After a visit on kingpins website I discovered he has a dewar with handmade low pressure flow head w/pressure release. I want to make this to.
At this moment I need to tilt the dewar sidewides to poor the ln2 in a smaller 1L thermobottle. This is the most dangerous part of working with LN2 imo. Spilling over your hands is easily done.
Can you guy's help me building a system like this in a safe way?
I had an idea after discussing this with unknow_road. The idea is the following.
(beware my paintskills)
The heating element will evaporate some LN2 witch turns into gas. The gas will build up a pressure and push LN2 true the tube. The overpressure releasevalve is already in the dewar preventing it from exploding
My question is, will this work? (I think so)
and how much heat will be needed to create enough pressure? And what kind of heating element can I use (witch will work submerged under LN2)
What materials should I use as pipe? and how can I hold the outside part of the pipe at normal (safe) temps?
I found a nice website with information of a comercial system:
http://www.norhof.com/
The follwing part looks very interesting:
I hope this can be made safely, and help improving safety!WORKING PRINCIPLE
The pressure above the liquid level inside the dewar is carefully controlled and therefor the flow.
With only 100 mBar of overpressure, the lquid will gentle rise out of the rise pipe and fall into the fill hose.
Because we evaporate some LN2 to build pressure, there is no adding of ice inside the dewar, such as with manual systems which use air from the envrioment.
In the Norhof LN2 cooling systems Liquid Nitrogen is stored in pressure less Dewars. When LN2 is required a small overpressure is generated by a micro processor controlled heater element in the LN2, and liquid flows out of the system like water from a tap, without spilling, noise, vibrations etc.
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