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Danny_75

Danny_75

Danny_75

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19 Oct 2009
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Need a little advise from the people in the know,

Right this is going to be hard work to explain but will try.
As you prob can see i use chilled water to cool the CPU, Its a Fridge type compressor which in turn cools a tank of water(stock CPU will get -9c). Inside the tank of chilled water is a copper pipe through witch i pump my coolant for the CPU.

We all clear so far :)

Right this is the BIG Q.
A: Do i add the GPU into the CPUs coolant supply?
B: If you choose A do i put it before the CPU or after ?
C: I have the option to pump the water that's in the tank (The water i chill to cool the copper pipe which carries the CPU coolant)

No matter what i pick i think its going to have an adverse effect.
If i use the CPUs coolant that will ether steal cold water from the CPU or warm the water up for the CPU.
If i use the coolant tanks water that will cause the water to warm up in turn causing the CPUs coolant supply to warm..

What do you think you would choose?
 
Run 2 seperate loops through the chilled tank of water, its going to take more cooling but it'll keep your CPU loop the same, may make the compressor work harder to cool the tank though.
 
Id put the CPU first and then the GPU, try it and see how much of a temp increase you get, if its too high then maybe put 2 pipes through the chilled water?
 
Is it the 5970 you have in mind? If so it's rated at putting out just shy of 300W of heat. That'll be very close to what your processor puts out. However you arrange the pipes, you're dumping another 300W into the water the chiller is trying to keep cold.

How much time does the compressor spend running at the moment when under full cpu load? If it's significantly less than 50% of the time and it's rated for 24/7 operation you'll be fine. If it's running all the time now, then I believe there are problems related to saturation with compressors and it may all go very wrong.
 
The compressor kicks in after about ?? 35 mins then trips of about 2 hours after the PC.
Iam sure i have a 2 big of a res.Thinking might go down to 1L.
If the res doesnt help will just get a bigger compressor fitted.
 
Increasing/decreasing res size will do next-to-nothing except alter the time taken to reach equilibrium, which is only useful if your PC is not on 24/7.
 
Thinking bigger cooler then..... MMmmmm bugger!


This is a duel line cooler,they do tripple might sell this and just invest... Thats all i do atm didnt want to spend anymore.
 
(Note: I'm no water cooling expert, so this may be ********)

Put the compressor just before the CPU+GPU.

It might not necessarily make a lot of difference, but I'd rather have warm water in the reservoir cooling down slightly than cold water warming up to room temperature. I've not messed about much with water cooling, but in theory it should help a little.

The general wisdom is indeed that it makes no difference, but that's with passive cooling (radiators) rather than your active cooling (compressor) which is actually bringing water temperature down rather than just allowing it to drop.

Do you only use the compressor? If so, why not try putting a radiator into the loop too, to bring the water down towards room temperature and give the compressor a little less work to do.
 
What model compressor are you using and refrigerant.

Problem with upping the compressor size you will most probably need to increase the condenser size, is this air cooled or passive.

Majority of compressor should be able to run 24/7 without problem.
 
Ah. So it runs all the time the computer is on? That suggests to me that its running at capacity, and adding further heat load will make things very hot and kill your chiller. Probably not in any terribly exciting way, but I'm new to researching refrigeration so am a bit unsure of myself here. It might explode on you, or it might labour on forever, but I think it'll burn out.

By far the most sensible answer is to leave the processor as it is, and get the graphics card on normal watercooling. If you want chilled water on both, I'd suggest getting another one of the things you've got now.

@Audigex changing loop order around is good for less than a degree centigrade, and putting a radiator in a chilled loop will lead to the radiator cheerfully dumping heat into the chilled water. Otherwise all good :p

RJC is just the chap though, what happens if you run a compressor significantly beyond the heat load it can deal with? I'm reasoning that the air-coolant delta it maintains approaches zero, after which the compressor dies. Be interesting to know if it just starts running the coolant above ambient instead.

edit: on second thoughts, as the system relies on compressing a gas to liquid then allowing it to expand wherever you want to be cooler, would the limit be when the gas is too hot to liquefy using your compressor?
 
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The compressor will always compress the super heated suction vapour to a highly super heated vapor so you will always maintain a delta t between ambient and condensing pressure / temperature and produce a sub cooled liquid.

If you run the system with a high heat load it will be hard without monitoring the system whats going to happen it may run the cooling medium at a higher temp of around 7 -8c without problem, but at 30c you probably be in trouble.

The compressor may fail in different ways, the compressor may grind to a halt due to high head pressure but it wont explode or the motor will burn out overtime.

Sorry I have explained very well :p
 
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The compresser is a ZMC EGL90 TB running 134a Cant see what HP it is the fan and conden is in the way.

Just been looking over the bay,there are a few things i could mod but thinking bigger rig. Dont want to go back to normal water. Might turn the CPU down and test for the day. @stock speeds the water res will frezze soild,so thinking take it down to 4/4.2 GHZ that will save loads of Volts = less heat.

lol computers are ment to make life easy :)
 
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