(Updated w/ pics) Watercooled Rack of Servers - 50% completed - page 2.

ciuciu

donator

Activity: 588

Merit: 500

I'm doing exactly what you said.
I lost a card a few months ago to condensation. I wasn't home and the Internet went out. The cards got very cold and condensation happened. The lost card was using an XSPC block, all EKs were OK. For this I try to no longer use XSPC, they sure have a condensation problem.

Quote from: DeathAndTaxes on April 28, 2012, 12:47:23 AM

Quote from: cmg5461 on April 27, 2012, 11:54:12 PM

Quote from: ciuciu on April 27, 2012, 10:18:36 PM

It comes from the river, it goes to the river. I believe is better than to run the air conditioner non-stop.

Quote from: yxt on April 27, 2012, 09:23:28 PM

brilliant idea, really Roll Eyes

Quote

According to Nature (2010), about 80% of the world's population (5.6 billion in 2011) live in areas with threats to water security.

How do you deal with the condensation? Faucet water is much colder than ambient temps

I am not saying he is doing this but with a heat exchanger you can make the GPU loop any temp you want. Keep GPU loop's flow fixed and adjust the cold side loop (the cold water -> heat exchanger -> drain) flow so that it pulls enough heat from the hot side (GPU loop) to cool it down but keep it above ambient.

twoBitBasher

member

Activity: 85

Merit: 10

he still needs pump and reservoir, just not radiator as the heat exchanger is the "radiator"

ssateneth

legendary

Activity: 1344

Merit: 1004

I'm super jelly that he can just use fresh cold tap water to cool everything instead of us normal people that need to screw around with a radiator, a pump, and a reservoir. Must be soooooo nice having free water. Dont even need air conditioning! All the heat goes down the drain!

DeathAndTaxes

donator

Activity: 1218

Merit: 1079

Gerald Davis

Quote from: cmg5461 on April 27, 2012, 11:54:12 PM

Quote from: ciuciu on April 27, 2012, 10:18:36 PM

It comes from the river, it goes to the river. I believe is better than to run the air conditioner non-stop.

Quote from: yxt on April 27, 2012, 09:23:28 PM

brilliant idea, really Roll Eyes

Quote

According to Nature (2010), about 80% of the world's population (5.6 billion in 2011) live in areas with threats to water security.

How do you deal with the condensation? Faucet water is much colder than ambient temps

I am not saying he is doing this but with a heat exchanger you can make the GPU loop any temp you want. Keep GPU loop's flow fixed and adjust the cold side loop (the cold water -> heat exchanger -> drain) flow so that it pulls enough heat from the hot side (GPU loop) to cool it down but keep it above ambient.

cmg5461

sr. member

Activity: 369

Merit: 250

Quote from: ciuciu on April 27, 2012, 10:18:36 PM

It comes from the river, it goes to the river. I believe is better than to run the air conditioner non-stop.

Quote from: yxt on April 27, 2012, 09:23:28 PM

brilliant idea, really Roll Eyes

Quote

According to Nature (2010), about 80% of the world's population (5.6 billion in 2011) live in areas with threats to water security.

How do you deal with the condensation? Faucet water is much colder than ambient temps

ciuciu

donator

Activity: 588

Merit: 500

It comes from the river, it goes to the river. I believe is better than to run the air conditioner non-stop.

Quote from: yxt on April 27, 2012, 09:23:28 PM

brilliant idea, really Roll Eyes

Quote

According to Nature (2010), about 80% of the world's population (5.6 billion in 2011) live in areas with threats to water security.

yxt

legendary

Activity: 3528

Merit: 1116

brilliant idea, really Roll Eyes

Quote

According to Nature (2010), about 80% of the world's population (5.6 billion in 2011) live in areas with threats to water security.

ciuciu

donator

Activity: 588

Merit: 500

Yes, luckily I have free water.

Quote from: DeathAndTaxes on April 27, 2012, 08:15:39 PM

Quote from: ciuciu on April 27, 2012, 08:08:25 PM

Yes, I do.

