i was wondering if anyones taken a rad and put it right up against a portable air conditioner so cold air is being blown through it instead of hot case air, what were your results? i mean like having a 480mm with a push pull with cougar fans so the air is still forced through not just blown on it, id imagine 55 degree air would cool better than 80-90 degree air no?
Yeah it would definitely cool better. If you think about it, that's very similar to just keeping your room temperature at 55 Degrees F. Just make sure you put the rad in front of the cool air blowing out. That'll work better.
Using an AC like that yields inconsistent temps simply because the AC is designed to cool a room by cycling the compressor, at it's hi level it's outputting the coolest air through the coils, then the compressor shuts off and the air temperature outputting from the AC begins to rise, until it reaches it's compressor cut in point.
Putting a radiator in front of the cold air output will give you cooler than ambient but not to the extreme you may be expecting, if your AC compressor ran constantly, then you'd get some serious cooling results, but the entire AC would freeze over and eventually burn up.
It's not a constant temperature it's a variable temperature and even though it may be lower than ambient possibility it can also be an inconsistent overclock temperature level, if you need a specific temperature to remain stable.
I took my office AC and ported the air directly into my PC lower intake, but the on/off compressor running proved to be too unreliable to depend on, you may get better results by putting a radiator directly in the cold air path, because you will be cycling water as your coolant, but it probably will not perform as you imagine it will.