Any heat exchanger system needs to deal with lint and condensate, and lint stuck onto wet surfaces. Easy cleanout is a must.
An easier approach is a home made condensing dryer. Hang the clothes indoors, then put a dehumidifier in the same room. No lint because the clothes are not being tumbled, it uses less electricity than an electric dryer, all of the condensate drains out the dehumidifier, and you get 100% efficient heat recovery.
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