Welcome to the Solar Collector
Brainstorming and Development Page!


 

Home

Hot Air Collector

Hot Water Project 1

Hot Water & Space Heating

Solar Electric

Solar Construction 101

FAQs

Best Collectors

Simply Solar
Register Calendar Latest Topics
 
 
 


Reply
  Author   Comment   Page 6 of 8     «   Prev   3   4   5   6   7   8   Next
Onoff

Registered:
Posts: 38
Reply with quote  #51 
I achieved thermosyphoning i.e no pump when I first made it. I got 82degC at the outlet of the panel which gave mid 40s degC in the UNINSULATED tank.

I just never did anything further with it!

Attached Images
jpeg 2017-04-30_03-44-46.jpg (109.81 KB, 24 views)

Onoff

Registered:
Posts: 38
Reply with quote  #52 
My son built a concept solar tracker (below) for his GCSE project a couple of years ago. It was his first attempt. Needed slip rings really to tidy the wiring up and the panel brackets raised to increase the available panel elevation but it would happily track the Sun!

(Just finished his A Level project that's a "crane" with a colour sensing camera on the hook to pick out only certain colour loads).

Attached Images
jpeg 20170430_155135.jpg (112.07 KB, 24 views)

stmbtwle

Avatar / Picture

Registered:
Posts: 2,731
Reply with quote  #53 
I remember that pic (what is that a beer keg?) But it didn't show the collector so I didn't make the connection.

Kudos to your son, that's a nice tracker. Mine was cobbled together out of plywood. The entire drive mechanism was mounted on the moving part and was powered directly by the pv panel. In the morning when it powered up it would automatically track back to the east, even if the sun was behind the PV panel. Two slip rings (actually flat circles) carried power to the battery so that I could drive the boat in circles and it wouldn't get tangled up. For a land-based tracker I'm not sure they're needed.

__________________
Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Onoff

Registered:
Posts: 38
Reply with quote  #54 
Quote:
Originally Posted by stmbtwle
I remember that pic (what is that a beer keg?) But it didn't show the collector so I didn't make the connection.



Yes a small home brewing keg. I'd love to know what it would have achieved insulated!
Onoff

Registered:
Posts: 38
Reply with quote  #55 
Removing the protective wire mesh over the glass makes it more productive I've noticed. Also surprising the ammount of condensation build up inside the glass. I think I should pack insulation around the 22mm horizontal pipe sections top and bottom next time too. Wondering if these in fact act as a radiator even though they're painted black.

I've just measured my glass stock from the old greenhouse and 610 x 458mm seems to be the size to conjure with!

Attached Images
jpeg 20170430_160801.jpg (246.06 KB, 22 views)
jpeg 20170430_160730.jpg (233.13 KB, 24 views)

stmbtwle

Avatar / Picture

Registered:
Posts: 2,731
Reply with quote  #56 
Nice. Removing the screen makes it a lot easier to see too. The loss from the screen would be expected, but if you're using window glass I guess it's a necessary compromise.

I wonder if it would be worth the effort to extend the can stack to also cover the manifolds?

__________________
Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Onoff

Registered:
Posts: 38
Reply with quote  #57 
This evening's mad musing....TUNA cans! [smile]

I got to thinking as to whether they could be re-purposed as shallow collectors, almost by virtue of their shape they might work as "concentrators"?

For the pics I drilled thru with a hole saw marked 16mm / 5/8"  expecting our 16mm Pex-Al-Pex to slide through. I guess though as it's a genuine L S Starrett it's actually true 5/8" diameter so 15.875mm and the Pex wouldn't fit! Hence a bit of our 15mm copper tube in it's place. I'd used then an 11/16" (17.4625mm) for Pex. A European brand marked 16mm might indeed be that. The reason for the Pex was to avoid the copper to ali reaction where it passes through the tin.

Anyway...I wonder if a load of these tins abutting each other and sat on a sheet of poly iso in a frame merits consideration (this for hot water btw)? Where the 4 tins meet would obviously be a rough diamond shape hollow the depth of the tin. This could be filled with a weak sand/cement mix, painted black to act as a heat store? Or indeed just fill with the weak mix?

Make one I suppose is the only test!

33523234664_549c990e6c_z.jpg 

34323824646_4f065f766c_z.jpg 


stmbtwle

Avatar / Picture

Registered:
Posts: 2,731
Reply with quote  #58 
I have no idea how well it would work.

Wouldn't it be easier to simply set the pex in the cement and take the tuna tins to the recycler?

Living in the tropics I've always wondered why one couldn't do that while laying a driveway or parking lot. My driveway gets too hot to walk on, and it's only April! [frown]

__________________
Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Onoff

Registered:
Posts: 38
Reply with quote  #59 
[smile]

The idea was to cut down on the overall weight of an all concrete collector and get the best of both worlds. A metal collector - the tin section for fast warming the copper / Pex when the sun is shining when it will also be warming up the concrete. When the sun goes in there's still a little heat in the concrete.....maybe.

Driveways.....It is already being done:

http://www.icax.co.uk/asphalt_solar_collector.html
Rick H Parker

Avatar / Picture

Registered:
Posts: 742
Reply with quote  #60 

"The idea was to cut down on the overall weight of an all concrete collector and get the best of both worlds."


An all concrete collector may very well allow you to do both worlds. Solar Heating in the winter and Radiant Night Sky Cooling in the summer. The process in which Solar radiation is converted to thermal energy is reversible.  The conversion efficiency is not symmetrical, Thermal to Radiant tends to be the lesser of the two.  Considering the problem the world faces, sending excess energy out into space make a whole lot of sense.

__________________
Rick H Parker
Kansas, USA
Electronics Engineering Technologist
Previous Topic | Next Topic
Print
Reply

Quick Navigation:

Easily create a Forum Website with Website Toolbox.

 

web statistics