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temp glazing and cheap solar collector - Page 3

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Posted by Jeff on November 20, 2006, 3:24 pm
 
SJC wrote:


   I feel pretty dumb at times.

   I never thought insulating the walls would be practical because all I
had heard of was the spray in foam which is beyond my means.

No doubt blown in cellulose has been around for a while for existing
walls, but it came as a complete surprise to me. I would have done this
years ago, if I had realized.

   I wonder what else I'm missing!

   Cheers,
Jeff


Posted by SJC on November 20, 2006, 3:52 pm
 
I think there may be lots of folks that don't know how easy it can be.
Local utilities say they will come out and do an energy audit and let you know
how you can save.
I don't think many people have these audits done, let alone put in the
insulation.
In the U.S. we talk, but often don't walk when it comes to saving energy.



Posted by Tater on November 22, 2006, 12:22 am
 
Jeff wrote:

DON'T DO IT!!!!!

:)

actually, before you jump into this project, I'd suggest you start with
one of those single window thermosyphons first.

but gary is right, try it. or try something else that might look
better. too many people i know have not bothered to try, and have
regretted it.

and yes, my current thermosyphon project still bites. I am in the
middle of a sunf-tuf desert it appears :) But I am NOT giving up!


Posted by Jeff on November 22, 2006, 7:11 am
 Tater wrote:

   Well, I was wondering how that was coming along. Your problems have
made me wonder about using polyethelene in a temp collector, certainly a
thermosyphon. Thermosyphon collectors require the absorber to get hot
enough to generate an airflow. If much of your heat is being reradiated
back out through the IR transparent PE glazing it may never start
thermosyphoning. I think what you want to do is scrub the heat off the
absorber before it can be reradiated, and for that you'll need a fan.
Note that Gary's "Greenhouse style" is not a thermosyphon.

   Just my 2 cents.

   Jeff


  I am in the


Posted by Morris Dovey on November 22, 2006, 12:00 pm
 Jeff (in aKS8h.1950$s6.421@newsread2.news.pas.earthlink.net) said:

| Tater wrote:
|| Jeff wrote:
||
|||   Suggestions welcome (Nick, Gary, et all). Especially to tell me
|||  this idea is foolish and not to do it!
||
|| DON'T DO IT!!!!!
||
|| :)
||
|| actually, before you jump into this project, I'd suggest you start
|| with one of those single window thermosyphons first.

Starting as simple as possible is almost always a good idea.

|| but gary is right, try it. or try something else that might look
|| better. too many people i know have not bothered to try, and have
|| regretted it.

True - and we've all missed out if even one of them has had a really
good idea that was abandoned without a test...

|| and yes, my current thermosyphon project still bites.
|
|    Well, I was wondering how that was coming along. Your problems
| have made me wonder about using polyethelene in a temp collector,
| certainly a thermosyphon. Thermosyphon collectors require the
| absorber to get hot enough to generate an airflow. If much of your
| heat is being reradiated back out through the IR transparent PE
| glazing it may never start thermosyphoning. I think what you want
| to do is scrub the heat off the absorber before it can be
| reradiated, and for that you'll need a fan. Note that Gary's
| "Greenhouse style" is not a thermosyphon.

Even a small vertical temperature differential will produce an
airflow. I've built thermosiphons with /really/ poor glazing that
actually produced useful amounts of heat. Could the problem be air
leakage (cold outside air leaking in, warm air leaking out, or both)?

If a thermosiphon collector completely fails to thermosiphon, I'd be
inclined to look for a leakage problem - perhaps a problem with the
method used to seal the glazing...

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto



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