kirk wrote:
> I know the chimney
> needs hot gases to work,
>
> Since it is reduced density generating the needed lift it seems to me you
> could use a well insulated stack and extract the heat at the last moment.
True. However, as long as the stack remains inside my house, it contributes
to space heating.
<snip>
> If
> you want to discuss it on micro
> cogen it is fine with me. Cogen is cogen. I just advocate diesel because it
> is off the shelf and top efficiency.
I haven't discussed it because my system isn't working! When I did this
with steam, I ended up with less than 1% conversion efficiency from wood to
electricity. If my math is right for the Rankine cycle, I'll end up with about
17% conversion efficiency using the lower temperature working fluid without
superheat. That's more than enough! I can use the "waste" heat for domestic
purposes.
>
> I suppose there would be lots of problems powering a Brayton cycle with
> wood. Charcoal might be ok but I think wood has lots of goop problems. I
> suppose your wood heated closed cycle is a reasonable compromise.
>
The cyclical effect of wood burning, coupled with the high latent heat of
water, stabilizes the expander's operation. I plan a "vapor cycling" system
that only activates the expander when vapor pressure reaches a set point.
(Batteries don't care if their charging is intermittent.) Wood burning also
eliminates the need for feed stock pre treatment characteristic of gasification
systems, and the serious energy losses involved in creating charcoal. It
wouldn't be a perfect system, but it would be nice if I could actually get it to
work!
robert luis rabello
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