Do you know what is the purpose of cooling water circuit in Steam power plant ??

Do you know what is the purpose of cooling water circuit in Steam power plant ??

The quantity of cooling water required to condense the steam is considerably large and is taken from lake, river or sea. 

The cooling water is taken from upstream side of the river, it is passed through the condenser and the heated water is discharged at downstream side of the river. Such a system of cooling water supply is possible if adequate cooling water is available throughout the year. The system is known as Open System. 

When the adequate water is not available, then the water coming out from the condenser is cooled in either cooling pond or cooling tower. The cooling is affected by partly evaporating the water. This evaporation loss (including carry over) is nearly 2% - 5% of the cooling water circulated in the system. To compensate this evaporation loss, the water from the river or other sources has to be continuously supplied. The water from the cooling tower or the cooling pond is again supplied to the condenser. This system is known as Closed System.

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