No wonder, Avalon sounds like a Jet taking off at full Fan RPMs
Topic: Avalon Water Cooling - page 5. (Read 13967 times)
No wonder, Avalon sounds like a Jet taking off at full Fan RPMs
Space shuttle was technically liquid cooled. If I recall correctly the nozzles were cooled with cryogenic hydrogen that was expanded in tubes surrounding the combustion chambers and nozzles. This expanded hydrogen was then used to drive the oxygen and hydrogen turbopumps that fed the main engine. The wikipedia article has some neat details of how the system worked -> http://en.wikipedia.org/wiki/Space_Shuttle_Main_Engine. For reference, each hydrogen turbo pump was around 70,000 horsepower per engine.
My fail. 
Space shuttle was technically liquid cooled. If I recall correctly the nozzles were cooled with cryogenic hydrogen that was expanded in tubes surrounding the combustion chambers and nozzles. This expanded hydrogen was then used to drive the oxygen and hydrogen turbopumps that fed the main engine. The wikipedia article has some neat details of how the system worked -> http://en.wikipedia.org/wiki/Space_Shuttle_Main_Engine. For reference, each hydrogen turbo pump was around 70,000 horsepower per engine.
water always wins air hands down in terms of cooling efficiency and capacity. That's why engines are water and not air cooled (except for some low output exceptions, lawn mowers, mopeds, old VWs etc.)
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Yes, and that engine is one of those rather low output ones. Yes it is, huge displacement but very low specific output, especially at altitude at thin air.
and as you can see from the image it's still huge effort to cool it, look at all those fins!
I want to see you try cooling an small displacement inline-4 engine which outputs 2megawatts as waste heat with just air. Yes, megawatts. and no, that engine does not melt. Infact, runs very smooth and without serious heat issues.
Jeesh, joking on these boards is dangerous
And yes, i know .58 beats 0.024, Fact Cat agreez. water always wins air hands down in terms of cooling efficiency and capacity. That's why engines are water and not air cooled (except for some low output exceptions, lawn mowers, mopeds, old VWs etc.)
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Yes, and that engine is one of those rather low output ones. Yes it is, huge displacement but very low specific output, especially at altitude at thin air.
and as you can see from the image it's still huge effort to cool it, look at all those fins!
I want to see you try cooling an small displacement inline-4 engine which outputs 2megawatts as waste heat with just air. Yes, megawatts. and no, that engine does not melt. Infact, runs very smooth and without serious heat issues.
water always wins air hands down in terms of cooling efficiency and capacity. That's why engines are water and not air cooled (except for some low output exceptions, lawn mowers, mopeds, old VWs etc.)
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You might have considered this already, but unless you have an incredibly high rate of flow through that block, the inflow side is going to be substantially cooler than the outflow (as water snakes through your block, doing its thing & picking up heat). Might want to reconsider using the standard "sandwich" approach -- milling out the metal would take minutes, you already have access to an end mill, and if you're worried about leakage, go with 1/8" alum. plate instead of plastic, i've never had problems with leaking o-rings. What's good for a radiator is pretty lousy for a waterblock
I honestly don't think it is going to work all that well if you are just running straight "tubes" through the block. You are not going to get very much surface area covered with the water. The entire area that covers the chips should be covered in water.
water always wins air hands down in terms of cooling efficiency and capacity. That's why engines are water and not air cooled (except for some low output exceptions, lawn mowers, mopeds, old VWs etc.)
Infact, air is more like an insulator, you can infact use air as an insulator and has been used for ever since human learned to make clothing, and all animals with hair prior to that.
If you live in a cold climate your winter clothes are likely designed to hold in tiny pockets of air which works as insulator.
YES, air's heat conductivity and capacity is that tiny.
Why does it work for cooling them? Abundance.
As long as you circulate it and efficiently, it works quite well for cooling small loads, like CPUs etc.
Water is not cost effective solution for small loads due to the extra work needed, and little capacity required. Thus A/C + air works quite well.
But as soon as you venture into the kilowatt range in high density OR simply BIG setups, water suddenly becomes the best choice by far.
Infact, air is more like an insulator, you can infact use air as an insulator and has been used for ever since human learned to make clothing, and all animals with hair prior to that.