Quote from: twoBitBasher on April 27, 2012, 07:53:06 PM

You just run the tap water all the time? Shocked

I guess you have free (or flat rate) water?

DeathAndTaxes

donator

Activity: 1218

Merit: 1079

Gerald Davis

Quote from: ciuciu on April 27, 2012, 08:08:25 PM

Yes, I do.

Quote from: twoBitBasher on April 27, 2012, 07:53:06 PM

You just run the tap water all the time? Shocked

I guess you have free (or flat rate) water?

ciuciu

donator

Activity: 588

Merit: 500

Yes, I do.

Quote from: twoBitBasher on April 27, 2012, 07:53:06 PM

You just run the tap water all the time? Shocked

twoBitBasher

member

Activity: 85

Merit: 10

You just run the tap water all the time? Shocked

ciuciu

donator

Activity: 588

Merit: 500

Just cold water. Here is a pic:
www.mycpu.ca/Ebay/IMG_4327.JPG

Quote from: seriouscoin on April 27, 2012, 11:40:16 AM

Quote from: ciuciu on April 26, 2012, 01:30:34 PM

Hi,
I have a similar setup, with 12 cards (9 5970 and 4 5870) working flowlessly for about 1 year. The diferrence is that I ran them in series. I'm using a Koolance heat exchanger connected to the cold water line. Will soon add 5 more cards.

Just to clarify Ciuciu, is your exchanger right b4 the water heater? (preheating) or you just use cold line to cool the loop?

notme

legendary

Activity: 1904

Merit: 1002

Quote from: ?? on ??

Quote from: notme on April 27, 2012, 01:19:21 AM

Please enlighten me on this simple theory. Why does the resistance not cause more pressure on one side when the fluid is being pumped through a restriction? Surely you can explain such a simple theory to someone with a degree in math from an engineering school.

I'm sorry i didnt know its the forum tradition to flash your degree when there is an argument. What is an engineering school btw? is it a school that teaches engineers?

You understand the differences of pressure loss and negative pressure? Can you tell me what is a negative pressure?

I told you I didn't know and ask you to teach me. Instead you just act like an ass. Good job. I wasn't flashing my degree, just trying to show I have the ability to understand so you won't be wasting your time. But whatever, now that I know positive pressure vs. negative pressure is not the same as high pressure vs. low pressure I can probably do my own research. Way to turn a simple misunderstanding of terminology into a "You're such an idiot" post. Ass.

cmg5461

sr. member

Activity: 369

Merit: 250

Quote from: seriouscoin on April 27, 2012, 01:32:31 PM

Quote from: cmg5461 on April 27, 2012, 12:55:11 PM

Quote from: ?? on ??

Good now we're on the same page. Now you understand why its wrong to say " negative and positive pressure" on either side of the waterblock.

The poster i originally responded to already clarified his loop has non full reservoir. As for "complex equation" you can bet i dont need it.

Ah ok. I thought the debate was about negative pressure in the whole system o.o

It was, i assumed the system without reservoir. However, mr degree flasher came in with a silly talk.

If you want to create a negative sealed system, you have to heat up the liquid (say 50c) prior sealing. The inline pump inside the loop cant pressurize the loop itself.

or use an overflow valve after stress testing your cards Cheesy

seriouscoin

hero member

Activity: 658

Merit: 500

Quote from: cmg5461 on April 27, 2012, 12:55:11 PM

Quote from: ?? on ??

Good now we're on the same page. Now you understand why its wrong to say " negative and positive pressure" on either side of the waterblock.

The poster i originally responded to already clarified his loop has non full reservoir. As for "complex equation" you can bet i dont need it.

Ah ok. I thought the debate was about negative pressure in the whole system o.o

It was, i assumed the system without reservoir. However, mr degree flasher came in with a silly talk.

If you want to create a negative sealed system, you have to heat up the liquid (say 50c) prior sealing. The inline pump inside the loop cant pressurize the loop itself.

cmg5461

sr. member

Activity: 369

Merit: 250

Quote from: ?? on ??

Good now we're on the same page. Now you understand why its wrong to say " negative and positive pressure" on either side of the waterblock.

