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 2 of 3      Prev   1   2   3   Next
gbwillson

Avatar / Picture

Registered:
Posts: 2,065
Reply with quote  #11 
I think 4" diameter tubing inside a collector is usually too big, as the main flow if air can too far away from the heated surface. But if you do want to use that size tubing, consider aluminum flex tubing. It's cheap, easy to work with and the ribs on the sides might have an advantage breaking up the laminar flow within the duct. Many collectors have used the flex tubing and seem to be happy with the results. From what I've seen, the tubing is snaked back and forth in a single path within the collector. This allows the air plenty of time to warm up before it exits. Just make sure the exit air isn't too hot as you end up wasting heat out through the glazing.

Greg in MN

KevinH

Registered:
Posts: 534
Reply with quote  #12 
I used the 3" aluminum flex in my last collectors.  Used it end to end like the downspout collectors.
http://simplysolar.supporttopics.com/post/kevin-h-tube-collectors-7130284?highlight=tube+collector&trail=10
It works well but I probably wouldn't do it again.  Difficult to expand the tube to the full length and on a few I had to seal a hole from stretching it too far.  It was also hard to spray paint evenly with all of the ridges/valleys.

Years ago I tried to roll aluminum screen into tubes.  Very difficult to do.  Fiberglass would roll easier but may collapse in the heat.  Some discussion on the idea here:
http://simplysolar.supporttopics.com/post/screen-tubes-7751325?highlight=screen+tube&pid=1289497496

Kevin H
MN
klecroy

Registered:
Posts: 16
Reply with quote  #13 
Willie,i was thinking the stovepipe because you can get 90 degree bends, and build it long like Scott did along the bottom of his house maby 2 runs about 20 feet,then 90 degree and back,however i can build ant size as i have pleanty of room.Or at the turn,should i make the box turn ? Thanks



stmbtwle

Avatar / Picture

Registered:
Posts: 2,474
Reply with quote  #14 
Sorry I was just thinking that stovepipe would be hard to work with. Others will have to advise on it's effectiveness. I'd probably go with a screen collector.

__________________
Willie, Tampa Bay
klecroy

Registered:
Posts: 16
Reply with quote  #15 
Only thing was the 180 degree turns,but if the downspouts ar on their side i could get it to wofk,or use the open box type at end thanks
gbwillson

Avatar / Picture

Registered:
Posts: 2,065
Reply with quote  #16 
Take a look at Jakes collectors. Both of them are ZeroPass screen collectors, and they both have the airflow weaving back and forth.
http://simplysolar.supporttopics.com/post/jakes-solar-north-of-50-9446061?trail=20#7


While you could use downspout elbows for the turn, I think they would be too restrictive and perhaps too wide a turn. If you do go with the open box end you'll want to use some flashing to round off the corners. Also make sure the turn around isn't too small. 

Greg in MN

klecroy

Registered:
Posts: 16
Reply with quote  #17 
For glazing can i  use corragated sheets like goes on metal bildings for skylites ?
SolarInterested

Avatar / Picture

Spam Stomper
Registered:
Posts: 995
Reply with quote  #18 
There info on Solar Collector Glazing Materials below

http://www.builditsolar.com/Projects/SpaceHeating/Glazing.htm

__________________
Both temperature rise and airflow are integral to comparing hot air collectors
gbwillson

Avatar / Picture

Registered:
Posts: 2,065
Reply with quote  #19 
Personally, I don't like the corrugated sheets. They are much harder to work with to get a tight seal than a flat sheet. And if you use them horizontally, they collect snow, duct and dust. Twinwall polycarbonate sheets have a clean look and are easy to work with. Where do you live? Do you have a Menard's hardware store in your area? 4x8 sheets of twinwall are often on sale for as low a $30 per sheet. If not, check with any local garden centers and greenhouses to see if they can order a couple of sheets. Stay local if at all possible, as shipping large sheets is VERY costly.

Greg in MN
stmbtwle

Avatar / Picture

Registered:
Posts: 2,474
Reply with quote  #20 
Re shipping: Greenhouse Megastore has "easy ship" 2'-wide twinwall panels (up to 8' long) that can ship standard ground, if you can't find it locally.
http://www.greenhousemegastore.com/product/easy-ship-2-ft-wide-twinwall-polycarbonate/plastic-sheets

__________________
Willie, Tampa Bay
Previous Topic | Next Topic
Print
Reply

Quick Navigation:

Easily create a Forum Website with Website Toolbox.

 

web statistics