If you live in a cold climate your winter clothes are likely designed to hold in tiny pockets of air which works as insulator.
YES, air's heat conductivity and capacity is that tiny.
Why does it work for cooling them? Abundance.
As long as you circulate it and efficiently, it works quite well for cooling small loads, like CPUs etc.
Water is not cost effective solution for small loads due to the extra work needed, and little capacity required. Thus A/C + air works quite well.
But as soon as you venture into the kilowatt range in high density OR simply BIG setups, water suddenly becomes the best choice by far.
I was thinking about fixing the thermo probe on the board instead of the heatsink. Maybe I design myself some sheet metal bracket to directly clamp it on a chip over two of the M3 threads.
Also I haven't yet designed the cabinet I want to put in the whole setup. it would be nice if it where air tight and insulated so I can run temperatures below condensing point... that's a little tricky.
Thanks for the nice replies!
Also I haven't yet designed the cabinet I want to put in the whole setup. it would be nice if it where air tight and insulated so I can run temperatures below condensing point... that's a little tricky.
Thanks for the nice replies!
For what it's worth, lemme give you my encouragement and +1. If there hasn't been already, you're probably going to find postings that say "don't be an idiot; well designed air cooling always surpasses water cooling." Water cooling became the bastard child of computers when the big iron mainframes gave way to the VAX and other minis in the late 70's, and has been that way ever since.
But when stuff has to run in less than pristine conditions, like non-air-conditioned locales, or high dust environments, water always has had its place, regardless of what they teach in school.
Good luck.
But when stuff has to run in less than pristine conditions, like non-air-conditioned locales, or high dust environments, water always has had its place, regardless of what they teach in school.
Good luck.
I'm very interested in this project, I 'll definitely switch to water cooling and use a chiller. I'm living in a hot place and my unit restarts every time it surpasses 46°C, the heat is very bad.. it reduces productivity and shortens the lifetime of the chips. Also the noise of the fans is very annoying.
BTW, I would suggest making at least 1 hole for placing the temperature sensor that every Avalon has:
Doing this, you'll need to use a waterproof temp sensor like this one:
http://www.ebay.com/itm/2pcs-10K-1-NTC-1meter-Thermistor-Temperature-Temp-Sensor-Waterproof-arduino-/121005378819?pt=US_Weather_Meters&hash=item1c2c7b8d03
Also note that the Avalon came with only 1 sensor and each unit itself allows you up to 2 sensors:
BTW, I would suggest making at least 1 hole for placing the temperature sensor that every Avalon has:
Doing this, you'll need to use a waterproof temp sensor like this one:
http://www.ebay.com/itm/2pcs-10K-1-NTC-1meter-Thermistor-Temperature-Temp-Sensor-Waterproof-arduino-/121005378819?pt=US_Weather_Meters&hash=item1c2c7b8d03
Also note that the Avalon came with only 1 sensor and each unit itself allows you up to 2 sensors:
you are aware that yifu published their heatsink in dxf format on github?
el_rlee: Thanks for your work!
We didnt receive our avalons yet, so i was able to finish the Qcool element with your measurements.
https://bitcointalksearch.org/topic/m.2259881
We didnt receive our avalons yet, so i was able to finish the Qcool element with your measurements.
https://bitcointalksearch.org/topic/m.2259881
fantasying about putting the whole setup on the balcony...
Or you could put only the chiller outside to keep your mining gear safe (to cuttle pivately) and heat out.
Very cool cooler!!
Tag.
Nice work, looking forward to seeing the results of using this versus the stock heatsink!
Nice work, looking forward to seeing the results of using this versus the stock heatsink!
What's the material you used for this water block?
Is the hole 1/4' standard?
What kind of water channel inside?
I believe a normal water cooling system is enough.
Is the hole 1/4' standard?
What kind of water channel inside?
I believe a normal water cooling system is enough.
Aluminium
Yes, straight 1/4 inch (for flat sealing)
Round
How would that differ?
I guess I would need pretty big radiators for passive cooling, and the chiller I posted is not expensive. Also it's set value can be adjusted up to 40 degree - than it shouldn't use so much electricity any more. I'm still fantasying about putting the whole setup on the balcony...
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