Jones Beene wrote:
I should add one thing relevant to the Swedish testing.
We presume (hope) that the Swedes will not use a hose connected to plumbing
where you get free water pressure, and will use a pump. The pump's power
must be included in P-in.
In flow calorimetry it is not possible to measure the power of the
circulation pump, because the pump adds heat to the water before the
water passes the inlet temperature sensor. You can only detect heat
generated between the inlet and the outlet. Furthermore, the power from
the pump, mechanical, electrical and from pressure, are far too small to
be measured by this equipment. It would be on the milliwatt level.
In the tests conducted by Levi, they begin the calorimetry before
turning on the cell. It shows no measurable temperature difference.
There are no unaccounted-for sources of heat in the system. At least,
none that can be detected with this equipment, at these flow rates.
The water pressure in the plumbing is not "free." It is produced by a
pump, or a gravity feed tank fed by a pump. The pump is not in the
laboratory; it is at the local reservoir, but pressure is pressure, no
matter where is is generated.
- Jed
