Need Help - Cooling Flat Plate with LN2
Need Help - Cooling Flat Plate with LN2
(OP)
I have a flat plate (~16in^2) that has enough heat input to get upwards of 500°C during processing. I have been asked to look into cooling it with LN2. I don't even know where to begin. Some of my questions are:
How do I provide a specific flow rate of LN2 at pressure to cool surface?
What kind of nozzles do I use with LN2?
We use quite a bit of LN2 in other processes, is LN2 a cost effective means of cooling in a production environment - semi-continuous process?
What are some good online resources for ideas and hardware for designing LN2 cooling processes?
Thanks in advance.
How do I provide a specific flow rate of LN2 at pressure to cool surface?
What kind of nozzles do I use with LN2?
We use quite a bit of LN2 in other processes, is LN2 a cost effective means of cooling in a production environment - semi-continuous process?
What are some good online resources for ideas and hardware for designing LN2 cooling processes?
Thanks in advance.
"To be or not to be, that is the question" - William Shakespeare via Hamlet





RE: Need Help - Cooling Flat Plate with LN2
What's the heat capacity of the plate?
How quickly do you want to cool it?
How much LN2 do you have?
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RE: Need Help - Cooling Flat Plate with LN2
What is temperature is the plate desired to be during production?
What is the power dissipation that's heating the plate?
Keith Cress
kcress - http://www.flaminsystems.com
RE: Need Help - Cooling Flat Plate with LN2
The amount of heat that you need to remove in what time period is the important info.
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P.E. Metallurgy, Plymouth Tube
RE: Need Help - Cooling Flat Plate with LN2
RE: Need Help - Cooling Flat Plate with LN2
Heat of vaporizations (kJ/kg):
water: 2257
nitrogen: 199
So, water is basically 11x more useful for cooling things above 100C
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RE: Need Help - Cooling Flat Plate with LN2
LN is only a good option if you need very low temps, and you have to vent into a controlled space.
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P.E. Metallurgy, Plymouth Tube
RE: Need Help - Cooling Flat Plate with LN2
True, that, but steam isn't really that much more useful that gaseous nitrogen from a cooling perspective. Once below 100C, water is marginally better than LN2, 293 kJ/kg(70C delta temp) vs. 199 kJ/kg, but, presumably, water is much cheaper to condition for cooling.
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm
RE: Need Help - Cooling Flat Plate with LN2
COME IN elfman!
Keith Cress
kcress - http://www.flaminsystems.com
RE: Need Help - Cooling Flat Plate with LN2
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm