My recollection of typical transmission thorugh common soda-lime is way less--about 60 percent, assuming scrupulously clean glass on BOTH surfaces. Does anyone...
Elfpermacl@...
Aug 1, 1998 2:40 pm
797
... Dear Bev, That assumption isn't faulty. If the metal is heating up, it must be absorbing energy which it should be reflecting. I only can say that I...
Chris Keavney
ckl@...
Aug 1, 1998 9:54 pm
798
... The solar radiation transmittance data I've been using for passive solar building design is 86% for a clear, single-pane window (1/8" or 3mm thickness)....
Christopher Gronbeck
ceg@...
Aug 2, 1998 7:08 am
799
Thanks for the theoretical figure. This does not tell us, however, how much light gets through actual window glass in actual use as your solar cooker would...
Elfpermacl@...
Aug 2, 1998 3:46 pm
800
One more point to add regarding observations on reflectivity: The fact that a reflector doesn't heat up is not a good indication of it's reflectivity, but...
Wayne Hosking
wayneh@...
Aug 3, 1998 2:26 am
801
Hello all - this is the first time I've posted to this group. I've just joined and haven't seen any messages yet, so pardon me if this has been answered...
Mark C. Miller
sandy@...
Aug 3, 1998 9:04 am
802
Mark, The fresnal lens idea doesn't really work for solar cooking. You want to accumulate heat, not focus it. I'm guessing that there is some other problem...
Sorry, I should have explained my question more fully: I am aware of the 30/60 slant cookers. The situation, of course, is not as simplistic as I intimated,...
Wayne Hosking
wayneh@...
Aug 4, 1998 4:20 am
805
Here's how I made my really nice but nonfunctional box: I purchased two boxes specifically because they fit inside each other well. The inside box was 12x18x8,...
Sandy
sandy@...
Aug 4, 1998 6:17 am
806
... It should also be pointed out that absorptions and reflections do not necessarily add in a straightforward way. That 6% absorption is, I presume, an...
Chris Keavney
ckl@...
Aug 4, 1998 11:44 am
807
Re: fresnel: a) a very good question b) I agree with Tom. To my knowledge the fresnel solar cooker has been around at least since 1962 Volunteers In Technical...
Dar Curtis
darcurtis@...
Aug 4, 1998 11:38 pm
808
Here in Mexico (at about 19 degrees latitude) we've found that our cooker seems to get hotter in the winter with sun angle of about 40 degrees than in summer...
Eric Johnson
ejohnson@...
Aug 4, 1998 7:29 pm
809
I've played around lately with a 16" dia. fresnel lens - quite impressive but not too practical. The problem is too much heat in too small a spot. Anybody know...
Eric Johnson
ejohnson@...
Aug 5, 1998 5:59 pm
810
... You're right about your statement. I have a similar cooker, but a dont mind de 30-60 angle. I can tilt de main reflector what means that I can start...
romulus remus
CMONTERO@...
Aug 5, 1998 6:48 pm
811
Eric, In response to your question about linear fresnel lenses and collectors, there was a commercially prototyped (if not actually produced) linear collector...
Vint Lawrence
vlawrence@...
Aug 5, 1998 9:38 pm
812
I havnt tried this, but you may have success stretching out a length of clear plastic between two poles to form a stretcher, and then filling it with water to...
Richard McMahon
mcmahonr@...
Aug 6, 1998 11:07 am
813
Have you tried Edmund Scientific for fresnel lenses? For Mother Earth, Dan Hemenway, Yankee Permaculture Publications (since 1982), Elfin Permaculture...
Elfpermacl@...
Aug 6, 1998 5:07 pm
814
Dear Sandy, It sounds like you've done most everything right. I can only offer a few suggestions about your lack of success with the solar box. 1. You don't...
Chris Keavney
ckl@...
Aug 7, 1998 11:37 am
815
Hi, all! I feel like a fraud lurking on the list when I haven't even finished my first attempt at a box cooker yet, so I figured I might as well at least ...
Sherry Hintze
chhintze@...
Aug 7, 1998 2:58 pm
816
As I sent the previous post, I realized I had forgotten to include a question about another kind of box cooker. What I am thinking of is a slow-cooker, where a...
Sherry Hintze
chhintze@...
Aug 7, 1998 4:18 pm
817
That, to my knowledge, is called a 'fireless cooker'. The idea is to conserve energy by heating food only once, and then letting residual heat continue the...
Angela
chotii@...
Aug 7, 1998 8:49 pm
818
Hi Sherry, Welcome to the solar cooking list. That's great you're starting with solar cooking. 'Sounds like you'll be cooking quite a bit there in NC. You...
Mark Aalfs
aalfs@...
Aug 7, 1998 9:56 pm
819
That is what is called a strawbox cooker, presumably because it was first used by placing a hot pot into a box filled with straw as insulation. It is ...
Elfpermacl@...
Aug 8, 1998 3:41 pm
820
The 'haybox' or 'strawbox cooker' or 'autocuiseur' was quite common in Europe until maybe 2nd world war. I've been told by someone that his mother used to...
Michael Götz
cuisinesolaire@...
Aug 13, 1998 7:54 am
821
Hello all My name is Victor Jimenez. I have been interested in solar ovens for a few years. My first try was just a cardboard box lined with foil and a potato...
Tom Sponheim
tomsp@...
Aug 13, 1998 8:50 pm
822
... Victor, we are just in the beginning stages of learning how to build a (very) efficient, cheap, portable solar cooker. I needs to be built out of readily...
Dave Jones
dfj@...
Aug 14, 1998 1:52 am
823
Does anyone know of a List for water collection and distillation? Thanks, Dave Jones...
Dave Jones
dfj@...
Aug 14, 1998 2:00 am
824
Dave, For information on solar water distillation, contact Agua Del Sol at 520-485-9211 or http://www.zekes.com/~aguadelsol. Will Hartzell Safe Water Systems...
Will Hartzell
will@...
Aug 14, 1998 4:18 am
825
... Thanks Will. I am really looking for information regarding the building of these types of units. Dave Jones...
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