[deeppow]

Originally posted by Alchemy
The change in temperature of the water between any two points in a water cooling system is very small because of the high heat capacity of water.

The difference in temperature between the air and the water or the water and the CPU core is, of course, very significant.

Actually I don't think I misunderstood.

The water can't be cooler than the air unless we're using phase change or refrigeration of some type, e.g. evaporative cooling of the air going into the rad. Thus the temp of the water at the entrance of the water block will be at room temp at best unless other mechanisms are used.

This does raise an interesting thought. This line of thought says one of the problems in testing required of BillA, or whomever, is the accuracy for temperature measurements in this situation. Measurement of the energy transferred from, and to, the fluid is really not possible via the fluid temp, or extremely difficult at best. What about a simulant fluid with less heat capacity so temperature can be better used? This is done all the time in many experimental applications and must have been thought of here.