hi= 10 w/m2 k. the thermal resistance of the stack wall itself may easily be neglected. estimate the outlet gas and stack surface temperatures for the given conditions.