Mechanical and Materials Engineering Homework Solutions
Problem
#2908

Calculating temperature, water evaporation, and heat in a power plant cooling situation.

In a nuclear power plant the cooling tower system must be run on a closed cycle.  That is, the air exiting the tower passes over cooling coils to return it to its initial condition prior to reentering the tower.  Air at 20C and 40% relative humidity enters the tower at a rate of 1.3 x 106 kg/sec.  Water enters the tower at 50C and leaves at 25C.  The water flow rate is 750,000 kg/sec. Saturated air exists the tower and passes over cooling coils which returns it to 20C and 40% relative humidity.  Water at 22C condenses out of the air.  Determine:

A) The temperature of air leaving the tower
B) Amount of water evaporating in kg/sec.
C) The heat removed by the cooling coils in kW

Solution
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