A large cooling tower serving a Rankine cycle power plant is to be placed in the desert. The ambient air can be assumed to have a relative humidity of 0%. The cooling tower receives water at a temperature of 45°C, and returns the water to the condenser of a power plant at the ambient air temperature. Saturated air exits the cooling tower at 40°C. The cooling tower receives 10,000 m3/s of ambient air. Power plant operation is affected by the ambient temperature throughout the day. Plot the rate at which makeup water must be added to the water returning to the condenser from the cooling tower and the percentage of water entering the cooling tower that is lost to evaporation as the ambient air temperature varies between 5°C and 40°C. Explain the results of the analysis. Discuss some ways in which the ambient air temperature will impact the performance of the power plant.
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