Thanks Fran. I would love to be able to just see the XH to start. It would be a happy circumstance to then go on to evolve the software control to regulate temperature by modulating the thermal load.
I am most of the way through making the small pieces for the convection system (it will have 4 ball bearing mounts). All of this needs to be capable of working at fairly high air temperature (but the drive motor will be outside the box at ambient temperature). In the DAQ that I use (Omega DAQ-56), I have 4 counter inputs. I am using 2 of these for radiation counts, and I could use one for tachometer pulse counting from the fan drive shaft. Then I could use 4 of the digital outputs of the DAQ to provide fan motor speed control - so it wouldn't have to be 1 bit on/off. On Wed, Mar 4, 2015 at 7:28 AM, Roarty, Francis X <francis.x.roa...@lmco.com > wrote: > Bob, very nice design [I downloaded from home] and realized the > gas/plasma inside the tube is a far superior transfer medium. I understand > your purpose of only transferring heat in case of temp increase when the > drive is removed for calorimetry BUT would you also consider dual use as > part of the control loop instead of just for calorimetry.. this would be an > additional [luxury] test where instead of only on to dampen temperature > rise it is always on at mid speed requiring much more heat from your drives > to reach threshold. This would be the “isometric” situation I mentioned > where the cooling fan is fighting the work of the drivers. IMHO this > environment would be more robust at exhibiting the anomaly if it is present > because you have dual controls allowing the drives to be reduced more as > the load is modulated instead to keep the device at the same duty factor of > runaway before being pulled back by increased air flow [push pull of air > flow above and below an average level instead of just on off].. if nothing > else it may provide finer control of the system via combinations of drive > pw and dynamic cooling. > > Fran >
