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But a "radiator" made of glass would not have too much area for temperature exchange or at least bee quite expensive...?

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Its called a distillation condenser.

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This will result in moisture, that drips into the bottle in the lower right.

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Not all the moisture condenses like that, you will have to use another method to help like a CaCl₂ bubbler or some such.

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This cool, dry air gets warmed by the warm air in the radiator and further heated by the fan dryer.

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Why not just suck in room temp air, through a drying tube https://www.rhodium.ws/chemistry/equipment/inline.gas.dryer.html into a heated blower (hair dryer? how are you going to attach the air inlet tube?) then into the box with your glass plates then just vent it for water evaporation or via a glass distillation aparatus to recover other solvents.

This sounds to me like alot of effort for a simple task which can be completed by using a normal glass distillation apparatus.