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 4 of 4      Prev   1   2   3   4
gbwillson

Avatar / Picture

Registered:
Posts: 2,233
Reply with quote  #31 
Are the collectors on the left and right both going into the same room?


KevinH

Registered:
Posts: 554
Reply with quote  #32 
Yes, they go into the kitchen.  Originally I wanted to have one large collector (maybe 8' wide x 10' tall with the same U air flow) instead of two, but didn't come up with a way to fit it in that area.

Kevin H
MN

stmbtwle

Avatar / Picture

Registered:
Posts: 2,731
Reply with quote  #33 
Was looking at your 3 speed fan controller and found one with a temperature sensor:

http://www.ebay.com/itm/Smart-Fan-Speed-Controller-II-With-Temperature-Sensor/140466633098?

There appear to be quite a few others.

__________________
Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
griz-525

Registered:
Posts: 18
Reply with quote  #34 
Been awhile since I posted. You folks are certainly dedicated, to this.  I saw a post talking about fans, push? or Pull, I wanted to comment on that.  As cooler air is denser, it is more effective to push the cold side.  I am using a salvaged computer fan, powered by a so;ar panel, no sun, limited heat exchange so the need for a fan minimal, sun and fan no need for fancy thermal couples.  Seems to do the trick, if I can keep the snow from covering up everything[smile][smile]
dbc

Registered:
Posts: 218
Reply with quote  #35 
Kevin,  I just re-read this whole thread; I am considering a tube build down the road.  I have a question about the black paint inside the collector - You stated you wanted to avoid any paint in the airflow path, which you have done.  Since the airflow path is sealed, I assume there is minimal or no air circulation around the outside of the tubes and the interior of the collector enclosure.  Have you found that these areas are vulnerable to overheating?  Any weird smells?

When my 2x16 ZP stagnated last year, I could smell it out in the yard, 10-15 feet away.  As a friend of mine put it, 'If you can smell it, you're breathing it'.  I have had a couple paint problems, mainly of my own making, with screen collectors.  Fortunately I haven't had any problems since I undertook some 'outgas mitigation' measures, and I have been very careful to avoid any stagnation events since.  Still, I'm not certain it couldn't happen again.  Health is nothing to fool with.  Thanks, Don C. 
KevinH

Registered:
Posts: 554
Reply with quote  #36 
No, I haven't had any problems with smells/odors indoors or outdoors.  This is the 3rd season.  A couple times they stagnated for a short time (one time the power supply didn't turn on and another time I forgot to turn it on).  There was a "hot" smell that quickly went away.  Hard to say where it came from.  Home furnaces do that from the dust when first started in the Fall.  I'd like to incorporate some sort of stagnation protection if I ever rebuild these.  Maybe something that trickle charges a battery (like a solar light) that powers a small motor to open a door at a high temp.

I have never measured the air temp inside the collector in the area outside the tubes.  The key is to have enough air flow through the tubes (applies to all collectors).  I could use a bit more CFM, especially when it starts getting warmer outside, but that will have to wait for a future build.  There have been discussions about letting some air flow outside the tubes.  Cooling the air inside the collector box means the tubes will also be a little cooler, so it may not have much impact.  And if you are willing to have the air flow over painted surfaces, a screen collector is easier to build.

In the plenums I covered all of the polyiso with heavy duty kitchen aluminum foil and everything is sealed with 100% silicone.  May not be necessary, but in my case I was recycling some polyiso so there were more joints than normal.  The flex tubes were checked for small holes by shining a bright light into them after they were installed.  I did the paint burn in just to make sure that any outgassing didn't cloud the twinwall once it was sealed.

Kevin H
MN
dbc

Registered:
Posts: 218
Reply with quote  #37 
Kevin,  Thank you for the additional information.  Agree - the first, best thing is to ensure adequate air flow, so you're removing heat from the collector.  The tubes aren't thermally isolated from the rest of the interior, it's just the airflow that's isolated.  Since the tubes are being cooled by the airflow, they should absorb heat from the surrounding area as well as from direct radiation, helping to regulate temperature in the enclosure.
Previous Topic | Next Topic
Print
Reply

Quick Navigation:

Easily create a Forum Website with Website Toolbox.

 

web statistics