The purpose of a clothes dryer is to remove moisture. All that moisture would be going into your enclosed growing area. By using the exhaust you would have some terribly high humidity in whatever greenhouse setup you wanted to heat. Loads of condensation, etc. Not to mention the inconsistency of the warming, etc.
I'm not a greenhouse grower, but it sounds like a mess to me.
I don't know anything about the Carbon Monoxide output from dryers which nascarmike mentions, but that would be truly dangerous!
Capturing the heat is an interesting idea, but it seems it may be alot more complicated than just dumping the exhaust straight into a green house.
Kurt
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