Posted by Dave McMahon on September 25, 2003, 7:42 pm
Sounds like a good idea small P.V or small tube on the bar where the
receiver would be. If these devices where linked in series might get a lot
Perhaps there are lots of old analogue Sat dishes now digital is popular
make the tube black and flat and the sun will heat the top of tube directly
and mirrors will heat the bottom?????
Posted by Joe Fischer on September 25, 2003, 8:12 pm
If high concentration is wanted, the mirror segments
probably would need to be aimed individually.
This would probably require some putty-like adhesive
that could be thick enough to aim the mirror segment, and then
allow to harden or set up.
And this should not be done in the sun, it would be very
bad for the eyes and skin, more than just a sunburn.
There is a way it can be done indoors with normal lighting,
a rod needs to be made to hang perfectly vertical, and a jig made
with a hole in it to sight through and placed at where the PV cell(s)
or heat exchanger will be.
Then while sighting through the hole, only the end of the
rod should be visible. If any side of the rodis visible, the
mirror is not aimed properly.
This should work even if the dish is not a perfect
paraboloid dish, in fact it may be possible to do this even
on a flat disk if small wedges are placed under the mirror
segments, making the mirrored look something like a
Fresnel lens (call it a Fresnel mirror if you will).
I made a few segmented dishes in the mid-1970's,
which would boil water, but PV wasn't as advanced as
it is now.
Posted by Peterthinking on September 25, 2003, 11:04 pm
I am going to use a laser pointer hanging on a string for mine.
hang over the mirror square(mine are strips aimed at a pipe)
and fiddle till it hits what I want it to hit.
neighbor just chucked a 5 by 2 mirror out...mine now!
I have around 30 square feet of mirror scavenged...time to start cutting.
E me if you want the drawing...too big to post.
Posted by Duane C. Johnson on September 25, 2003, 11:19 pm
A better laser method is to use one of the laser vertical
markers. They are very accurate and self contained.
I have one and it works well.
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Posted by Boner the Cat on September 26, 2003, 8:07 pm
really cheap mirrors in Wally World, box of several 1 foot square mirrors is
like $ 10.00
I cut these all the time with just a plain old glass cutter and a " T "