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Pumping Liquid Nitrogen
I have been offered a small (about the size of a water cooler) liquid nitrogen generator at an attractive price. It generates four and a half liters per day, using a gravity feed to keep a half liter dewar filled. I want to pump the liquid nitrogen into a hole drilled into the heatsinks of the CPU and GPU of a gaming PC so I can overclock them farther than otherwise possible. (This is for a a "just for fun" personal project, not for work). My question is how best to pump the liquid nitrogen. In the past I have worked with big dewars and let them self-pressurize with a relief valve on top and a feed tube going to the bottom -- sort of like an aerosol can. This doesn't look feasible in this case; the back pressure seems like it will back up the gravity feed. I think I need a small pump that can take the cold and not add too much heat to the liquid nitrogen. Any ideas? BTW, I have seven old 500 MHz. Pentium 3 systems that are ready to be scrapped that I will be doing my initial experiments on before deciding whether to risk a more modern PC. -- Guy Macon http://www.guymacon.com/ |
#2
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Pumping Liquid Nitrogen
"Guy Macon" http://www.guymacon.com/ wrote in message ... I have been offered a small (about the size of a water cooler) liquid nitrogen generator at an attractive price. It generates four and a half liters per day, using a gravity feed to keep a half liter dewar filled. I want to pump the liquid nitrogen into a hole drilled into the heatsinks of the CPU and GPU of a gaming PC so I can overclock them farther than otherwise possible. (This is for a a "just for fun" personal project, not for work). My question is how best to pump the liquid nitrogen. In the past I have worked with big dewars and let them self-pressurize with a relief valve on top and a feed tube going to the bottom -- sort of like an aerosol can. This doesn't look feasible in this case; the back pressure seems like it will back up the gravity feed. I think I need a small pump that can take the cold and not add too much heat to the liquid nitrogen. Any ideas? BTW, I have seven old 500 MHz. Pentium 3 systems that are ready to be scrapped that I will be doing my initial experiments on before deciding whether to risk a more modern PC. -- Guy Macon http://www.guymacon.com/ Let me be the first to say, "that's going to be cool." :-) Mike |
#3
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Pumping Liquid Nitrogen
Guy Macon wrote:
I have been offered a small (about the size of a water cooler) liquid nitrogen generator at an attractive price. It generates four and a half liters per day, using a gravity feed to keep a half liter dewar filled. I want to pump the liquid nitrogen into a hole drilled into the heatsinks of the CPU and GPU of a gaming PC so I can overclock them farther than otherwise possible. (This is for a a "just for fun" personal project, not for work). My question is how best to pump the liquid nitrogen. In the past I have worked with big dewars and let them self-pressurize with a relief valve on top and a feed tube going to the bottom -- sort of like an aerosol can. This doesn't look feasible in this case; the back pressure seems like it will back up the gravity feed. I think I need a small pump that can take the cold and not add too much heat to the liquid nitrogen. Any ideas? BTW, I have seven old 500 MHz. Pentium 3 systems that are ready to be scrapped that I will be doing my initial experiments on before deciding whether to risk a more modern PC. It would be easier to deal with the boiloff gas - it's still at 77K. Do you actually need the LN2? -- Dirk http://www.transcendence.me.uk/ - Transcendence UK Remote Viewing classes in London |
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Pumping Liquid Nitrogen
On Thu, 20 Dec 2007 00:27:26 +0000, Guy Macon
http://www.guymacon.com/ wrote: I have been offered a small (about the size of a water cooler) liquid nitrogen generator at an attractive price. It generates four and a half liters per day, using a gravity feed to keep a half liter dewar filled. I want to pump the liquid nitrogen into a hole drilled into the heatsinks of the CPU and GPU of a gaming PC so I can overclock them farther than otherwise possible. (This is for a a "just for fun" personal project, not for work). My question is how best to pump the liquid nitrogen. In the past I have worked with big dewars and let them self-pressurize with a relief valve on top and a feed tube going to the bottom -- sort of like an aerosol can. This doesn't look feasible in this case; the back pressure seems like it will back up the gravity feed. I think I need a small pump that can take the cold and not add too much heat to the liquid nitrogen. Any ideas? BTW, I have seven old 500 MHz. Pentium 3 systems that are ready to be scrapped that I will be doing my initial experiments on before deciding whether to risk a more modern PC. The only thing that comes to mind is pumps used for liquid fuel rockets. D from BC |
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Pumping Liquid Nitrogen
On Wed, 19 Dec 2007 18:21:56 -0800, "Paul Hovnanian P.E."
