Natural Science Forum / Physics / General Physics / March 2007

I'm working on a liquid desiccant dehumidifier. The way that would
work is that a calcium chloride brine is sprayed through humid air
absorbing moisture. Later that solution is reconcentrated (regenerated)
by spraying the brine through hot air driving off the moisture in the brine.

An example is here:

  <URL:
http://www.samedanltd.com/members/archives/PMPS/Winter2001/KoenEgberts.htm
/>

  So my question is at what point is the reaction driven toward the
brine absorbing moisture versus releasing moisture?

  Is this at the point where the enthalpy of the humid air equals the
enthalpy of the brine?

  If so, how do I find the enthalpy of differing concentrations of
calcium chloride solution? How would I find the enthalpy of a solution
of two different salts (calcium chloride and lithium chloride). Tables
for the enthalpy of humid air are readily available.

  My end goal is solar AC.  I hope this is not OT here, or too dumb of
a question. Is there another group which may be more appropriate, this
languished over in alt.solar.thermal.

  Jeff