Re: need information please!

The bottom cycle is for large installations. Supposedly if you use the
SOFC to generate power, steam to generate power and waste heat for
building heat and hot water, the over all efficiency is about 80%.

Supposedly good for universities and small municipalities.


Dan Bloomquist wrote:
d wrote:

I have not read much about PEMs. I am more familiar with SOFCs which most
reports claim about 40-50% efficiency for 5kw systems with claimed potential
effiency of 60% and higher efficiency if the high quality heat is used for
other applications such as heating water (or creating steam to generate more
electricity). I only bring this up because new thin film technology brings
the potential of shrinking the system enough to stuff inside a car.

It will fit in a vehicle now. A few years ago they had power density
down to better than 2kw/liter. You may not be able to tow a day cruiser
from Sacramento to Reno in quick order, but for commuter, (civic like),
applications....

As for a bottom cycle, it may be worth while. I don't have enough info
other than the quality of heat for the source is quite nice. If you can
build an 800-1000c bank that will have a decent lifetime I don't see why
not. The trade off between high temp and lifetime is an issue. That is
why they are working on lower temp SOFC. But then you trade off the
bottom cycle and top cycle efficiency.

Like the guy said, 'If we had some green eggs...'

Best, Dan.

--
"We need an energy policy that encourages consumption"
George W. Bush.

"Conservation may be a sign of personal virtue, but it is not a
sufficient basis for a sound, comprehensive energy policy."
Vice President *** Cheney

.

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