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Thread: Ultra-low temperature system
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08-11-2010, 03:40 PM #1
Ultra-low temperature system
Dear all,
I'm hoping to put together an ultra-low temperature two-stage cascade system that can go down to -90 degrees C. I'm planning on running it routinely at -80 degrees C so just want the extra 10 degrees for tolerance!
Additionally, I need a system that supplies a cooling capacity of 200 W at -80 degrees, which equates to a cooling capacity of ~ 5 kW at 20 degrees.
At present, I think I need a two-stage cascade unit using R404A and R23 refrigerants. However, I don't know what size compressors are required. Can anyone give me an idea of how I could calculate that or if they have experience in this area?
I've heard that Danfoss compressors are well respected in this area?
I know that you can buy similar products that do the job. Julabo make a unit (FPW91-SL) that do the job but I don't need all of the control hardware that surrounds it - nor can I afford the price!
Thanks and look forward to your comments.
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