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Old 06-17-2012, 10:34 AM   #1
skyguynca
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phase change cooling water questions

I see the posts on what temperatures you are getting at your blocks loaded and unloaded.

What kind of temps are you seeing on the coolant returning to your evap's ?

How much temperature (estimate or average) is the evap's pulling down?

Thanks for the info

David
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Old 06-17-2012, 09:43 PM   #2
Drewmeister
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The supply and return temps will be nearly the same. The temp range will depend on the chiller's performance curve. That is the relationship between the cooling capacity and output temperature.

Obviously you're not going to find that info for an a/c chiller conversion. I can give you a close approximation for a 5k btu r22 a/c chiller. Those can do around 600w@0c or close to 200w@-20c. A larger a/c will have more capacity at any given temp. Performance with a 600w load might be closer to -20c with a larger 12k btu unit. This is for off the shelf units... fully modded would be much colder.
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Old 06-18-2012, 01:56 AM   #3
skyguynca
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i guess i phrased it wrong. what i am wondering is the temerature of the water/coolant when it returns verses when it heads to the cooling blocks on the cpu? how much heat it absorbs? i know it varies alot between systems but i am trying to get a idea as to how much the cooler/evap has to chill the returning water.
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Old 06-18-2012, 10:29 PM   #4
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The temp difference will be fractional due to the high specific heat capacity of water. The heating of the liquid is more of a gradual process over time. It would take a huge influx of energy or extremely low flowrate to change it even 1c. To give an example.. my rig at 580w will have a delta-T of far less than .5c.

The min amount of cooling required for my rig is 580w x 3.412btu = 1979btu/hr. That means the chiller must have at least 1979btu of capacity at the temp I want to operate at. Just estimate your heat load and calculate the btu/hr of cooling required. Quad + sli/cf 600-800w. Then match a chiller to handle that at the temp you desire. Normally you add around 20% for headroom.
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Old 06-18-2012, 11:07 PM   #5
skyguynca
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Perfect, thanks
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