Dave, I agree. You have described the process very well. The only
thing missing from your model is the thermal contact between the
source, (Ni) and the sink (the mass of the E-cat). The better the
thermal contact, the longer the temperature can remain high while
control is maintained and the less external power is required to keep
control. In fact, a better design would be to have the heaters inside
the container while the Ni was against the outside wall of the
apparatus. This way, energy from the Ni could flow directly out and be
radiated into space, which would allow for a fast cooling rate of the
Ni once the internal power was turned off.
Ed Storms
On Jun 2, 2013, at 3:10 PM, David Roberson wrote:
Eric,
Model 1 appears to be more in line with what I suspect is happening
except for the explanation of the lack of external heat for control
issue. You need to consider that the peak heat power being
generated inside the core is only about 2 times greater than the
resistor heating required to control it at the turn around point.
Rossi has stated this on several occasions and it matches my model.
When such a large percentage of the net power at that node is taken
away abruptly, a turn around in temperature direction occurs. This
is a complicated positive feedback system where a large fraction of
the internally generated heat is being absorbed by the thermal mass
of the device. Enough external heat is removed to force the core to
be "starved". That reverses the temperature path. Once reversed,
the positive feedback works in a manner that accelerates the falling
core temperature toward room.
If you are very good, or lucky, you can reverse the core at just
below an optimum point which will allow the temperature to languish
there for an extended time before it begins it rapid decent. This
is how you achieve a high value of COP. The core has a lot of time
during which it puts out large values of heat energy before
requiring a refresh drive pulse. The drive remains off for a longer
time while the high temperature lingers.
Does this help to explain the operation according to my model?
Dave
-----Original Message-----
From: Eric Walker <[email protected]>
To: vortex-l <[email protected]>
Sent: Sun, Jun 2, 2013 4:39 pm
Subject: Re: [Vo]:Ethics of the E-Cat investigation put into question
On Sun, Jun 2, 2013 at 1:22 PM, David Roberson <[email protected]>
wrote:
The resistive heating requirement is to be able to reverse the
temperature excursion at the proper time by removing the extra
input. Constant heat input will result in the destruction of the
device when useful output power is generated.
Dave, I don't disagree with this assessment. But there's a subtlety
that the original question is getting at. I don't know how to
express the idea with much accuracy, but consider two different
models:
There is near-uniform heating in the charge. Temperature above a
certain point kicks off the reaction. Once going, the reaction
itself feeds energy back the into bulk of the charge, where it has
been generated, and the reaction becomes self-sustaining.
There is non-uniform heating in the charge. Heat flows from hot
spots to surrounding areas. The heat that dissipates from hot spots
can either be (a) sufficient to kick off the reaction elsewhere or
(b) insufficient, in which case it is just dissipated. There is a
threshold temperature below which you get (b) and above which you
get (a).
It seems like a mixture of gasoline or a load of coal that has been
ignited is generates heat somewhat uniformly and follows model (1).
It seems that model (1), if applied to the E-Cat, would make the
resistance heaters superfluous, however. So I take it that we are
forced into model (2). To someone approaching things without
further context, it's not clear why model (1) would not apply, and
that would raise questions about the resistance heaters. Further, I
think we have to assume that the heating transients in model (2) are
quite high, since there is the possibility of runaway. These are the
subtleties I'm getting at. It seems that the requirement for
resistance heaters places constraints that can be used to infer
useful information about what is going on.
Eric
