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Power Plant Instrumentation and Control Handbook by Ajay Kumar Debnath, Swapan Basu

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7. Function and Description of CW and ACW Systems

The requirement of a condenser in a thermal power plant has already been discussed in Clause 2.8 of Chapter I and Clause 3.4 of this chapter. It is evident that when the condenser’s internal design is setup to allow the condensate to be cooler, the pressure of the exhaust steam pressure is also reduced according to the saturation condition and efficiency of the cycle (Rankine) increases.
The prime object of a circulating water (CW) system is to cool the LP turbine’s exhaust steam to convert it to condensate. Typically, the cooling water causes the steam to condense at a temperature of ∼45.4°C (113.7°F) and that creates an absolute pressure in the condenser of ∼0.1 kg cm2. The greatest volume change ...

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