My problem in first place is i do not understand how i can calculate the thickness of the layer i need. I know that the heat transfer should be calculated, but i do not understand what values should be. For example i get 200 W as the result of the heat transfer. But is it good or not? I do not...
Thank you for the answer. Its a little bit complicated, but i try to describe it. I do not want to make a dewar, because i do not have the possibility to make the vacuum. I have the freezer from the picture the link i posted to. it has a top, which is made from glass. I have to made a...
No its not this dewar, its more a freezer. Something like this: https://www.alibaba.com/product-detail/SY-LAB-ICE-CUBE-14S-freezer_166562265.html. The problem is i have to put some mechanics on the top of the dewar/freezer and that is why the temperature on the top of the freezer should be over...
For some experiments a dewar was bought. To make some experiments i need to make a cover at the top of the dewar, for putting some bulks in it. The construction should not be mounted to the rest of the dewar, but some other devices should be mounted with screws on it. The requirements for the...
Hello,
i am trying to design a dewar for experiments at very low temperature. Unfortunately i do not know how to calculate the wall thickness. I can calculate the heat flow through the wall, but i do not know what to do further. Do someone know how to calcualte the thickness of the wall for a...