Kazi
10-07-2008, 08:08 AM
Together with my brother we are building a liquidchiller with a concept added to it which we haven't seen on the forum anywhere yet.
It is build out an airthight box which is aircooled by an evaporator. The parts like cpu and videocard are cooled by an liquid chilled cicrulation system. To keep all liquid chilled components dry, the temperature of the airco-evaporator surface should stay beneath the temparture of the circulating liquid. This is done by putting both evaporator of the airco and waterchiller in serie, airco first. The liquidtemp is kept higher this way, due to the superheat and the dif. temperature of the liquid evaporator. This way you don't need an extra device to regulate both tempeartures.
http://img367.imageshack.us/img367/1870/image280bz6.jpg (http://imageshack.us)
Greatt benefit of this design is:
- No condensation.
- You can use standard watercooling parts. (some rubbers may need to be changed)
- It is easy to change your motherboard and videocard, CPU and etcertra
- All components inside the box are far below zero.
It is already running, but still have some smaller problems.
- To much sound of the compressor.
- to much pressure drop over the two evaporators, due to bad design or some blockage. At the moment when system is running under load, the diff. presure is 0.7 bar.
- expansion valve does not keep pressure and temp steady(fluctuating), probably caused by the above mentioned problem.
Some specs for phase change system:
5/8 hp compressor
expasion valve (smallest we could find at danfoss)
1000w nominal ECO condensor
home made airco evaporator (could not find any standard part)
home made liquid evaporator (to keep cost low)
Some specs for liquid system:
-Used liquid is Freezium 60 (pure)
-DDC-3.2 DC Pump Laing (customised for low temps -50 C)
-Some standard cheap innovatek cooling blocs.
-Swifttech reservoir
Some results system 1:
Motherboard: MSI 845PE MAX2 (MBM temps idle -7C, load -5C)
CPU: Northwood 2.4GHz @3.6GHz (MBM temps idle -12C, load -7C)
RAM: Kingston PC3200 512MB
Graphixcard: Geforce Ti4600 @357 (no mods)
Temps. - liquid -27 Celsius underload approx.
- airco evap surface temp -36
- suction pressure 1,3 bar (-42Cevap temp) superheat to -35
- temp between both evaps -37 Celsius
- pressure after expansion valve 1,9 bar, temp -31 Celsius
Some results system 2:
Motherboard: ASUS P4C800E-Deluxe (MBM temps idle -18C, load -15C)
CPU: Prescott 3.0GHz @3.8GHz (MBM temps idle -20C, load -13C)
RAM: Crucial Ballistix PC4000 2x 1024MB @stock
Graphixcard: Geforce Ti4600 @357MHz (no mods)
We could not get a higher OC, probably because of a FSB wall at 250Mhzof the motherboard.
Temps. - liquid -25 Celsius underload approx.
- airco evap surface temp ???
- suction pressure 1,8 bar (-34Cevap temp) superheat to -29
- temp between both evaps -34 Celsius
- pressure after expansion valve ??? bar, temp ??? Celsius
Both old systems, just for testing.
It is build out an airthight box which is aircooled by an evaporator. The parts like cpu and videocard are cooled by an liquid chilled cicrulation system. To keep all liquid chilled components dry, the temperature of the airco-evaporator surface should stay beneath the temparture of the circulating liquid. This is done by putting both evaporator of the airco and waterchiller in serie, airco first. The liquidtemp is kept higher this way, due to the superheat and the dif. temperature of the liquid evaporator. This way you don't need an extra device to regulate both tempeartures.
http://img367.imageshack.us/img367/1870/image280bz6.jpg (http://imageshack.us)
Greatt benefit of this design is:
- No condensation.
- You can use standard watercooling parts. (some rubbers may need to be changed)
- It is easy to change your motherboard and videocard, CPU and etcertra
- All components inside the box are far below zero.
It is already running, but still have some smaller problems.
- To much sound of the compressor.
- to much pressure drop over the two evaporators, due to bad design or some blockage. At the moment when system is running under load, the diff. presure is 0.7 bar.
- expansion valve does not keep pressure and temp steady(fluctuating), probably caused by the above mentioned problem.
Some specs for phase change system:
5/8 hp compressor
expasion valve (smallest we could find at danfoss)
1000w nominal ECO condensor
home made airco evaporator (could not find any standard part)
home made liquid evaporator (to keep cost low)
Some specs for liquid system:
-Used liquid is Freezium 60 (pure)
-DDC-3.2 DC Pump Laing (customised for low temps -50 C)
-Some standard cheap innovatek cooling blocs.
-Swifttech reservoir
Some results system 1:
Motherboard: MSI 845PE MAX2 (MBM temps idle -7C, load -5C)
CPU: Northwood 2.4GHz @3.6GHz (MBM temps idle -12C, load -7C)
RAM: Kingston PC3200 512MB
Graphixcard: Geforce Ti4600 @357 (no mods)
Temps. - liquid -27 Celsius underload approx.
- airco evap surface temp -36
- suction pressure 1,3 bar (-42Cevap temp) superheat to -35
- temp between both evaps -37 Celsius
- pressure after expansion valve 1,9 bar, temp -31 Celsius
Some results system 2:
Motherboard: ASUS P4C800E-Deluxe (MBM temps idle -18C, load -15C)
CPU: Prescott 3.0GHz @3.8GHz (MBM temps idle -20C, load -13C)
RAM: Crucial Ballistix PC4000 2x 1024MB @stock
Graphixcard: Geforce Ti4600 @357MHz (no mods)
We could not get a higher OC, probably because of a FSB wall at 250Mhzof the motherboard.
Temps. - liquid -25 Celsius underload approx.
- airco evap surface temp ???
- suction pressure 1,8 bar (-34Cevap temp) superheat to -29
- temp between both evaps -34 Celsius
- pressure after expansion valve ??? bar, temp ??? Celsius
Both old systems, just for testing.