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Dowtherm A semi-theoretical question

Dowtherm A semi-theoretical question

Dowtherm A semi-theoretical question

Suppose we have a vessel (e.g., a jacket on a stirred tank) full of Dowtherm A vapor at a known pressure (and let's say it's saturated vapor).  Now, we shut off the jacket so there is neither in- nor outflow, and let it cool down by losing heat to the atmosphere.

We have a fixed mass of Dowtherm A in the jacket, and as it cools, some condenses.  Naturally, the pressure in the jacket drops simultaneously.  Am I off base in presuming that at any given temperature, what we have in that sealed-off vessel is saturated Dowtherm A liquid in equilibrium with its vapor?

Further: I claim that from the starting conditions, we can establish how much Dowtherm A is in this vessel when it gets sealed off.  Then--in theory, at least--at any lower temperature/pressure, it should be possible via a flash calculation to establish what fraction of the mass exists as vapor (or liquid, take your pick).  Or did I miss something?

Thanks very much.

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