Damn, i gotta stop making big posts.
Forgot to make a comment.
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Dehumidifiers solve the high relative humidity (RH) problem by simply pulling the moisture out of the air.
A small fan pulls the rooms humid air into the dehumidifier and the air is passed through a cooling coil and is chilled to its dew point on a cold surface where condensation occurs, similar to a refrigerator. The condensation then is then released into a bucket or is released through a hose. The moisture reduced air is then heated back to room temperature and blown out into the room.
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But. Because of the non fan setup pictured by BladeRunner, the air current formed (theory) wont maintain a very low temperature after passing through the radiator. In fact it will be cooler than ambient, but the cooling system is already cooler than ambient as it is , in particulary the blocks and tubes (due to the nature of BR setup). So no harm done there , assuming not that large detal T. It will (theory) have less RH , which is the whole point. Cooler than ambient, less RH , very low risk of condensation . In theory of course.
It's all very nice in theory but only by testing it (IMO) can be see what are the real flaws. Alot of tweaking can be done , shape , size, temperature of the chimney, etc etc etc.
Sorry about the jumps. I've got the organize my posts better.

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