Cold is just the absence of heat. Heat is the disordered kinetic energy of atoms.
Anyway, people may think slower water will increase efficience but they are wrong. Each cc of water will carry more heat away but with faster flow there are more ccs. Also the water doesn't suddenly increase in temp as it exits the block, it heats up while its in there, greater water temp means less delta T (temp. difference, this is the ONLY thing that drives heat movement) so less "force" pushing/pulling the heat. Concider this the "Voltage" and the rate of heat flow is the "Current" the only thing left is the "Resistance" this is the C/W rating of a material, in this case the Cu or Al of the block (a function based on material conductivity, thickness and surface area). So for any heat transfer aplication you want high temp difference between block and water in contact with the sides of the block (cold water), and low resistance, so a conductive material (Ag better than Cu better than AL), short distance between channels and base, and lots of surface area in contact with water.
On a side note, turbulence can help, which is unused as water is relatively insulating, by getting this cool water in contact with the block.
Edward
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