Gary Gary, I like your build-up and if you can get anywhere near the 80% efficiency, that would be great. Are you planning on having two blowers, perhaps the existing dryer's with the additional one in your mock-up?
I remember reading somewhere that for a lot of clothes, the high temperatures in modern dryers actually degrade and wear out fabric. Another approach would be to lower the temp. and force the air, like hanging your clothes out to dry on a cool windy day instead of a hot muggy day. I don't know what the difference would be on the HX if you were, in effect, decreasing the delta-T between the two air flows while increasing the velocity.
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