In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that?

• A. Compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller
• B. Maintaining vacuum on tube side is more difficult than that on the shell side
• C. Water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam
• D. Condenser can act as a storage unit for condensed steam