Design an internal cooling system for a chemical reactor. The reactor has a cylindrical shape 2 m in diameter, is 14 m tall, and is well-insulated externally. The exothermic reaction releases 50 kW/m³ of reacting medium, and the reacting medium operates at 250°C. It has been experimentally determined that the heat transfer coefficient between the reacting medium and a heat transfer surface inside the reactor is 1700 W/m² K. In designing the system, consider
(a) Capital cost

(b) Operating and maintenance cost
(c) How much volume is taken up by the cooling system inside the reactor and the concomitant reduction in reactor production 

(d) Availability of the removed heat for use outside the reactor

(e) Choice of cooling medium