A power plant burns natural gas to generate 750 MW of electricity with 38.5% efficiency. 88% of the waste heat is removed by cooling water.

a. Suppose the cooling water is taken from and returned to a river. If the water being returned to the river is allowed to be no more than 10 C warmer than the river water, calculate the flow of cooling water that is required in m³/s.

b. Alternatively, the cooling water can be cooled by allowing it to evaporate. If it evaporates at a temperature of 100 C, calculate the rate of loss of water to the atmosphere, in m³/s.