Advice on my watercooling setup

[jaguarking11]

When water cooling a pc users generally want the cpu/gpu/northbridge as close as possible to room temperature. Watercooling loops get more efficient with higher temperature differentials.

Let me put it this way, when watercooling a cpu we want to dissipate 100-200w of waste heat as fast as possible to bring said chip close to room temperature. The reason for this is that the chip itself once overclocked has a much lower tolerance for heat. My last watercooled pc was in the prescott days. The chip was rated at ~90w with a thermal shut off of around 75c. The chip got unstable when running at 160% of its rated speed much sooner than the thermal shut down. Therefore for me to keep the chip happy I had to be in the 30-40c range. For me to do this I had to have a very large surface area to dissipate the heat from said chip and other chips that were operating out of the design spec GPU and northbridge in my case. I used a 3x120mm radiator for it, the radiator had a temperature difference of roughly 1c idling and around 2c load from in to out verified with thermal probes. This allowed me to run my prescott under full load for weeks on end at roughly 35c with a room temp of around 27c....

What you are talking about is a much larger differential temp to meet, which a single 120mm radiator is more than happy to provide. If your hot end is in a 90c chamber you add the thermal emissions from the heater cartridge to the mix, you realistically are not dissipating more than 30w of heat on it, however even if you were your not trying to cool the hot end to room temp ~25c, your trying to cool it to workable temp ~ 40-50c, a radiator is designed to increase surface area, however that surface area becomes way more efficient if the thermal differential is in the 40c range than it does in the 5-10c range. Your steppers are designed to acomodate up to 80c, therefore you realistically only need to bring down the temperature by 20-30c for them to be happy.

I remember in the old days, we used heater cores for our water cooling systems, a typical heater core can put out more than 8000BTU of heat ~2500w of disipation. However for it to reach 2500w its designed to operate with 90c water.... You get my point? The hotter the source is, the larger the delta T the more efficient it becomes, bringing down to nearly room temps is the issue.

In either case, I would do a flex hose with a squirrel cage fan for both of them. Its simpler and less problematic, the last thing you want is water to hit a 100c bed. The only hoses designed for high flex are made of silicone, unfortunately they are porous and will loose water and add vapor to the chamber, not only that, they do tend to burst if you have a powerful enough pump and enough fatigue.

Here is a graph that shows this, notice the delta T and the watts dissipated. This is a 480mm rad, but the principle applies. Modern radiators for water cooling pc's are designed for low back pressure so you don't have to use a vacuum cleaner to keep it cool.
HWlabs480GTXThermalGraph.jpg