Hi Peter and all,Earth tubes almost can't avoid moisture and molds making air
versions dangerous to breathe air from them. You really need a coolant based
system, not air.Minisplits are a far better solution and some work directly
from batteries now both in 48vdc and 365vdc nom.. I hear some variable AC ones
can work from batteries as just rectified anyway for the variable speed
inverter.I see a future where much of home high power loads run on 365vdc
nominal directly from home solar, batteries and EVs packs both charging and
using for home power with cheap DC-DCs pushing it where you want it to go in or
out of the EV.And as a microgrid sharing bus.Though it's looking like V2G will
be common next yr with VW and Lucid forcing Tesla, others to compete. .Jerry
Dycus
On Saturday, March 20, 2021, 09:52:16 PM PDT, Peter VanDerWal via EV
<[email protected]> wrote:
Bobby, have you done any research on Earth Tubes? Not just looking up
testimonials and anecdotes, but looked for actual studies?
I was really yped about earth tubes for a while until I looked into them and
found a few studies. I found a lot of people claiming that all they did was
dig 2 foot deep trenchs and burried 30 feet of tube and 'Wow, what a difference'
But the actual studies with measurements, etc. tell a different story.
First of all you need to go a LOT deeper than 2 feeet, 6-8 foot minimum.
One study I found was done in India as I recall, they were studying using Earth
Tubes to cool a green house.
They used 4 tubes 100 feet long, 8 foot deep spaced 6 feet apart. The fan used
to drive the air through them consumed 400-450 watts and ran 24 hours a day.
It was effective at the begining of summer, but by the middle of summer the
output air temps had climbed to around 80 degrees, the green house temps were
closer to 90 degrees.
I also read lots of feedback from individuals that were having problems with
mold due to condensation in the earth tubes. That is solvable, by making sure
the tubes angle down, away from the house and you have some way to drain the
moisture from them.
My mini-split heat pump on the other hand uses about 1/2 the energy per day to
cool my house and output air temp is around 50-60 degrees an the temp in the
house stays below 76. I could get it cooler, but it would use more energy and
I'm comfortable at that temp.
So the mini-split is more effective, for less energy and a LOT less work to
install. If you have to hire someone to dig the trenches, the mini-split is
probably cheaper.
Sometimes the best solution is NOT the simplest solution.
My PGP public key: https://vanderwal.us/evdl_pgp.key
March 19, 2021 6:05 PM, "Bobby Keeland via EV" <[email protected]> wrote:
> In a previous posting I said:
> <Unfortunately I’m still working on my solar
> <water heater, my battery backup for the solar
> <panels, earth tubes and many other
> <projects.
>
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