what is the amount of water required to reduce the surface temperature of the furnace shell from $1900$ deg. C to $200$ deg. C$.$ The water should be flowing over the furnace shell. The heat input inside the furnace is $10000000$ kcal$/$hr$.$ The furnace ID is $260$ mm and lenght is $240$ mm$.$ Also determine the diameter of water jacket required for this water to flow. The water inlet temperature is $50$ deg. C and exit temperature should not exceed $70$ deg. C$.$