I am going to make a similar, but more romantic thermoelectric generator, using a few candles instead of wood. Light the candles, wait for it to heat up a little, start Pi, Watch movie with girl
My design calls for 2 peltiers, 2 discarded heatpipe CPU coolers and cheep DC/DC circuit(s) from battery powered emergency mobile phone chargers, heat-spreader block on the hot side off the peltiers, and aluminium profile processor coolers to capture the energy from the flames.
The goal is to make it passive cooled, so no fans.
To accomplish this i will mount the heatpipe coolers in a V shape so convection will take care of the air flow. The reason for not putting the heatpipes horizontally is that they will want to be assisted by gravity to return the working medium to the heat source.
The tricky bit will be making the custom triangular heat spreader. I am thinking of casting that peace out of Silver scrap that my brother keeps buying cheep at auctions
The result will be more art than science, but that is okay .
I have all the bits and peaces i need, now i just have to putt it all together.
Might take me a while to get up and actually do it...