Since my post above I have spent some time investigating the Continuous Dry Kiln.
One experiment we did was to dry a charge of 2" dimension SYP, pull out one of the dry tracks and replace it with a green track and then run with fans only for 6 hours. A 2x10x16 from the "dry" track had lost 7,660 lbs of water. A stack of 2x10x16 from the green track had lost 1220 lbs of water. Not bad for just 6 hours and the heat from the other track.
Yet, in the CDK I feel that heat that is recaptured in the "conditioning chambers" is coming from the hot moist air from the main kiln chamber that migrates into the conditioning champers consequeintly being circulated through the lumber, heat transferred to the lumber, and the moisture condensed out on to the floor.
In our experiment above we witnessed no liquid moisture in the kiln. Yet, reports are given of a "rain forest" effect going on in the conditioning chamber.
I feel that liquid moisture in the conditioning chamber is a result of the hot moist air in the kiln migrating over to the con. ch. Its a good thing, there's a lot heat there to be captured.