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
Sign up Calendar Latest Topics
 
 
 


Reply
  Author   Comment   Page 5 of 41     «   Prev   2   3   4   5   6   7   8   Next   »
AntonioDB

Registered:
Posts: 16
Reply with quote  #41 
I will put a CMV with energy recovering. The best ones will have a real efficiency of about 80% so a bigger collector can compensate the energy lost by the CMV.
If the collector will however be over what I need for my home, I can think to warm also the apartment under mine (that is of my sister and she doesn't warm it during the winter), or to put inside some pipes and transform it in an hybrid one (air and water)

Scott Davis

Avatar / Picture

Super Moderator
Registered:
Posts: 697
Reply with quote  #42 
Hi Guys,

Bob Allen built a 8' X 8' hot air collector, which essentially flows up to the top and then back down.  At first he wasn't getting as much heat as he expected.  Then, using a temperature sensor, discovered a good percentage of the heat was trapped at the top of the collector.  He switched to a larger blower that could overcome the natural convection, pull the nice hot air back down and into his basement and now the panel works very well.

__________________
Take care, Scott MD
Dutch

Registered:
Posts: 3
Reply with quote  #43 
If I built a long, low-profile collector like the Scott Davis Youtube downspout collector, only use double black screen, what are the drawbacks?  Seems that the heat output would be at least the same, but would airflow be messed up somehow?  The big 4X8 collector isn't really an option for me.  I'll be building a low-pro with either downspout or double screen, but screen seems like a cheaper/easier option.  Thoughts?
solardan1959

Avatar / Picture

Registered:
Posts: 1,845
Reply with quote  #44 
take your pick,







Second two are a little rough looking because they are experimental and just testing them now but they work great both horizontally and vertically but need fans for the first configuration.  The last bigger white one I am also testing with a water grid in it and it's working ok also.



They work great, I prefer the solar screen model, (above), as it seems to generate the most heat but I have not compared it yet in the 4X8 configuration, coming soon.
Dan


Scott Davis

Avatar / Picture

Super Moderator
Registered:
Posts: 697
Reply with quote  #45 
Hi Dutch,

As far as I know, Dan is the first to begin experimenting with screen in a long, low, horizontal design, but given his good results and our excellent results with screen overall, I think screen would be a great choice in a long low horizontal collector too. 

__________________
Take care, Scott MD
RayBright

Registered:
Posts: 5
Reply with quote  #46 
Scott:

Love the video. Where did you get the temperature monitors? What brand are they. Search without brand brings up far too many to guess their appropriateness. 

Planning science projects for kid's school.

Ray
Scott Davis

Avatar / Picture

Super Moderator
Registered:
Posts: 697
Reply with quote  #47 
Hi Ray,

I've used a variety of wired temperature sensors with good success.  I usually just get whatever happens to be cheapest.  I've found them as low as $2 each on eBay at times, thought more often than not I'll pay in the $6 - $9 range.  If you Google wired temperature sensors, you'll find lots of options.

By the way, I use wired for three reasons - (1) I usually need to extend the range and it is easy to splice in speaker wire with wired sensors and (2), I don't want to have to worry about changing a remote batter or (3) signal interference from multiple sensors.

Whatever you get, just compare then to a sensor of known accuracy, just to make sure.  They are all usually within one degree.

__________________
Take care, Scott MD
joebehr

Registered:
Posts: 109
Reply with quote  #48 
Question...will black fiberglass solar screen work as well as black aluminum screen in a screen-type solar air heater as a collector?
solardan1959

Avatar / Picture

Registered:
Posts: 1,845
Reply with quote  #49 
joebehr,
   The general consensus is performance wise they are the same.  I prefer fiberglass because it is cheaper and so much easier to use when it comes to handling, cutting, stretching, etc.  There was a possible complaint a while ago where Gary from build it solar talked about smell but was unsure if it was a by product of the paint he used on the fiberglass screen.  I have used it on several collectors with good results and it has held up several tears.
   On saying that,  aluminum screen is more expensive but may hold up longer and better in a severe stagnation event over fiberglass.  I have not ever seen anybody ever complain about this and think the fiberglass would do fine.  It just stands to reason the metal screen will last longer and hold up better to UV rays. (again I have never heard of any issues with fiberglass screen though)
Dan
Scott Davis

Avatar / Picture

Super Moderator
Registered:
Posts: 697
Reply with quote  #50 
I agree with Dan.  By the way, if you put the screen under UV protective glazing such as Suntuff, you won't have to worry about sun degradation.  The performance was too close to call in my limited testing, but if anything, it appeared the fiberglass may have performed very, very slightly better.  I suspect because the hole spacing was closer together.  Again, within the margin of error, for all intents and purposes, fiberglass screen and aluminum screen work equally well, and are among the best choices we've tried.
__________________
Take care, Scott MD
Previous Topic | Next Topic
Print
Reply

Quick Navigation:

Easily create a Forum Website with Website Toolbox.

 

web statistics