Solar powered crawl-space dehumidifier?
I live in Texas where the humidity in the summer can be quite high and where the use of crawl space vents can be counter-productive. I have installed a vapor barrier over the crawl-space soil and have blocked all the crawl space vents.
I have been exploring the possibility of of using hot attic air in conjunction with a silica-gel based dehumidifier to lower the humidity in the crawl space. The idea is to circulate the crawl space air over thin beds of silica-gel during the evening to absorb excess moisture. During the day warm air from the attic would be blown over the silica gel and exhausted outside to desorb moisture from the silica gel beds.
initial calculations indicate that I should be able to keep the humidity in a 1200X3 foot crawl space with about 5 pounds of silica gel assuming an ambient temperature of 78 degrees in the crawl space and a minimum of 120 degrees F attic air using a small fan able to move 112 CFM.
A collateral benefit of this methodology is that the attic temperature would be lowered to some extent by removing some of the heat during the day.
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