Bert - Considering you are using computer cooling gear to set up most of this, have you considered a vapo style setup for chilling the water? Cost effective? probably not.. but functionality wise I dare say you could achieve great cooling results..
I had a phase change cooling setup on one of my AMD Athlon XP systems back in the day, under the stock air cooler, the CPU would have idle temps around 60°c, and up to 85°c under load... With a water cooling setup I got it down to 30° idle and 37° under load (whilst also maintaining a 1.5ghz overclock with + 0.9v to the core)
I eventually wanted more, went to a phase change refridgerated cooling system and had the CPU sitting at -60° under full load with the same 1.5ghz overclock...
Granted, the heat loads etc are different, as is the application of the cooling to the fridge.. However I'm sure you could figure something out..
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