wrote: Guy Macon wrote: I have been offered a small (about the size of a water cooler) liquid nitrogen generator at an attractive price. It generates four and a half liters per day, using a gravity feed to keep a half liter dewar filled. I want to pump the liquid nitrogen into a hole drilled into the heatsinks of the CPU and GPU of a gaming PC so I can overclock them farther than otherwise possible. (This is for a a "just for fun" personal project, not for work). What's the temperature spec on the CPU you will be using? Odds are that it won't deal with LN2 temperatures well. Consider the heat capacity of LN2 (include the heat of vaporization) compared to that of H2O. For the complexity of what you propose to do, LN2 won't buy you much more than a good heat exchanger/radiator setup. Also, keep in mind that in an enclosed space (your mom's basement? ;-)) the nitrogen gas will displace air and asphyxiate the user if not properly ventilated. http://www.youtube.com/watch?v=zUc6znC848o CPU cooling with liquid nitrogen D from BC |
#6
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Pumping Liquid Nitrogen
Guy Macon wrote:
I have been offered a small (about the size of a water cooler) liquid nitrogen generator at an attractive price. It generates four and a half liters per day, using a gravity feed to keep a half liter dewar filled. I want to pump the liquid nitrogen into a hole drilled into the heatsinks of the CPU and GPU of a gaming PC so I can overclock them farther than otherwise possible. (This is for a a "just for fun" personal project, not for work). What's the temperature spec on the CPU you will be using? Odds are that it won't deal with LN2 temperatures well. Consider the heat capacity of LN2 (include the heat of vaporization) compared to that of H2O. For the complexity of what you propose to do, LN2 won't buy you much more than a good heat exchanger/radiator setup. Also, keep in mind that in an enclosed space (your mom's basement? ;-)) the nitrogen gas will displace air and asphyxiate the user if not properly ventilated. -- Paul Hovnanian ------------------------------------------------------------------ ASCII stupid question, get a stupid ANSI! |
#7
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Pumping Liquid Nitrogen
'Guy Macon' wrote, in part:
| I have been offered a small (about the size of a water | cooler) liquid nitrogen generator at an attractive | price. It generates four and a half liters per day, | using a gravity feed to keep a half liter dewar filled. _____ You could just Google a search string that includes [ overclocking CPU liquid Nitrogen ] and get over 94,000 hits. Most (if not all) these Rube Goldberg devices just build a tank around the CPU heatsink, fill the tank with liquid Nitrogen and let it boil off as it may. For actually pumping liquid nitrogen you could contact NASA for a few tips... especially safety tips. Taking a flyer with a Pentium III is hardly worth the effort. One possibility for a more or less continuously operating cooler would be to use the boil-off of liquid nitrogen to chill an anti-freeze mixture (propylene glycol & water ~ 50:50 should be good to below - 40) that you could then pump through a more or less stock CPU water block. Phil Weldon "Guy Macon" http://www.guymacon.com/ wrote in message ... | | | | | I want to pump the liquid nitrogen into a hole drilled | into the heatsinks of the CPU and GPU of a gaming PC | so I can overclock them farther than otherwise possible. | (This is for a a "just for fun" personal project, not | for work). | | My question is how best to pump the liquid nitrogen. | In the past I have worked with big dewars and let them | self-pressurize with a relief valve on top and a feed | tube going to the bottom -- sort of like an aerosol | can. This doesn't look feasible in this case; the back | pressure seems like it will back up the gravity feed. | I think I need a small pump that can take the cold and | not add too much heat to the liquid nitrogen. Any ideas? | | BTW, I have seven old 500 MHz. Pentium 3 systems that | are ready to be scrapped that I will be doing my | initial experiments on before deciding whether to | risk a more modern PC. | | -- | Guy Macon | http://www.guymacon.com/ | |
#8
