NOTE --- UNDERSTAND --- the longer the panel that is exposed to the sun the hotter the air gets as it rises.
To explain: at the bottom of the panel the air will enter at room temperature and be lifted through the panel (hot air rises)... as the heated air rises, it is exponentially being heated the more it travels before exiting the panel. Additionally, the black Cinefoil is very thin which heats quickly. The black Cinefoil is THINNER than pop or beer cans... THAT is why these panels work so well.
Ohio Mike introduces this project by video.
This panel is only 3/4 of an inch thick and weighs in at less than a couple pounds. On a partly cloudy day the black foil collector reached about 150 degrees (during the sunny times). The film front only felt warm to the touch and the aluminum flashing on the back of the panel only made it to 98 degrees.
This type of solar panel (like most) only work if you have larger south facing windows or patio doors (which are better); and of course, a little sun helps. But the nice thing about these panels... They are VERY easy to make and hang "INSIDE" your window where you don't need to concern yourself with zoning codes or big ugly boxes hanging on the side on your house. A plus, you can take them down in the summer; also, because of their design... you can use these in apartments and condos.
The panel is without any electrical or mechanical parts and they work fine with its natural rising of heat through the back chamber of the panel. To aid the distribution of the heated air, add a small fan (on a low setting) to circulate the heat from the main room to other rooms in each doorway.
Yet another option... turn your thermostat's fan to on so the furnace fan runs all the time; this will allow for the best circulation throughout the house... put it back to auto at night.
The only hard to find part of this panel is the Cinefoil which can be bought from my website RedbarnCrafts.com
Let's get started...