Satamax Antone wrote:It's been discussed many times over here. So far nobody came back to brag, or with amazing results.
Problem with TECs Pelletier thingys, is that they don't produce much. And that they have a temperature limit which is rather low. And to produce electricity with theses, you need the bigger temp differential you can get. Not 80C° hopt face and 20C° cold face.
John Weiland wrote:@Steven Oh: "I've played with this tech for the last 15 years or so, and TBH, have been mostly disappointed. It's such an attractive technology, but it still needs a lot more development to be truly useful to most of us."
Steven, could you perhaps elaborate on a different approach. My thermodynamics and knowledge of thermocoupling is terrible, so please bear with me.
In many climates closer to the poles, one will generally heat the home to about 55 degrees F (~13C) minimum. During the coldest months, the days are short and the sun is weak, thus solar vastly reduced from the summer months. Yet on the northern wall of an average home (obviously not an earth-bermed dwelling), it could be a fairly average 0-10 degrees F (-18 to 12C) on the outside of the wall, given the severity of the season and how close the poles one is. Granted, as you alluded to, there is huge room for improvement and cost of the technology, might it not be useful to (Finally!) have a polar-directed wall that could be "of use".....could in fact be one massive 30 ft X 8 ft thermoelectric generator utilizing the inside-outside of the house as the thermal differential, even if only for trickle charging as a complement to PV for battery maintenance? Even if this temperature gradient is pretty paltry, might it not suffice given efficiency improvements in the technology and a large enough surface area? It would be serving the opposite role as the equatorial facing wall, which is windowed to gain as much passive solar as possible. Again, your average home today is on "the grid"---there is no need to separate power sources with regard to power sinks. But in a more permie home, you might have all of the efficient lighting driven by one pack of batteries....that is maintained by one source of power (PV, wind, thermoelectric, etc.) whereas the other loads are provided by a different source. Maybe?.....thoughts?
Edit: Interesting link in this regard....let me know if the link is blocked: https://pangea.stanford.edu/ERE/pdf/IGAstandard/SGW/2014/Li.pdf