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
Options:
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
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