The thermocouples are not attached directly to any plastic surfaces. They are offset from these surfaces by 1/2 to 1 inch in an attempt to more closely monitor actual air temps as opposed to "component" temps. Once again, with a 3Hz sample rate, you can see in the attached graph a great deal of "saw tooth" in the data; if they were directly attached, I agree you would see much more smooth curves.
I'm not just blowing hot air either!....I design and install industrial ovens bigger than most suburban homes!
Originally Posted by maxcichon
Nice work!
Are the TC's actually attached to the intake tubes and the flange in front of the oval radiator tube using Kaptan tape (surface mount TC's?) If so, I
would think you would be measuring the temp of the plastic and not the air in those locations. If anything, they would read false highs, and tend to flatten out the profiles.
Maybe suspending the TC's on an insulating (wood?) dowel in the airstream would be the way to go.
I saw much the same result in a lillte experiment of my own, however using the NI modules is a better, normalized way to go!
I'm not just blowing wind here, I make and design gas and embedded material thermal measurmentsystems all the time. If you are trying to measure gas, the TC must be supported, by a thermal insulator, in the media to be measured so as not to skew the results.
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