On Oct 11, 2011, at 2:44 PM, Alan J Fletcher wrote:
At 01:50 PM 10/11/2011, Jed Rothwell wrote:
Anyway, there are multiple cells and only one cell was in use
during this test.
I assume each of the 4 cells has its own reservoir, so 30 L / 4 =
7.4 L.
That's not my interpretation.
The fat-cat is a big tub of overall volume 110 litres.
The "wafer" is 20 x 20 x 4 cm = 1.6 litres
Lewan's report says: "Inside the casing metal flanges of a heat
exchanger could be seen, an object measuring about 30 x 30 x 30
centimeters."
Was that a typo?
It's not stated whether each core has its own wafer, or if multiple
cores are in the same wafer.
The rest of the space is taken up by "steel wings" -- presumably we
can see one of them -- the corrugated object at the top of Lewan's
picture.
What's left over is 30 liters, which doesn't "belong" to any core.
(Again, 2 hours to fill at 15 litres/hour doesn't match Lewan's 0.9
g/s)
I've seen that 30 liter number somewhere before too. I don't recall
where. It does not jive with the apparent dimensions though.
I looked for a hose between the core and the outlet of the ecat --
but couldn't see it -- because there isn't one.
The outlet is just a bent tube coming out of the top of the eCat --
with a hole at the top serving as the instrument port.
Again, I couldn't see any trailing wires in the lid, so the
thermocouple must be right in the outlet tube.
The thermocouple used has a handle on it and a long probe. It may
well reach the radiator fins.
One thing that concerns me is the seal holding the probe in place
would have to be very good to keep the probe from blowing out of the
hole, or the hole from leaking, if the device is under pressure.
I'll have to think what this means for Lewan's September case, with
120C at the outlet, and 50% water !!!
The only rational explanation is 2 bar 50% dry, with excess water
just bubbling up through the outlet tube.
The primary circuit is open. How can the E-cat maintain a 2 bar
internal pressure? If there is a pressure restriction it would have
to be in the horizontal part of the thermocouple mounting T, on the
leg away from the thermocouple.
Best regards,
Horace Heffner
http://www.mtaonline.net/~hheffner/
