Good Introduction here, I suppose Anne R will now have to set up a series of articles in Design News for the subject(s) ... it deserves more research ... will spend a little time this week doing more ...
a bit different from TEG, there is something called "thermionic" which does not rely on thermal difference, i believe, although it needs higher temperature. i belive that Thomas Edison observed this thermionic effect. is it used anywhere, Paul?
Regarding slide 15, note that deltaT simply drives the heat flux, and is much easier to measure. The heat flux is used in the energy conversion, that's why Rteg (thermal) should match Rsink (thermal). If you maximize Rteg, you minimize heat flux.
@AlaskaMan and rruther - thanks for the 'great white north' application info -- perhaps in Alaska you can find heating applications that you can use to get the large temperature gradients needed for TEG
Paul, I'm unclear about the way piezo devices perform. Is the voltage produced a function of the strain only, and independent of the rate? Also, in slides 9 and 10, the power curves show lower frequencies generating higher power. That seems backwards.
Perhaps I did not understand, or missed something. On slide 23. If heat sourse is on bottom, and we want to keep the cool side cool, shouldn't "Acceptpable orientation" really be the idea? Why does the pink and purple side have to both face the heat source?
I've learned that some TEG series are better for power generation than 'regular' cooling TEG devices. Those meant for power generation are sealed to keep condensation out and have a max differential temperature. This may be worth bringing up so people don't take the first TEG they find and hope to have good results.
The Alaska Railroad from Fairbanks to Anchorage uses photocells & batteries to control rail crossings. They probably need a boost from a vehicle during the sub-arctic winter months. No commercial power for most of one hundred miles with spotless performance.
From a Cultural Anthropologists' viewpoint, what is your opinion on Energy Harvesting in particular, but perhaps more broadly, energy (and resource) utilization in general (OK, OK, the topic of a thesis I suppose) :)
The streaming audio player will appear on this web page when the show starts at 2pm eastern today. Note however that some companies block live audio streams. If when the show starts you don't hear any audio, try refreshing your browser.
Yesterday the LTC3105 (day 2, slide 10) was introduced.
TI seems to have a comparable part, the BQ25504. The DigiKey website says:
Texas Instruments' bq25504 is the first of a new family of intelligent integrated energy harvesting nano-power management solutions that are well suited for meeting the special needs of ultra-low power applications. The product is specifically designed to efficiently acquire and manage the µW to mW of power generated from a variety of DC sources such as photovoltaic or thermal electric generators.
What should be the perception of a products real-world performance with regard to the published spec sheet? While it is easy to assume that the product will operate according to spec, what variables should be considered, and is that a designer obligation or a customer responsibility? Or both?
Biomimicry has already found its way into the development of robots and new materials, with researchers studying animals and nature to come up with new innovations. Now thanks to researchers in Boston, biomimicry could even inform the future of electrical networks for next-generation displays.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.