View Single Post
Unread 06-04-2005, 10:13 AM   #39
dnkroz
Cooling Neophyte
 
Join Date: Jan 2003
Location: Spain
Posts: 25
Default

Thank´s Incoherent

And I´m sorry Jaydee116, I feel to have occupied you message


I have worried a little plus this time and have fit the values to 0 by the very slight pressure differentials due to the assembly, little mmHO to appreciate better the differences. Practically any altitude, few mm of difference between both sensorial is appreciable varying the hydrostatic pressure.

I have tested uniting both tubes more than I have been able being the piezométrics tubes to 3.5cm and the results have been these.






It is possible to be appreciated that the delay no longer is measurable by the system and that the waveform is very similar. He is peculiar that at the beginning and at the end of the wave, forms a slight emptiness when the restriction and therefore the static pressure is low.
It can be due to the phase angle between the rotor and stator produced for the reason that comments that the impeller and the rotor are not firmly united and is possible that at the moment in which it must make force suddenly, it can will be out of phase slightly. In the synchronous motors it is not difficult that it happens. Or simply it is due to inertias of I eliminate although they would seem to me too fast.

Memory that the circuit is united to a deposit opened to height of the ground of the room
Also, whichever minor is the restriction and therefore smaller the generated pressure, greater is the initial tip of pressure in relation to the following ones. According to the collected data, the maximum obtained pressure 2314mmHO and minimum of -489mmHO has been.



In the following graph, I have measured the pressure differentials between the ends of a copper tube of 1.67m of length and 10mm of internal diameter.
It is possible to be verified like indeed that delay is not due to the possibility that I commented of which the silicone tube expanded minimally producing that delay.

The delay appreciated is 33msec (5224 redline-5257msec blueline) with which the speed of the pressure front becomes to locate in 50,6m/sec. The speed is practically the same one. It is to hope that with another pump and other diameters that speed changed.
The difference of this graph with respect to the previous one would be in which no longer the initial emptiness by the greater restriction of the copper tube takes place, but in return the final emptiness is different. The emptiness indicated by the red line is always positive and the one of the blue line is alternating. It seems by ricochet like a species due to the mass of water or to the same pump.
The greater pressure indicated by negative the blue line as much as positive would indicate the direction of the final of the wave, would indicate the direction of the water obstacle.




Many of these things do not influence directly in the refrigeration, this is circumstantial and it worries to me plus seeing as temperatures, pressures and flow are interlaced, but they are peculiar details of knowing and appreciating.
The studies that could be done with the suitable sensor, humidity, vibrations, magnetic field can be innumerable.

Luckily I can put images, if it had to express to me only with words I believe that it would not be understood to me.
dnkroz is offline   Reply With Quote