Hi,
Please let me know which table format suits you the best, I can upload it for you accordingly.
The transfer function is:
T = 3.30758E-09 * t^4 - 7.70310E-06 * t^3 +4.17181E-03 * t^2 - 7.85164E-02 * t + 27.10683
I hope this can help.
Hello again,
Thank you for that it's very clear.
Correct me if i am wrong, but this looks like a function that starts out around 27.1 at t=0 and as time progresses to about t=10 seconds the temperature drops to around 26.7 and then as time progresses further the Temperature just keeps rising and as time progresses more it becomes apparent that the temperature increases even faster which indicates thermal runaway.
The question i have now then is, what happens if i apply power for 100 seconds (Temperature rises to about 53.6) and then suddenly disconnect the power completely, what happens to the Temperature then?
I ask because there seems to be no heat storage anywhere because there is no initial value for the Temperature after some heating has already occurred. It would be very strange if the Temperature dropped suddenly back to 27.1 degrees. Is that even possible? Normally we have some thermal time constant.
For example, for a different system we might see this:
Vout=E-(E-Vc)*e^(-t/(C*R))
where
Vout is the voltage across the capacitor after time increment t,
E is the driving voltage source level,
Vc is the initial voltage across the capacitor,
C is the capacitance,
R is the resistance.
In a thermal system, this could be:
Vout is the final temperature,
Vc is the initial temperature,
C is the thermal capacitance,
R is the thermal resistance.
The main point is that Vc is the initial capacitor voltage so if we drop the drive E to zero, the capacitor voltage does not suddenly drop to zero (which would be a sudden compete discharge) but gradually drops exponentially until the drive E again goes up and so the capacitance starts to charge again.
So what we need to know next is what happens when the power is disconnected after some heating has occurred in the past. There should be another function or something that describes this behavior.
Any thoughts on this?