An additional point to add on to Dave's:
If you are blowing air at 85 degrees and 90 percent humidity into a
buried conduit that might be at about 55-60 degrees, condensation will
also occur. The concrete slab in my carport "sweats" condensation every
time the wx here shifts(frequently), and the temperature differentials
are usually less.
Maybe an exhaust fan, but the air coming in would still need to have a
humidity level lower than the dew point at the expected temperature
inside the conduit.
73 de w4kaz
> I see a couple of flaws:
> a. A fan won't push air through a long tube. You need a pump that can
> actually generate some pressure.
> b. Now you have a higher pressure area in the feed from the pump
> exiting to a lower pressure area in the tube, the result of which
> typically generates condensation. You have a similar pressure
> differential near the output of the tube. They put condensate drain
> plugs on compressor tanks for a reason.
> Dave AB7E
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