Does steam temperature change with air pressure?

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Offline thedoc

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Does steam temperature change with air pressure?
« on: 14/07/2012 00:30:01 »
Dipesh S Shah  asked the Naked Scientists:
   
Dear Mr Chris,

Greetings to you.

I am writing a mail first time to you seeking your help.

In our plant, we have a Kettle into which we provide steam and raise the temperature to cook a product. The final temp we require is 85 deg C. There is also a vacuum pump attached to it. My question is will there be any variation in temperature if there is a change in vacuum.

Looing forward to your reply soon.

Regards

Dipesh Shah

What do you think?
« Last Edit: 14/07/2012 00:30:01 by _system »

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Offline Geezer

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Re: Does steam temperature change with air pressure?
« Reply #1 on: 14/07/2012 00:45:23 »
Yes; if you evacuate the kettle and maintain it below atmospheric pressure, the water will boil at a lower temperature, so you could maintain a constant temperature in the kettle with a vacuum pump. However, it might be simpler (and a lot more economical) to control the device that is heating the kettle with a thermostat of some sort to maintain the water temperature at 85 deg C.
There ain'ta no sanity clause, and there ain'ta no centrifugal force Šther.