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Anonymous Poster

specific volume of water ?

06/03/2009 2:32 AM

GUEST #1 (Original poster and member of this forum)

Can anyone advice, how to calculate specific volume of 100g water (in form of moister content in a purifying fluid) when exposed to degassing (vacuum) chamber at 1 torr & 60 deg. cel ?

It is clear that phase transformation will take palce and referred perry hand book & www.spiraxsarco.com web site for dry, wet, satuarated steam table but could not concluded.
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PWSlack
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#1

Re: specific volume of water ?

06/03/2009 3:29 AM

It will be vapour at those conditions, and the specific volume can be found in Steam Tables. Try Mayhew & Rogers, "Thermodynamic Properties of Fluids", or Perry, "The Chemical Engineer's Handbook any edition, or even Kempe's Engineers' Yearbook, any edition.

This is a look-up task, not a calculation.

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Codemaster
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#2

Re: specific volume of water ?

06/04/2009 4:27 AM

Not quite clear what you're after, but the steam is superheated in these conditions (1 torr, 60°C). Saturation temp for 1 torr is about -19°C, saturation pressure for 60°C is about 149 torr. There is no liquid water in these conditions. Data I can find for superheated steam (Spirax etc) does not go to such low temp, but maybe it's out there somewhere.

If you can't find it, can estimate specific volume as

(760/1)*(22.4/18)*(273 + 60)/273 = 1154 m3/kg

Come back if you need explanation of above.

Cheers........Codey

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Anonymous Poster
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Re: specific volume of water ?

06/04/2009 4:42 AM

Well, it is very nice basic calculation of specific volume.

Thanks.
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