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Do water chillers work? - Page 3

post #21 of 48
just a note duckieHo, your post average based on 25 months active on the forum works out to be 1.36233552631 posts per hour. (almost need super pi to work that one out)
WOW!!!
    
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post #22 of 48
Quote:
Originally Posted by Russtynailz View Post
just a note duckieHo, your post average based on 25 months active on the forum works out to be 1.36233552631 posts per hour. (almost need super pi to work that one out)
WOW!!!
HA HA.... I owe that to lots of unstructured time at work.
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post #23 of 48
Quote:
Originally Posted by DuckieHo View Post
Thanks for the input!

Is cool capacity equal to (target temperature - load temperature)?


What is the efficency of a phase cooling? Watts in vs watts removed?
Cooling capacity is just the thermal power a device can move. Water radiators that are dissipating 300W power have a capacity of 300W (at those conditions). A chiller that can move 300W power has a capacity of 300W at those conditions.

The efficiency of a vapor compression system is a very strong function of the difference in temperatures, but it's usually expressed as a COP (Coefficient of Performance) which is (power moved)/(power consumed). For the temperature range of a chiller, the COP should be between 1 and 3 i.e. the chiller moves more thermal power than it consumes in electrical power.

A PC cooling "phase" unit generally has a COP of 1 or lower.
A cascade phase unit is really inefficient like 0.1 to 0.5 i.e. they use between 10 times and 2 times the electrical power compared to the thermal power they move.
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post #24 of 48
Quote:
Originally Posted by Slider46 View Post
I think everyone above is talking about using the water chiller as the loop itself.

- This would definately not work.

However

If you used the water chiller as the reservior of a CPU loop - it could work. (not sure if the performance gained would be worth the cost though...)

Run the setup like this:

WaterChiller (as a reservior and also assuming it has it's own pump) > CPU block > Radiator (240mm) > Waterchiller/Res

You would be chilling ambient water below ambient - then moving it to the CPU where it would pick up heat and rise above ambient - then the water passes through the radiator which lowers back to *almost* ambient - then the water goes into the chiller lowering it back down below ambient.

The chiller would not be working too hard since it's only trying to chill ambient/slightly-above-ambient water.

It could work although a simple TEC waterchiller/res setup would be cheaper.
DONT. USE. A. RADIATOR. IN. THE. SAME. LOOP. AS. A. CHILLER.
once the chiller (this model DOES NOT HAVE A PUMP) brings the coolant below ambient temps (and it WILL), the radiator will only heat up the coolant. so dont use one at all... there are (practically) no DeltaT's in a closed watercooling loop, so order of components is irrelevant.
Phase systems have a COP of around 4 last time i checked... give or take a little. which means that this unit should be able to move 380*0.6*4=912W of heat, assuming the aforementioned 60% efficiency. PLENTY for a complete system, even a little overkill for just a CPU.
post #25 of 48
Quote:
Originally Posted by ChielScape View Post
DONT. USE. A. RADIATOR. IN. THE. SAME. LOOP. AS. A. CHILLER.
once the chiller (this model DOES NOT HAVE A PUMP) brings the coolant below ambient temps (and it WILL), the radiator will only heat up the coolant. so dont use one at all... there are (practically) no DeltaT's in a closed watercooling loop, so order of components is irrelevant.
Phase systems have a COP of around 4 last time i checked... give or take a little. which means that this unit should be able to move 380*0.6*4=912W of heat, assuming the aforementioned 60% efficiency. PLENTY for a complete system, even a little overkill for just a CPU.
With my suggestion, the water would already be carrying the heat from the CPU block to the radiator. The radiator would then dissipate that heat into the ambient air and then pass that *close-to-ambient* coolant into the chiller.

Like so:



Explain how the radiator heats up the coolant in this design...
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post #26 of 48
Quote:
Originally Posted by Slider46 View Post
With my suggestion, the water would already be carrying the heat from the CPU block to the radiator. The radiator would then dissipate that heat into the ambient air and then pass that *close-to-ambient* coolant into the chiller.

Like so:



Explain how the radiator heats up the coolant in this design...
like i told you before, the water coming out of the CPU block is half a freakin degree warmer than the water that goes in. i calculated that once. it was .6 degrees for a REALLY heavily OCd quad.
the water within the ENTIRE loop will be several degrees below ambient, maybe even below 0 if you run the chiller at 100%. the rad will just hurt. trust me.
post #27 of 48
They used to have a modified 1/3hp there for use as a comp water chiller. A lot of guys use the aquarium chillers for comp chillers.

I don't know what kind of temp's the 1/3 hp would give you, I'm sure if you look around you can figure it out. The higher the hp the colder it will be of course.

All you would need with that is a res and pump and block, you don't use a rad with a chiller, it will raise your temp's.

If you don't mind making things you can make a pretty good "slush-box" chiller out of a 5000BTU window AC or a 25 quart a day de-humidifier. All you do is put the AC evap in a ice chest thats full of anti-freeze, in the ice chest you have a Bonnie HC and your loop will pump through that HC and chill your coolant.
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post #28 of 48
Quote:
Originally Posted by ChielScape View Post
like i told you before, the water coming out of the CPU block is half a freakin degree warmer than the water that goes in. i calculated that once. it was .6 degrees for a REALLY heavily OCd quad.
the water within the ENTIRE loop will be several degrees below ambient, maybe even below 0 if you run the chiller at 100%. the rad will just hurt. trust me.
Calm down there buddy.....

Thanks for the clarification - I was not under the impression that the temperature difference in a loop would be that small. Apparently, since that is the case - I will agree and say that the rad would be counter-productive.
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post #29 of 48
didnt really post that with any hard feelings just emphasizing.
post #30 of 48
Thread Starter 
ya the waters moving fast enough that the loop stays almost the same temp throughout, and the radiator will only act as more "heated" surface area for the water to travel before it's chilled again.
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