gascorts idea is very similar to a direct vent fireplace. A tube within a tube acts like a heat exchanger boosting the intake air temp as it moves to the dryer and allowing a cooler setting on the dryer saving energy. Some heat needs to remain in the exhaust so condensation will not occur.
Alternatively or in addition, an automotive type intercooler (like used on turbocharging applications) with a fan could be used to draw heat out of the air, there would need to be a path for water to drain.
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