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Few WC questions

post #1 of 5
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So i was asleep, and when i sleep i usually think more clearly then when im awake, and i actually had a dream about WC questions.

1) If a rad cools the water after it is heated, and the rad is cooled by air being pushed through it, why doesnt the water turn room temp after a while?
2) Could you submerge your rad in icy water or a freezer instead of putting fans on it?
3) Why do people buy HUGE rads that are the size of planets if their water can only be cooled to 32F (or room temp) anyway, wouldnt a smaller rad be able to accomplish the same thng as a larger assuming its large enough to handle all the heat, why go oversize if waterr wont get colder than it can?
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post #2 of 5
1) If a rad cools the water after it is heated, and the rad is cooled by air being pushed through it, why doesnt the water turn room temp after a while?

Traditional water cooling is always above ambient, otherwise you have to account for condensation.

2) Could you submerge your rad in icy water or a freezer instead of putting fans on it?

Yes there are multiple ways to go about this but you have to account for condensation and the massive drain the heat puts on whatever you have cooling the water/freezer.(freezers will break if you put a constant source of heat inside them)

3) Why do people buy HUGE rads that are the size of planets if their water can only be cooled to 32F (or room temp) anyway, wouldnt a smaller rad be able to accomplish the same thng as a larger assuming its large enough to handle all the heat, why go oversize if waterr wont get colder than it can?

The more surface area in the rads fins, the more heat dissipation it has, and if you haven't noticed yet ocn is a place for perfectionists for the most part.

EDIT: im no watercooling expert so take this with a grain of salt
Edited by wildfire99 - 8/21/11 at 11:28am
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post #3 of 5
Thread Starter 
Quote:
Originally Posted by wildfire99 View Post
1) If a rad cools the water after it is heated, and the rad is cooled by air being pushed through it, why doesnt the water turn room temp after a while?

Traditional water cooling is always above ambient, otherwise you have to account for condensation.

2) Could you submerge your rad in icy water or a freezer instead of putting fans on it?

Yes there are multiple ways to go about this but you have to account for condensation and the massive drain the heat puts on whatever you have cooling the water/freezer.(freezers will break if you put a constant source of heat inside them)

3) Why do people buy HUGE rads that are the size of planets if their water can only be cooled to 32F (or room temp) anyway, wouldnt a smaller rad be able to accomplish the same thng as a larger assuming its large enough to handle all the heat, why go oversize if waterr wont get colder than it can?

The more surface area in the rads fins, the more heat dissipation it has, and if you haven't noticed yet ocn is a place for perfectionists for the most part.
Why does the water stay above ambient? Do the rads dissapate enough heat to let it amintain some level of below amibency (is that a word)

Ah, i figured a freezer would do it, but it makes sense that it would not work for long. So if i dumped freezing cold water in a cooler, put a rad in there then changed water every few hours would that work?

Ya i know that more surface area means more heat dissapation, but its not linear, after a while adding more rads must not take away heat. It has to plateau somewhere.
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post #4 of 5
Quote:
Originally Posted by wildfire99 View Post
1) If a rad cools the water after it is heated, and the rad is cooled by air being pushed through it, why doesnt the water turn room temp after a while?

Traditional water cooling is always above ambient, otherwise you have to account for condensation.
You can get darn close. If you have power saving features turned on, your CPU only puts out a few watt of heat on idle. As to why to water doesn't return to room temp, because there is always heat being dumped into the water.

That being said coolant water doesn't change much in temp to start with, as water has a HUGE heat capacity.

For example. To raise 1 gram of water 1C in temp takes 4.18 Joules of energy. Now, my i7-950 @stock idle with power saving on only generates around 10W or so of heat. Now a Watt is a measure of energy transfer specifically Joules per second. So if my CPU needs to vent 10J/second of energy and to raise a gram of water 1C in temp takes 4.18J...do the math for how long it takes. Now I have about 1L of water in my loop. As such the water at idle very seldom gets far away from room temp-even with no fans blowing on my radiator.
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post #5 of 5
Thread Starter 
Quote:
Originally Posted by Skripka View Post
You can get darn close. If you have power saving features turned on, your CPU only puts out a few watt of heat on idle. As to why to water doesn't return to room temp, because there is always heat being dumped into the water.

That being said coolant water doesn't change much in temp to start with, as water has a HUGE heat capacity.

For example. To raise 1 gram of water 1C in temp takes 4.18 Joules of energy. Now, my i7-950 @stock idle with power saving on only generates around 10W or so of heat. Now a Watt is a measure of energy transfer specifically Joules per second. So if my CPU needs to vent 10J/second of energy and to raise a gram of water 1C in temp takes 4.18J...do the math for how long it takes. Now I have about 1L of water in my loop. As such the water at idle very seldom gets far away from room temp-even with no fans blowing on my radiator.
I guess i didnt realize how effecient water was at heat dissapation.
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