My old man is planning to make a solar panel, after seeing this project:
http://24volt.eu/solfangare.php
Every winter he needs to heat up his workshop to avoid water pipes freezing, and occasionally make it warm enough to work in. Hopefully that can be avoided by placing a solar panel on the wall.
The plan is to replace a door which is anyway almost never use, with a glass and a dark background. Air holes above and below should provide enough natural air flow so that no fan is needed. Another difference, with respect to the link above, is that the air is not taken from outside. The idea is that this will increase the efficiency even more when it's cold outside. You can see an initial drawing below.
I'll keep you updated about the progress!
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