Steam is to be condensed in the condenser of a steam power plant at a temperature of

Question:

Steam is to be condensed in the condenser of a steam power plant at a temperature of 50°C with cooling water from a nearby lake that enters the tubes of the condenser at 12°C at a rate of 240 kg/s and leaves at 20°C. Assuming the condenser to be perfectly insulated, determine
(a) The rate of condensation of the steam and
(b) The rate of exergy destruction in the condenser.