Liquid Cooling Temps

[GuyIncognito]

that assumption is only aimed at DELTA temps

otherwise the food in my fridge would go off - lol

EDIT:

in the temps we are getting in the UK's latest hot weather, i am getting 25-31C idle, and 39C(max) at load, using a coolit vantage [not a proper WC loop]. my current ambient is 15C. my current temp is 33.7C

???

A fridge much like a typical AC unit uses a compressor.

 

[GuyIncognito]

a vacuum lol

the reason why it APPEARS to be like this IS:

the air inside the fridge contracts as it cools, creating slightly less volume (psi)

http://home.howstuffworks.com/refrigerator2.htm

 

[GuyIncognito]

hang on... don't jump the gun here

the whole point of moving air through the radiators, uses one of the major laws of fluid dynamics.

moving fluids are colder than their static counterparts, because more energy is lost as more particles collide

therefore:: the air moving through the fans will always be cooler than the static air nearby

the static air is your ambient

to achieve optimum cool temps in a WC loop these criterias must be met:

• a fast flow
  
• a very low fluid viscousity
  
• use of a conductive fluid
  
• the best fluid cooling available
  

You shouldn't have jumped the gun.

Your loop is missing a compressor. You have a heat exchanger there, not necessarily a refrigerator.

http://en.wikipedia.org/wiki/Vapor-compression_refrigeration

 

[stevebarnes15]

i'm not phase change cooling though,so that doesn't really apply?,i just have a simple water cooling loop.

 

[KaraMurat]

This thread went from liquid cooling to how fridges work lol.

OT: It depends on the quality of components used (cpu block), pump (amount of water it pushes /pm), the rad, room temperature and so on...

You've just got to try and test to see the temps, however a drop of around 50% seems good, probably could be lower by tweaking a few things IDK that's the thing about WC.

 

[GuyIncognito]

i'm not phase change cooling though,so that doesn't really apply?,i just have a simple water cooling loop.

What dugdiamond has typed makes little sense to me. Moving water (or moving anything) actually produces friction which produces heat. If you stir a viscous fluid, you will produce heat:

http://en.wikipedia.org/wiki/Friction

 

[stevebarnes15]

I was thinking larger rad = cooler temps,wanted to see what everyone thought,and if anyone has tested this.

 

[sheroo]

hang on... don't jump the gun here

the whole point of moving air through the radiators, uses one of the major laws of fluid dynamics.

moving fluids are colder than their static counterparts, because more energy is lost as more particles collide

therefore:: the air moving through the fans will always be cooler than the static air nearby

the static air is your ambient

to achieve optimum cool temps in a WC loop these criterias must be met:

• a fast flow
  
• a very low fluid viscousity
  
• use of a conductive fluid
  
• the best fluid cooling available
  

OK so I found this old bit-tech article:-

"you can't expect to ever run below the ambient temperature of the room. At the end of the day, water is still forced-air cooling - it's just that the location has changed, and so has how much it can cool. The laws of thermodynamics prevent you from ever getting cooler than the coldest point of contact - and since that is ambient air, you cannot go lower than that."

http://www.bit-tech.net/hardware/cooling/2007/08/22/watercooling_101/1

 

[stevebarnes15]

Thats a good guide there,although,i don't know if it's 100% true.

If we use a fan in summer when hot for instance it cools us down significantly,dependant on the flow of air coming from the fan,now given that the cold air flowing over a rad is what dispells the heat from it,and the fact that metal retains it's cooleness for some time,then the more fans/rads you have the cooler the flowing water passing through will be as it travels through the fins.

For instance if i touch the back of my case where the air flows out of the rad,it's colder than ambient room temperature,so the only thing putting heat into my system is the cpu,and adding more fans/rads,would decrease the temperature surely,as more heat is dispelled from the system.

I'm finding most of the heat is being dispelled at the reservoir i have which is a cooling reservoir on the return to the pump,and that's actually warm to the touch,whereas my rad is cold with fans pushing air out.

I guess i'll have to test this one out by adding fans to the cooling reservoir,and see if it makes a difference or not.

the components i'm using are:

Laing DDC mcp335,18w pump,600lph,with an xspc top

Hardware Labs -Stealth GTS 120MM Rad

XSPC cooling reservoir 250mm

EK Supreme HF nickel plexi waterblock

I'm just using a standard 120mm fan from my phantom to cool the rad at present,with a 200mm top exhaust fan on case.and a 120mm intake on front of case.

 

[dugdiamond]

lol - i give up (face palm)

 

[stevebarnes15]

Adding an extra 140 mm fan blowing over cooling res has decreased cpu temp by 2 degrees down to 17 degrees from 19,and the fan is only a crappy thermaltake thing.

That was only in a short space of around 5 mins.

I ran prime for 30 mins along with folding@home,and max temp it achieved was 36 degrees.

 

[Pat123]

A fan blowing doesn't cool down the air. If anything it should heat it up, when particles collide they release energy which is mainly given off as heat meaning, a moving liquid is always going to be warmer than still liquid in the same environment, providing no other variables are present, though only slightly. The reason you feel cool when a fan blows air at you is because the moving air shifts the hotter air surrounding your body (because you have heated, it up meaning very little heat transfer is occurring) away allowing cooler air to speed up that heat transfer. This is called the wind chill effect. The temperature of your skin (or just above it) could never be cooler than the air around you (ambient). 'Everything' works towards equilibrium.

In this case the temperature of the water can NEVER be lower than ambient, you're lucky to even reach ambient as a 100% efficient transfer is difficult to achieve.

 

[GuyIncognito]

lol - i give up (face palm)

What is that supposed to mean? What you've written in this thread is utter nonsense.