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Viktor, 
I also thought of comparing the drysuit microclimate issue to the
heat/humidity/vapor transfer problems known in architectural
engineering.
Maybe the same formulae can be made to work with drysuits. Sorry I do
not have the time to do this now.

Sems there are szenarios where suits/ undergarment are getting wet
outside, and other where humidity is kept inside the tissue.
The question of comfort seems to be how near to the body the humidity is
kept.
strange enough , the most comfortable drysuitdives I did ( climatewise)
where those with a membrane type suit ( viking) and woolen heavy gear
undergarments on polypropylen bodywear.
regards
Matthias

Viktor Sajn schrieb:
> 
> Hi!
> 
> If you have proper undersuit (from Thinsulate) on
> longer dive, where the most of body moisture is
> concentrated? Is it usual to condensate in between
> undersuit and internal side of the dry suit? On
> technical way body put latent energy in
> evaporation of the water and it is released on the
> inside part of the dry suit to outside. So this
> can be significant way of energy loss. It this
> case thickness of insulation are not helping just
> resistance of material against water vapor
> pressure. The problem is the similar with the
> insulation of the houses with mineral wool (which
> is hygroscopic) in alp or northern part of the
> Europe. In this case the steam block is used -
> foil to prevent house moisture to get in
> insulation (it is hygroscopic and Thinsulate is
> not) and also to prevent to leave the house (of
> course in winter time). Maybe astronauts have the
> similar problems with body vapor. Some interested
> information - suggestion?
> 
> B.r.
> 
> Viktor
> 
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