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A brain teaser question about solar energy ? - Page 4

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Posted by Mike on July 7, 2006, 3:21 am
Didn't know copper pipe was so expensive in US, 5m lengths of  hard extruded
15mm or 1/2" thin wall 0,7mm thick costs NZ$6 at wholesale rates and the
3/4" 1.2mm wall costs about $5, copper foil 300mm width by 0.25mm thick
costs approx $8 per Kg. So a 8' X 2' panel would cost approx (4 risers $2,
headers $2, foil fins $0, solder $5, glazing $6, wood case $0, gas for
brazing and soldering $0, 25mm polyurethane foam $5, fibre glass faced
foil $0, aluminium angles or galv angles to hold glazing on $5) total $45
not including your time. One of these would be required for each person in
house + additional one for every appliance i.e. dishwasher, washing machine
= 2 more. You may require 6 as a minimum with a 4 person household $470.
Considering they will last 20 years and save approx $00 per year, I would
say its good value

Roll form sheets here have a peelable protective plastic coating that covers
the UV side, has tiny writing on it "UV This side up" about 3mm tall down
one edge, you would miss it if you didn't know it was there.

Well if I blow it up then darn, no more cold beer in the summer. I made a
big reflector (8' x 3') few weeks ago out of shiny building paper foil
clamped between 2 sheets of thin polycarbonate and mounted above one of the
test solar panels, to reflect extra sunlight onto the panel, seeing as its
winter here, the sun isn't very strong. Works fine, has boosted the
available hot water over 15% into the test HWC. Now if a similar arrangement
was used and curved to form a parabola to focus the sunlight onto a strip of
copper with a number of these pelter devices bolted to it then it may
produce some usable power. Will try it with one first...


Posted by Jeff on July 6, 2006, 2:09 pm
FukUSpamer@fukspamer.com wrote:

Solar hot water could be a big plus for them, at 100 degrees, you are
most of the way there already!

But, lets forget solar for a while. I have Amish friends and I can tell
you about a few things that are a big help to them.

1) LED flashlights. Usually they use the 1 AAA cell, but I have seen
them (proudly) with the $0 windup 3 LED lights. I'd take them both.

2) Sharp saws and good hand tools. Although most Amish I know have gas
and diesel machines, some things must be done by hand.

3) Do they have kerosene? The Chinese are selling kerosene lamps dirt
cheap. Amish kids love the small kid size lamps I can get for $ US.

4) Plastic sheets and containers, seems to get used everywhere.

Do they have any wind at all? It would seem to me that there should at
least be morning and evening breezes, go wind power.

If they have farm animals you can compost the waste and generate a gas
that can run a generator.

On another note, why not take them a few wind up radios?

   Perhaps you have already done most of that...


  Water is available, sun is avaialble year

Posted by Jack on December 11, 2006, 12:37 am

I trust that means you don't want to spend much money but want to get some

do they need electricity? If they have no electricity, then they have no
electrical infrastructure? have you considered the cost of electrical
utilization? Can they afford a light bulb? What problem are you specifically
trying to solve with the use of electricity? This is not a cynical question
only looking for perceptions and expectations.

What is the temperature at night time? Or better still where is this village

Why not? Is it related to money?

 food supply, what do they eat? Is there cattle farming? Renewable plants?

What do they use for fuel for cooknig?

---Take the average shack, mud hut or tee-pee and insulate it with the best
local materials. (camel fur?) then use evaporative cooling to help cool the

----Also, get some tinfoil and cover every house with it.

----utilize night time natural ventilation to cool the houses.

-----A well insulated house with reflective and insulative properties might
just do a bit better for heat gain.

The thermodymic cyle that is used to drive a turbine is not much more
efficient than 28% or about the same as the best PV panels.

You sould forget about this option as a charitable solution.

Control the heat gain and you will solve the cooling issues. Maybe  a well
insulated sub terranian dwelling with a pool of water on the roof to
moderate heat gain and provide evaporative cooling to the living space?

How do animals cope? Is there something to learn?

If you expect a miracle, YOU should not limit yourself to 3 ingredients.

Cheers y'all


Posted by Morris Dovey on December 11, 2006, 1:15 am
 [ missed original post - reconstructed from response]

|| Here is a small puzzle for you genius ppls:
|| Throw your best shot......
|| Our company is involved in a charity work in a thrid world country.
|| Its a small village with no electricity.
|| Water is available, sun is avaialble year round, no rain,
|| temperature hitting around 100 -120 F every day.
|| Restrictions:
|| We don't want to use solar panels
|| Local Resources:
|| Which in this case is Sun, water and extreamly high atmosphere
|| temperature on the ground
|| Goals:
|| How to use sun light, high temperature, and water to make the life
|| a lil confortable for local population ?
|| Possibilities:
|| 1. Use sun light to heat water that can run tubine to generate
|| electricity ?
|| 2. How about using heated water to cool the home ? like passing
|| the steam in an expansion valve (just an idea) Don't laugh ......
|| lol. I am not a expert.
|| 3. Any other idea ? Remember basic ingrediant are 3 as listed
|| above.

Follow the link below. It might provide you with a few ideas.

Morris Dovey
DeSoto Solar
DeSoto, Iowa USA

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