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re: piecing a solar power system together....
27 oct 2003
mitch dickson wrote re:
>a 24 foot by 4 foot solar furnace laced with 3/4 inch black pipe...
some possible improvements:
1. make the tank 12'x16'x4' tall, with r30 wall and cover insulation (6"
fiberglass under 2" foamboard) and 2" foam beneath and a $150 20'x24'
folded epdm liner and a 12,288xr30/608ft^2 = 606 hour time constant.
2. lay a 4'x16' strip of pv panels (about 640 peak watts) along the north edge
of the cover, with a $6 16' length of 30" round poly film greenhouse duct
laid flat on top of the panels. pump water up through the duct during the
day, and let it drain down at night.
3. make a 16' (ew) by (y=) 11.3' tall foamboard reflector with an approximate
4' focal length (y^2=16x, aimed at the southern horizon), starting at the
north edge of the cover (0,0) and line the underside with reflective mylar
film, using axle grease for glue.
4. make a sloping clear polycarbonate south wall with 4 $50 4'x12' sheets of
dynaglas greenhouse roofing running from the south edge of the cover (12,0)
to a point 8' from the north edge of the cover and 11.3' above it (8,11.3).
enclose the endwalls with flat polycarbonate.
5. collect about 1280 w of peak pv power and 10 kw of water heating with
a grid-tie inverter near the pv panels and a single high-temp hose to
the house with bidirectional flow and a fan-coil unit or radiant floor
and a 55 gallon drum with 300' of 1" pipe inside to act as a domestic
hot water heat exchanger, in series with a greywater heat exchange drum.
nick
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