Here is a photo summary of my geothermal loop I setup last fall. The entire thread is posted in the cooling experiments section. Link: http://www.overclock.net/cooling-exp...ml#post7022905
I started to get into overclocking and moved from the stock Q9550 cooler to a Zalman 9500... I was able to only moderately overclock with the less than desirable Zalman... I then had the idea of a geothermal loop, so I started googling and found a few other people that have done it (see main thread for links). I came up with a plan, and started digging.
I stopped digging around 42" because of all of the groundwater seeping into my hole which made the red clay a nightmare to dig. I placed a 50' cool of 1/2" copper refrigeration tubing in the ground, and connected the ends to PVC pipe, which run into the house.
One pipe is connected to the discharge of an Ehiem 1250 pump, the other end dumps into my home-made reservoir.
I then submerged a temporary 10W pond pump in the reservoir and I use it to circulate water to the CPU block and back to the reservoir. The warm water from the CPU loop simply mixes with the cool water from the geothermal loop.
All of the hoses inside the house are insulated to help keep them cold, since the water is below ambient room temps. I am running approximately 40% antifreeze and 60% demineralized water. With the antifreeze in the system, I do not have to run the pump during below freezing weather, since the pipes leaving the house are exposed to the elements.
Right now, the water temperature is averaging around 6.4C when I start the loop. I am currently using a temp gun for temp readings, since my remote digital thermometer is currently out of service. CPU temperatures at idle are around 21, loaded on prime small fft around 43... (overclocked from 2.83 to 3.895)
I am using an unlapped Q9550 with an unlapped Apogee GTZ waterblock, with AS5 TIM. I plan on lapping both the next time I have the computer all apart.
Temperatures will vary slightly with the seasons, and I will have much better data a year from now.
Thanks for looking!! Please view the main thread for all of the pictures and discussion from day one. Edited by walker450 - 1/5/10 at 10:54pm