On Sep 27, 2011, at 9:27 PM, Peter Gluck wrote:
Dear Horace,
The missing variable is cooling water flow- to be established by
Rossi- water that carries the excess heat generated by the 52 (?)
Fat Cats and is partially transformed in steam- F1.
To achieve accuracy in delta T measuring the condensing water flow
rate should be adjusted to the flow rate of the steam. If the flow
is too high the delta T is small and even very small errors in
measuring T translate into very large errors in delta T. If the
device enthalpy varies rapidly then it is much easier to adjust the
cooling water flow to a longer term moving average than to
instantaneous measurements.
The flow of mixing water- condensing the steam is say, 5-10 times
greater than F1 see please the "formula" given in my paper.
Like most people I don't generally go looking for a URL if it is not
provided in a reference.
What matters is not the mixer cooling water flow rate but its
combined temperature and flow rate. The flow has to be matched to
the steam thermal power, mass flow, and cooling water temperature in
order to achieve a significant delta T. This problem does not exist
when the steam is condensed into a very large thermal mass of water -
provided the large mass is kept in a useful temperature range, and
the thermal power from the secondary cooling circuit is matched to
the device thermal power. If the thermal mass is large enough such
matching can take place gradually and even manually, provided it is
properly recorded.
No peristaltic but other types of positive displacement pumps to be
used,
I said, "Unfortunately my two peristaltic pumps are too small for
this power range." This does not imply that I would even consider
trying to buy large peristaltic pumps. Perhaps we have a language
barrier. Also, the flow rate for the cooling water should ideally be
adjustable to the thermal power output of the device if that is
variable and unpredictable. An adjustable flow rate pump, or a
selection of pumps, would thus be useful for driving the secondary
cooling circuit.
e,g. gear pumps- for which the flow is not influenced by
counterpressure.
The flow rate of gear pumps is influenced by a pumping into a large
pressure head, both due to rpm loss (slip) for AC induction motors
under load, and due to rotor seal leakage under high pressure. In
the case of the new Rossi device, it looked like perhaps the water
flow was entirely blocked towards the end of the test. This would
create as large a pump pressure head as required to terminate flow.
The evidence for flow blockage was the high pressure the device was
under at the end.
This system measures the enthalpy in any moment, Including the
start up period and possibly the heat after death.
The mass flow measurement depends on measuring the mixer exit mass
flow. This flow likely contains bubbles, is not well thermally
mixed, and has fast dynamics requiring fast sampling times. Some
degree of smoothing increases reliability of the numbers and reduces
the required sampling rate. A large degree of smoothing provides a
first principle check on the flow calorimetry numbers. Of course, in
the case of Rossi's device any even low precision mass flow
calorimetry is an improvement. In the case of my own work I would
like some degree of consistency checking. A hybrid method provides
this consistency check.
The formula for efficiency is actually O/3I because electrical
energy is at least 3 times more valuable or expensive than
thermal energy
That is not a formula for efficiency but relative value.
Peter
On Wed, Sep 28, 2011 at 7:38 AM, Horace Heffner
<hheff...@mtaonline.net> wrote:
On Sep 27, 2011, at 9:35 AM, Jouni Valkonen wrote:
2011/9/27 Peter Gluck <peter.gl...@gmail.com>:
The simplest solution is to use a Steam Water mixing valve,in which
the
heated mixture coming out from the demo is mixed with a constant
flow of
cold water, you can know the enthalpy performance in any moment.
Indeed, continuous experiments easiest way is to use enthalpy sensors,
that gives as total enthalpy for any given moment. Even more simple is
to measure the steam pressure inside E-Cat, because it gives directly
the total enthalpy, but of course we need to first calibrate this kind
of enthalpy sensors.
–Jouni
You have again not specified the precise method you would use.
It would appear you have a case of missing variables. The
principle missing variable is mass flow, m dot, which is best to
isolate and measure directly.
Best regards,
Horace Heffner
http://www.mtaonline.net/~hheffner/
--
Dr. Peter Gluck
Cluj, Romania
http://egooutpeters.blogspot.com
Best regards,
Horace Heffner
http://www.mtaonline.net/~hheffner/
