Phase Build: X_Man’s Mach II GT
08.06.07 - 04:48pm
During the end of July I began a run of three phase-change builds for customers ranging from Atlanta to San Francisco. This is the first of them, it is a Prometeia Mach II GT modified to hold a quad-core load. I post all my builds over at XtremeSystems so this will be a crude copy/paste. Hope you like what you see, took a lot of time on this build with the cramped case.
Compressor: Danfoss NF9FX
Condenser: Chilly1 single-stage blue shroud, 120vac fan.
Filter/Dryer: Supco SUD111
Metering Device: 8′4″ of 0.031″ capillary tubing
Evaporator: Chilly1 2007 evaporator + mount
Misc: Suction Line Accumulator with ~4′ of captube wrapped
Charge: R22
Target Range: Maximum of 300w but still capable of running in the 1XXw range, tuned for 14 degrees of superheat at 225w.
Observations: Power consumption per watt removed with R22 compared with R507 was astounding, the high discharge pressures of R507 coupled with hot ambients (33 celsius) stressed the compressor considerably. The sweetspot on this build was in the 225-250w range.
Performance: Measured utilizing the Mach II GT controller temperature probe attached to the evaporator. I had no Q6600 to test realworld performance with(waiting on a G0) but I dummyloaded it from 0w to 300w with a 6-wirebound resistor load with .5″ x 1.5″ x 1.5″ coldplate. Dummyload was insulated on the bottom and 3 sides, un-insulated side has 4 bore-holes used to measure temps across the coldplate. Ceramique makes contact between the resistors and the coldplate and AS5 was used between the evap and coldplate (ran out of ceramique last week )
Load/Temp
000w/-58C 065w/-48C
130w/-44C 180w/-40C
200w/-38C 250w/-34C
275w/-32C 300w/-27C
Conclusion: For high-load situations this system will run happy as a clam but as mentioned the sweetspot is in the lower 200w range. Fan noise was also an issue but there is only so much that can be done to avoid that. I believe the original Panasonic Panflo’s were rated at 80CFM but the 120vac (Sunon?) fan included with the condenser easily pushes 110+ CFM which is extremely useful in keeping high-load pressures down but bothersome at lower loads. I think a potentiometer would be a nice addition to cut some of the fan noise.
Images:Images hosted on my website, let me know if they don’t appear.
Very nice…
I am still looking for a nf9fx danfoss to eventually rebuild the Mach II gt for home office quad use. Will probably use a larger compressor like you did.