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  
Scott Davis

Avatar / Picture

Moderator
Registered:
Posts: 701
Reply with quote  #1 

Following the good success I had with my solar projects up to this point, I decided to get serious and build big - a 24' X 8' pex / aluminum serpentine collector at the tree line of our back yard!

I understand soldering is easy to learn, but I've never done it myself, so I decided to use pex tubing instead.  It connects with push on sharkbite fittings which makes it very easy for a DIY challenged guy like me as no soldering is required at all!

This design works but my CPVC design is working even better.  The CPVC design has much lower flow resistance too.



Here is my website detailing the project:

http://www.n3fjp.com/solar/BigProject/BigProject.htm

And here is a video summary:




Have you built a pex solar collector? Please reply and tell us about it here! Please be sure to include pictures if you can!

Do you have questions about the pex solar collector? Please reply, this is the place to ask about it! We will do our best to help!


__________________
Take care, Scott MD

cwwilson721

Registered:
Posts: 303
Reply with quote  #2 
A few questions:
  • How much pex is in the collector itself? (Not including the underground portion). I know you listed 300' total, but how much in just the collector (rough guesstimate)?
  • Did you ever run the 'extra' PEX thru the collector? If so, what did you notice?
  • It may have been in the original post, but what pump/flow rate are you running?
Scott Davis

Avatar / Picture

Moderator
Registered:
Posts: 701
Reply with quote  #3 
Hi,

I have about 300' in the collector itself.  I haven't run additional pex through it.  My flow rate is only a gallon a minute, due to my nearly 700' round trip at only 1/2".  I definitely should have used a larger diameter out and back.

__________________
Take care, Scott MD
Randall Cothren

Registered:
Posts: 1
Reply with quote  #4 
Hi Scott, I watched the video and thank you so much for helping me know there is a PEX method. I was wondering what size pex 1/2? I was also wondering if the pump was a 12 volt PV pump or are they too weak to do the job.  
stmbtwle

Avatar / Picture

Registered:
Posts: 2,952
Reply with quote  #5 
Scott you gave me a thought comparing pex with cpvc. Suppose instead of one long "serpent" you had several shorter ones in parallel? You'd have better flow, and keep most of the ease of construction.
__________________
Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Scott Davis

Avatar / Picture

Moderator
Registered:
Posts: 701
Reply with quote  #6 
Hi Randall,

I used 1/2 inch pex.

Willie, I considered that and I think it would be more efficient too, but the Ts for the pex make it a more expensive approach than CPVC.

__________________
Take care, Scott MD
stmbtwle

Avatar / Picture

Registered:
Posts: 2,952
Reply with quote  #7 
Yeah those Sharkbites are pricey! But depending on the number of serpents you wouldn't need many.
__________________
Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Cathy in Georgia

Registered:
Posts: 3
Reply with quote  #8 
Currently I have no furnace and no ductwork, all removed due to asbestos.  I've done several hot air collectors over the last 10 years.  With no ductwork under the house, (and no heat in the house) this is the time to consider a hydronic radiant heat system.  I'm in north central Georgia. It is a one story ranch with about 1200 square feet that need to be heated. Can I do it with solar heated hot water, pex under the floor, and most likely a hot water heater as backup?  I don't want to install the radiant heat only to find I need the furnace after all.

Cathy (central Georgia) 
ChrisJ

Registered:
Posts: 101
Reply with quote  #9 
You would have to build a huge collector and have a large water storage tank(500 gal or so). 

The pex under the floor is the least efficient method, heat has to get through the subfloor and whatever flooring you have.

Look into ductless minisplits you could heat and cool.

__________________
Rhode Island
Previous Topic | Next Topic
Print
Reply

Quick Navigation:

Easily create a Forum Website with Website Toolbox.

 

web statistics