First, how can you calculate, or otherwise decide, how powerful a chiller is needed? The aquarium chiller manufacturers have some online calculators you can use to estimate which of their models would work for a particular aquarium setup. But how does that kind of calculation translate to overclocking a computer, especially in cases in which the reservoir is very small (as opposed to a reservoir that is beer cooler-sized)? Are there formulas that take into account the TDPs of, say, the the overclocked CPU and GPUs? The bit-tech article used a Hailea HC-500A, which the manufacturer rated at 790W and 1/2hp, but Iosefini has said on this board, for example, that he has used I think an AquaEuro chiller rated at only 1/13hp, which sounds on the surface like it is much weaker.
Second, what factors can you go by to compare different companies' makes of chillers? Are they rated across the board in BTUs, for example? (I haven't been able to find any BTU ratings for Hailea.)
Third, how do you go about insulating or protecting the motherboard and its components against condensation damage? I am planning to be very careful with where I set the chiller temps relative to ambient humidity levels, but I want to take the extra steps to further protect the components against water damage just to be on the safe side, if it's not to hard.