Heat Transfer of a Dewar Nitrogen Container

  • Thread starter rikku95
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Summary
Heat Transfer of an Deware Nitrogen Container
Hello guys, :smile:

So like the Titels says im Trying to get an Approximation of the Heat Transfer which ocours in a Deware container. Unfortunately all my calculations so far seem to suggest way to low Boil off rates for my Container its just to efficient, here is a summary of my Attempts.

First of all I got myself the Heat Conduction formula for an Cylindrical Objekt and for a Circle and my heat conduction coefficient.

Unbenannt.png
1565890522802.png


After i calculated the Heat Conduction in Watts,the next step was the Latent Heat of LN2 And the Density of LN2 Wich is it ;

1565892075765.png


So the Boil off of LN2 form -196 to 21C° in watts is

1565892009981.png



So that´´ s it, after i plug my numbers in i always get way too low Boil off rates for my containers.What did i do wrong?What did I forget?

Heres an Example
1565892134434.png


These are Meters yes, so at an outer radius of 1,05 m and an height of 2 meters only Produces 1,8L/day, i dont think so.

Please help me i am in Great pain :cry:
 

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