the smaller you can keep your "cold-body" the better it will perform, because the smaller it is, the lesser the total surface area to it will be, which means less place for heat to enter. now, the volume should be just enough to cover the evaporator completely. The main restricting factor in heat capacity, is the total surface area between the liquid and the evaporator, so you need that to be maximized, before you look at things like proper fluid ventilation in the reservoir, and a couple of other things....
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