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The problem lies in the excess amount of heat in the water, and the ability to pump hot water. Hot water has a tendency to flash into steam if it is too hot and will damage pumps when it does this.

More importantly for power plants, too much heat in the water prevents the condensers from condensing steam back into water, such that it will build up heat and backpressure in the exhaust hood of a turbine, reducing the amount of power the turbine can put out, as well as causing damage to the turbine blades, from moisture build up in the low pressure stages of the turbine. The vacuum created by condensing the steam keeps the steam in its vapor state in these stages.

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Q: Why water is cooled in a thermal power plant before reusing it?
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