On 16 Aug 2006 11:02:25 -0700, "Robert Clark"
wrote:

Eeyore wrote:
Robert Clark wrote:

For my application I need a hydrogen/oxygen fuel cell to produce the
H2O in liquid form. But in addition to the electrical energy, the
reaction releases a significant proportion of the energy as heat.
Enough heat in fact to turn the H2O released into steam. I know on
space missions they use fuel cells to produce liquid water but I assume
they use the cryogenic fuels onboard to liquify the water.
Is there a way to insure the water released is in liquid form for the
H2 and O2 at room temperature?

Cool the water vapour.

Graham

A heat exchanger (radiator) might do it. Or quickly exapnding it into
a larger volume.
For my application I want the system to be lightweight.

Bleed liquid nitrogen to the atmosphere close to the outlet. Slowly!
Be careful, or you will get to very low temperatures indeed.

Recently, I was doing some work with a little heated/cooled stage for
samples for a spectrometer. Someone left the nitrogen leaking away for
a few minutes, and the temperature control software stopped working.
We waited for a quater of an hour, and the software started working
again with the thermocouple reporting minus 60C.

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