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Pumping Liquid Nitrogen
Guy Macon wrote:
I have been offered a small (about the size of a water cooler) liquid nitrogen generator at an attractive price. It generates four and a half liters per day, using a gravity feed to keep a half liter dewar filled. I want to pump the liquid nitrogen into a hole drilled into the heatsinks of the CPU and GPU of a gaming PC so I can overclock them farther than otherwise possible. (This is for a a "just for fun" personal project, not for work). My question is how best to pump the liquid nitrogen. In the past I have worked with big dewars and let them self-pressurize with a relief valve on top and a feed tube going to the bottom -- sort of like an aerosol can. This doesn't look feasible in this case; the back pressure seems like it will back up the gravity feed. I think I need a small pump that can take the cold and not add too much heat to the liquid nitrogen. Any ideas? BTW, I have seven old 500 MHz. Pentium 3 systems that are ready to be scrapped that I will be doing my initial experiments on before deciding whether to risk a more modern PC. There is a whole forum devoted to LN2 and dry ice here. Maybe someone here will have an answer. http://www.xtremesystems.org/forums/...play.php?f=156 Paul |
#9
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Pumping Liquid Nitrogen
On Dec 19, 7:27 pm, Guy Macon http://www.guymacon.com/ wrote:
I have been offered a small (about the size of a water cooler) liquid nitrogen generator at an attractive price. It generates four and a half liters per day, using a gravity feed to keep a half liter dewar filled. I want to pump the liquid nitrogen into a hole drilled into the heatsinks of the CPU and GPU of a gaming PC so I can overclock them farther than otherwise possible. (This is for a a "just for fun" personal project, not for work). My question is how best to pump the liquid nitrogen. In the past I have worked with big dewars and let them self-pressurize with a relief valve on top and a feed tube going to the bottom -- sort of like an aerosol can. This doesn't look feasible in this case; the back pressure seems like it will back up the gravity feed. I think I need a small pump that can take the cold and not add too much heat to the liquid nitrogen. Any ideas? BTW, I have seven old 500 MHz. Pentium 3 systems that are ready to be scrapped that I will be doing my initial experiments on before deciding whether to risk a more modern PC. -- Guy Macon http://www.guymacon.com/ That's wonderful; how are you going to deal with frost? Where's this water gonna go when it melts? |
#10
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Pumping Liquid Nitrogen
On Dec 19, 4:27 pm, Guy Macon http://www.guymacon.com/ wrote:
I have been offered a small (about the size of a water cooler) liquid nitrogen generator at an attractive price. It generates four and a half liters per day, using a gravity feed to keep a half liter dewar filled. I want to pump the liquid nitrogen into a hole drilled into the heatsinks of the CPU and GPU of a gaming PC so I can overclock them farther than otherwise possible. (This is for a a "just for fun" personal project, not for work). My question is how best to pump the liquid nitrogen. You can use a simple piston pump for the actual pumping. The motor should be connected via a very long non conducting rod. The construction of the pump can use Teflon parts where things need to slide and silicone parts where a little springiness is needed. The idea, however is quite insane. The thermal stress will break things in the computer. In the past I have worked with big dewars and let them self-pressurize with a relief valve on top and a feed tube going to the bottom -- sort of like an aerosol can. This doesn't look feasible in this case; the back pressure seems like it will back up the gravity feed. I think I need a small pump that can take the cold and not add too much heat to the liquid nitrogen. Any ideas? BTW, I have seven old 500 MHz. Pentium 3 systems that are ready to be scrapped that I will be doing my initial experiments on before deciding whether to risk a more modern PC. -- Guy Macon http://www.guymacon.com/ |
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