Temp Rise of Exhaust Steam While Condensing

Are you talking about steam or do you mean condensate?

i am telling about the temperature of the exhaust steam coming out of the turbine and the temperature of the condensate in the hot well pl.

What pressure do you measure in the condensor?

At 1 atm, anything over 100C would be causc to check calibrations. (could you be set at degF?)

Need to know where and how the temperature readings are being made to determine if they make sense. Sounds to me like bad temperature readings...

Particularly how are you measuring exhaust steam temperature? Are you sure you are not reading exhaust hood temp? Getting an accurate exhaust steam temperatue on a condensing turbine is a pretty difficult trick.

Latent heat of condensation. When the water vapor condenses, it give up a packet of heat to the surrounding media.

That is assuming that the temperature measurements are accurate.....

Yes, it gives up heat. But as you go thru phase change, the temperature remains constant. That's why it's called 'Latent', (meaning: "hidden")

check the calibration of meters...

I agree that you need to check your temperature instruments, but also look at where you are taking the temperature of the condensate. Is it right on the outlet of the condenser or is it after the pump? What is the pressure difference across the pump? The temperature will only remain constant if the pressure is also constant. You can also check the pressure of the exhaust steam with the temperature and compare it to the steam tables to find an error in the temperature instrument in the steam exhaust.

If the temperature measurements are accurate, perhaps you have other steam/condensate coming into the condenser near your measurement points. You have some good advise, and things to look over and check out. Instrument calibration is a potential problem. Compare the condenser pressure with the saturation pressure at the condenser temperature. This should offer some additional clues to perhaps muddy up the water. There is more than meets the eye here.

Hello ramaswamysrinivasan:

With regard to the sensors taking the readings...........are they insulated from the metal around them, or is it possible they are measuring the temperature of the local steel? From the sound of it there is either something extra exuding to make the rise in temp', or that sensor which has the higher reading is faulty, that is, as long as the pressure is constant. Are you tacking 'peak' temps or constant?

take care..............

What about flash steam?