A continuous rectification column with a wetted wall is used to separate the A-B mixture. Its outer diameter is 30 cm, and its height is 4 m. If the column is adiabatically isolated, it operates at a reflux ratio R at capacity D (mol/h). Calculate the heat flux density that must be maintained in the heater, yes the values of R and D would remain unchanged in the case when the column is uninsulated and is in contact with still air at a temperature of 10C and a pressure of 1 atm. The outer surface of the uninsulated column has on top a temperature of 80C, and a temperature of 100C at the bottom.