The poster i originally responded to already clarified his loop has non full reservoir. As for "complex equation" you can bet i dont need it.

Ah ok. I thought the debate was about negative pressure in the whole system o.o

seriouscoin

hero member

Activity: 658

Merit: 500

Quote from: ciuciu on April 26, 2012, 01:30:34 PM

Hi,
I have a similar setup, with 12 cards (9 5970 and 4 5870) working flowlessly for about 1 year. The diferrence is that I ran them in series. I'm using a Koolance heat exchanger connected to the cold water line. Will soon add 5 more cards.

Just to clarify Ciuciu, is your exchanger right b4 the water heater? (preheating) or you just use cold line to cool the loop?

seriouscoin

hero member

Activity: 658

Merit: 500

Amazing temp ! Now i'm tempted to do mine. With multiple exchangers, i cant wait to see how it works out.

Quote from: ciuciu on April 27, 2012, 11:30:09 AM

I use no radiator.

Quote from: ?? on ??

Gotcha.
What do you use for the radiator?

Quote from: ciuciu on April 27, 2012, 10:52:52 AM

The cards are in series. I have only one heat exchanger.
http://koolance.com/index.php?route=product/product&path=54_119&product_id=944

Quote from: ?? on ??

Quote from: ciuciu on April 26, 2012, 01:30:34 PM

Hi,
I have a similar setup, with 12 cards (9 5970 and 4 5870) working flowlessly for about 1 year. The diferrence is that I ran them in series. I'm using a Koolance heat exchanger connected to the cold water line. Will soon add 5 more cards.

Running those plate exchangers in series? or the GPU block?

Because the former would ABSOLUTELY kill the pressure. I dont think thats good for the water heater at all.

I'm cheap so i will try to make those exchanger myselft.. Tongue

yeah i know. Its the same parallel channels design. But i'm thinking of having at least 5 of them in parallel loops.

ciuciu

donator

Activity: 588

Merit: 500

I use no radiator.

Quote from: ?? on ??

Gotcha.
What do you use for the radiator?

Quote from: ciuciu on April 27, 2012, 10:52:52 AM

The cards are in series. I have only one heat exchanger.
http://koolance.com/index.php?route=product/product&path=54_119&product_id=944

Quote from: ?? on ??

Quote from: ciuciu on April 26, 2012, 01:30:34 PM

Hi,
I have a similar setup, with 12 cards (9 5970 and 4 5870) working flowlessly for about 1 year. The diferrence is that I ran them in series. I'm using a Koolance heat exchanger connected to the cold water line. Will soon add 5 more cards.

Running those plate exchangers in series? or the GPU block?

Because the former would ABSOLUTELY kill the pressure. I dont think thats good for the water heater at all.

I'm cheap so i will try to make those exchanger myselft.. Tongue

yeah i know. Its the same parallel channels design. But i'm thinking of having at least 5 of them in parallel loops.

cmg5461

sr. member

Activity: 369

Merit: 250

Quote from: ?? on ??

Quote from: cmg5461 on April 27, 2012, 10:58:28 AM

Quote from: ?? on ??

When a high pressure and low pressure area being connected, the system will equalize itself by the fluid flow from one to another.

Negative or positive pressure doesnt mean low or high pressure.

"The term "negative pressure" is used in physics and engineering to refer to a situation in which an enclosed area has lower pressure than the area around it. Any compromise in the divide between the area of negative pressure and the more highly pressurized area around it would cause substances to flow into the area of negative pressure."

Please, humor me.

Is your waterblock an enclosed area?

It is not, however, you cannot simplify a liquid cooling system into a closed loop. The reservoir contains a less dense fluid, "air" which compresses with less energy than the water. This allows for a vibration model to be made due to the pauses in rotation by the induction pump. (4 per 2 radians?) This creates a dampened oscillation, reinforced by the motor. In turn there is a negative pressure in the reservoir with respect to the pump.

This can be solved by a long and complex differential equation, which I really don't feel like doing.

For more information on this, look up Bernoulli's principle

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