- Apr 27, 2002
liquid helium setup.
Colder than Ln2... Will do 14K
This is setting on my kitchen counter.... it's a cryopump 2 stage displacer uses helium
Fugger has the heliumcompressor and all we have left to do is hook this baybe up... It Should do -180C @ 200W if I can the first stage displace to run at 100%.
Well I will try it in a month or so but it will do only [email protected] and if I am guessing correctly it will be around 200+W @ 150k -123C Really insulation will be a #@@$%@^.
This uses a 5 hp heliumscroll that removes the heat generated by the two stage displacer in the cold head in the pic. A displacer has a heat absorbing disk that will modulate at about 5khz in the head to transferr the heat from the cooling surface to the rejection surface this in turn s cooled by the heliumgas.
I think it's called the jenken cycle. Simmilar in function to a stirling displacer...
Really this is a cryo pump used to cool superconducting magnets in an mri imaging system. Nitrogen can't get as cold as this thing.
It will go to -259C or -434F
It will only cool a 1Watt load at those temps. -123C @ 200Watts though. I think Fugger has maybe $300 in it Ebay or something> Bought in pieces and now almost ready to go.
Actually a functional unit rebuilt is 5 to 40 grand depends on how many hours on it.
Sometime after Feb 1 need to do ces (consumer electronics show) first....
This is a cryo pump and is used in vacume chambers, this is a tame one there are cryo pumps that can go down to 2K ...-456.07
The other end of this is a five hp water cooled helium compressor, It uses absorbers in the discharge to get the proper density of hydrogen. This cryo pump will freeze nitrogen.
IBM has had CPU's at -200 and lower, they discovered that CMOS's switching speed is doubled at these temperatures.. what we are finding from the Ln2 guys is that around -120 something is happening that wipes out the processors. It may be that the dissimilar elements of the processor are contracting at different rates and this is the breaking point???
Not really, it is acryo pump, it does have two displacer pistons and two drive motors. One for high temp operation (40K) and one for low temp operation ( 14K ) It is simmilar in operation to a stirling engine in that it has a displacer to move the heat from the cold side to the hot side but it actually needs helium circulated through it to remove the heat from the hot side. For this it uses a a water cooled condensing unit running a five horsepower scroll compressor.
Jenkin/stirling... This is an ADP DE-202 and it is cooled with helium
Simmilar only they don't call it a stirling engine... Same principle.
Just add another one in front of that one and then have the heatrejection area cooled by a condensing unit (5hp)
I don't think the DE 202 has enough capacity to cool a processor, I Can't find any stats on this cryopump for -100 to -200C operation??? any Ideas... I am going to test it at this under a pelt load jus to see?? I will post results... The water cooled condenser that cools it is going to be hooked to my swimming pool which it currently at 39degF 36,000 gal so we'll see.
liquid helium setup.
Last month I picked up a Cryo compressor off ebay for $100 without knowing too much info based upon auction.
Well much to my surprise it is a Helium cryo compressor in good working condition. Still under pressure.
Now I am making the decision to build a box to freeze or build a huge evaporator loop for GPU/CPU/Chipset/RAM
I will post a complete set of pics
This cooler was made to cool very very large electric generator. This unit was the spare.
Nothing special about the cooling lines as they are standard copper.
The compressor itself is water cooled
Im about a month away from having the unit mounted and wired into its spot in our new building.
We have a few engineers on staff who are complete boggled at the stuff I come up with. WTF can you do with -300c?