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Applying cooling at Condenser!

Thursday, January 26, 2017   By: P I [1983] 3 Stars
We have an STG based thermal power plant in our hand and the steam flow rate is around 10 kg/sec or 36000 kg/hr. The Condenser is kept at 10 kPa pressure and the temperature there is 45°C. Now, a cooling system of capacity 142 ton of ice has been applied to the Condenser. I dont want to give details of the cooling system here, but consider that 142 ton of ice at 0°C per day i.e. 5.923 ton ice at 0°C per hour has been continuously added to the Condenser.
I want to know what can be the possible temperature and pressure at the Condenser if such a cooling has been added. With the previously mentioned set up, the output was 10 MW. I also want to know how much increase in output can be achieved with that kind of cooling.

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Sunday, January 29, 2017   By: old timer [21] 4 Stars
Your conditions of 32f or 0c temps for condenser inlet temperature is experienced when steamers are in Antarctic waters or Arctic waters. Yes, you are going to use ice, but ice seems very inefficient. But, you just need to work out your math.

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Sunday, January 29, 2017   By: P I [1983] 3 Stars
Its not ice, but rather a cooling system equivalent to ice. As per my calculations, with such a cooling, the temperature at the Condenser will come down to 20°C and 0.023 barA pressure. Now, if the previous level was set at 45°C and 10 kPa pressure, what would be the increase in output by % with such a change?

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Saturday, February 18, 2017   By: Jim Watts [764] 5 Stars
THe minimum condenser pressure is set by air ejector efficiency as well as the cooling.
You should check if your condensate temperature matches you condenser pressure now.
Extra cooling may only produce sub cooled condensate.

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Thursday, March 02, 2017   By: P I [1983] 3 Stars
That means, if the pressure level at the Condenser can be set a proper level, then the power output and efficiency can be increased by further cooling of the Condenser, right?

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Friday, March 03, 2017   By: Jim Watts [764] 5 Stars
Im sure you already know that in principle the lower the condenser pressure the higher the efficiency and therefore your answer should be an increase in generation.
If this was a turbine designed for the lower condenser it would be so.
If the turbine was designed for a higher condenser pressure and it is operated at a lower pressure it may not be so.
This is because the reduced exhaust pressure expands the steam further until it no longer fits through the exhaust space and a pressure drop developes between the turbine outlet and the condenser. This results in condensate at a lower temperature than the saturation temperature at the exhaust and is therefore subcooled and reduces the system efficiency ie increases heat rate.
Your question is only answerable in theory, and any number produced would not justify your exotic ice.

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Friday, March 03, 2017   By: P I [1983] 3 Stars
I am not recommending to use ice at the Condenser. What I want to define is the amount of cooling by the ton ice I mentioned in my first post. Kindly dont think that I want to use ice at the Condenser.

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Is Cp/Cv applicable to steam to calculate?
By: Kent mayhew [2161]

The reason that isobaric Cp heat capacity is greater than isometric Cv is that isobaric involves expansion. Remember our atmosphere has mass, so in order for a system to expand it must displace that mass. And this requires work. So Cp requires work plus the energy to heat the gas , while Cv only requires the energy to heat.

So for all gases and/or steam the work required to expand a given volume is the same that being the work required to displace our atmosphere by a given volume.

Hence t....   Read All
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