After some calculations, I think it is better to use the MPG-D751. See below.
On Tue, Dec 27, 2011 at 3:17 AM, Aussie Guy E-Cat <[email protected]>wrote: > The 2.5 x 2.5 mm device has a max power output of approx 0.8 mW at 10 deg > K differential. Assuming 1 Watt excess with a COP 5 yields 200 mW input. > Would need around 300 of the MPG-D615 devices with fitted finned heat sinks > to each device's COLD side to get good thermal transfer into the air. > Could be doable with 75 devices per finned heat sink assembly per side of > a square container. This is exactly the set up I had in mind. > Optimal load resistance could be a issue. Something to look at in the > future. > Using the data in http://www.lenr-canr.org/acrobat/DashJcoldfusion.pdf(slide 20), one can estimate that the average voltage required in a PdD cell is about 5,7W / 1.5A = 3.8V (see also slide 11). One MPG-D751 can provide 1.2V at about 1mA with 10 deg K differential (see http://www.micropelt.com/down/datasheet_mpg_d651_d751.pdf voltage x current graph), i.e., 1.2mW. Using the circuit shown in http://www.national.com/pf/LM/LM2621.html#Overview we can elevate that to 3.8V. Assuming an efficience of 50% (it should be better than that, see http://www.ti.com/lit/ds/symlink/lm2621.pdf), we have 0.6mW per MPG-D751. To achieve 5.7W, we have to put 5.7W / 0.6mW = 9,500 MPG-D751 in parallel (and use at least 2 LM2621 circuits). These will occupy about 9,500 x 4.248mm * 3.364mm = 135,758mm2. This is a square of ~368mm on each side. Using a rectangular recipient and putting these 9,500 units on its 4 lateral sides, we have a minimum lateral side size of 184mm x 184mm, or ~18cm x ~18cm. If I did the math correctly, it is doable. But we need a COP of 20 or more (not considering peak power eventualy needed during reaction startup and/or control). Cheers, Alberto. > AG > > > > On 12/27/2011 2:42 PM, Alberto De Souza wrote: > >> I'm a new member of the list, but I'm reading the posts since January. >> I'm addicted... >> >> If we have a large COP (10-100), I believe we can use thin film >> thermogenerators >> (http://en.wikipedia.org/wiki/**Thermoelectricity<http://en.wikipedia.org/wiki/Thermoelectricity>) >> such as these >> http://www.micropelt.com/down/**datasheet_mpg_d651_d751.pdf<http://www.micropelt.com/down/datasheet_mpg_d651_d751.pdf>to >> make a self sustain wet cell... We can put thousands of those around a >> wet cell. They produce useful power with as little as 10 degrees Celsius >> (see datasheet). >> >> Cheers, >> >> Alberto. >> > >
