Hi again FC,
[Edit note: The original data in this point has been replaced with corrected data. I was using the wrong thermocouple calibration setting Jvs K]
I completed some more testing with the EQV. This data set is more applicable to all of us because these transient experiments replicate how the device is actually used as opposed to the steady-state data which is VERY misleading. Note that these experiments were completed for my own entertainment purposes but I thought I would share in case this helps/entertains anyone else.
The pic below shows the setup for this set of experiments. The thermocouple was placed just above where the screen sits in the cyclone bowl and was axially centered. The TC location actually makes a great deal of difference so care was taken to make sure the location was the same every time. The TC data was taken digitally at a frequency of 1 s-1.
The following measurements were made after a full warm up and at least 5-10 min was given in between runs to let the unit come back to its initial state. There did seem to be some hysteresis behavior in that the unit does not cool down as fast as the temperature indicator would have you believe. If you are going from high to low temp, it's best to run the fan for a few minutes after you decrease the temperature to help it cool and then allow it to rest for a few more minutes before using it (due to heat soak). Since most people start low and increase temps as they vap, this shouldn't be much of an issue but it is something to be aware of.
The following chart contains the time series cyclone bowl temperature data for different setpoint temperatures. The elbow was inserted and allowed to soak for 2min before the fan was turned on to F1. In general, 90% of the maximum temperature was reached in 10 seconds after starting the fan and were nearly identical to the temperature setpoint/readout, ~0-10C difference (see below in the comparison versus the elbow)..
This chart shows the difference between letting the unit heat up for 5 min and then running at 200C versus a full warm up of 20-30 minutes.
I'll do the elbow temps next...
EDIT: below are data posted in later posts. I pasted it here as well so it is in one location. These data are also corrected for the TC fuck up.
Elbow versus cyclone data. Elbow is about 10-20C cooler over the temperature range 175-230C.
Here I was concerned with how the fan speed affects air temperature. The conditions were T,setpoint = 200C, full-warm up, and measuring the temperature in the center of the elbow where the would normally sit. The data was collected starting with a room temperture elblow. The elbow was allowed to sit on top of the unit for 2 min before turning the fan on.
Time-series temperature versus Fan speed
Max temperature versus fan speed
The main conclusion here is that there is a significant decrease in air temperature with fan speed. Basically the heater quickly cools off and is either incapable of keeping up at high fan speeds or the temperature controller is poorly tuned. This explains why bag hits are best at F1. At F2 and F3, the air temperature cools off quickly and you're not really vaping much anymore.
The fact that the heater temperature readout on the display never moves during these run is concerning. I am inclined to believe that the controller is programmed to lie to us or the temperature readout has nothing to do with temperature (maybe just correlated to heat duty or something; i.e. 200C = 70% heat duty).
If it weren't for the warranty, I'd be inclined to dig into the unit to see what's going on in there....[Edit: I did....post to follow]