At high vacuum saturation temperature corresponding to vacuum drops which means more heat rejection but how this effect cooling water temperatures. As cooling water now have to absorb more heat
The system design ought to address the issue of vacuum as it is important to both the turbine operation and the condenser.
If the vacuum is lower than the design value the steam at the last stages of the turbine can become very wet and erode the blades rapidly. Normally, the turbine controls should protect against excessive vacuum. The cooling system design will be for the worst expected ambient conditions, e.g. warmest water in summer (or high air temperatures if an ACC is used). The cooling circuit ought to be controlled by the vacuum setting.
There are numerous papers written on steam surface condensers plus there's the HEI standard plus ASME PTC 12.2 and others. What "vacuum drops"? Are you referring to air in leakage resulting in less vacuum (greater pressure)? There are many papers on this subject too.
Rana Hamza Shakil and Jack Broughton , Thanks for your time.
High vacuum means low back pressure this will also lead to decrease dryness fraction at last stage of turbine.
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