I have recently built a solar dryer unit in an attempt to overcome the use of the electric Dryer. I mainly tried to make it very similar to the last one featured in Pauls 3 solar dehydrators. http://www.youtube.com/watch?v=oVTcnCuX2Qc
I made a short youtube that gives an overview of what it looks like. http://www.youtube.com/watch?v=j4az6TM1_HE
The solar panel is from an old solar hot water service. The issue is that the air is just not drawing through the chamber. The hot humid air stays up the top and doesn't draw through....
The chimmney is made of stainless steel painted black, but only gets hot where the the sun shines on it. The Solar panel seems to be doing a great job of putting hot air into the top of the chamber, not sure about the speed of the air movement. I Hid in it with a full set of wet nappies on a sunny day and couldn't feel the air drawing out into the chimmny like it did in the last of the 3 solar dehydrators videos. At this stage I am open to all suggestions. My idea is to put fans hooked up to a solar panel on the threshold of the chamber / chimmney that would suck the hot air down and out, hopefully creating the draw on the solar panel and getting some consistent air movement. Other ideas was to increase chimmney height and increase contact area through the chimmney.
Let me know what you guys think.