Hello all. So, I have been experimenting with heating Nitrogen backfill for a vacuum oven application, but I do not think that I have had much success with getting the gas heated. I created a basic heat exchanger using a 25' 3/8" wort chiller submerged in a large pot of oil on a hotplate controlled by 15a temp pid and accurate probe submerged in oil. I have a single regulator off of the tank and a series of ball valves before and after the chiller. Things seem to get weird with the regulator when I expose it to a vacuum. I had my regulator set at ~10psi and my oil temp at 190F.
So, my questions are:
I was previously isolating the nitrogen in the chiller with the ball valves and allowing temps to rise. If gas comes in chiller at 75F and 10 psi, how much pressure increase will there be as temps rise?
I understand that higher psi will allow more gas to heater faster, but how much time would be needed to fully bring gas up to temp?
Is there a better way to do this (heat and deliver a volume of nitrogen to a desired temp)?
So, my questions are:
I was previously isolating the nitrogen in the chiller with the ball valves and allowing temps to rise. If gas comes in chiller at 75F and 10 psi, how much pressure increase will there be as temps rise?
I understand that higher psi will allow more gas to heater faster, but how much time would be needed to fully bring gas up to temp?
Is there a better way to do this (heat and deliver a volume of nitrogen to a desired temp)?