----- Original Nachricht ----
Von: Jed Rothwell <[email protected]>
An: [email protected]
Datum: 08.12.2011 15:59
Betreff: Re: [Vo]:Will tests surface mounted thermocouples on pipe
> <[email protected]> wrote:
>
> >
> > It is necessary to think about unexpected effects:
> > It is clear, in Rossis setup there was a thermal flow and an unwanted
> > temperature difference close to the thermoelement.
> > If the steam inlet was 100 degree and the water outlet was 20 degree then
> > inbetween in the middle symmetry point the temperature MUST be (100+20)/2
> =
> > 60 degrees. This is simple to see from the symmetry.
> >
>
> That is incorrect. See:
>
> http://lenr-canr.org/RossiData/Houkes%20Oct%206%20Calculation%20of%20influen
> ce%20of%20Tin%20on%20Tout.xlsx
>
> I did some tests last night with a flexible hot water pipe tied to a cold
> water pipe, under insulation, with the sensor on the outside of the hot
> water pipe. Tying the two together and putting them under the insulation
> had no measurable effect on the surface temperature. The only thing that
> affects the temperature is the hot water flowing through the pipe.
>
This depends from the thickness of the pipe wall. If the wall is thin, the
coupling to the water is very strong and other factors can be neglected. If the
wall is thick, then the crosscoupling increases.
If the geometry is unknown, then the crosscoupling is unknown.
The easiest way to avoid this problem, is: make the distance much longer than
the pipe diameter.
Then everybody sees there is no relevant crosscoupling.
Peter
