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Originally Posted by pauldenton
well the same arguement would apply: say in this instance the 2 GPUs produced 30W each, and the pump 10W:
then the difference between the coolest water (directly after the rad) and the warmest (directly before the rad) would only be approx 0.5C... (since the total heat input is 140W)
it is better to pick the order that gets you the easiest job of routing the tubing...
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It seems to me you have some major faults in your logic:
In your calculation you use 4 liters as the refference. Which is just over 1 US gallon. I don't know what kind of system you've got but mine does not hold anywhere near that kind of water. Even with the res I'm only using 3 1/2 cups of what and then less than 1/2 cup of water wetter. So lets just say 4 cups total. That's just under 1 liter. So though it might be moving at 4 liters per minute, it is still only 1 liter of water. Also you assume that the system can reach a point were the heat is removed as fast as it is added. This may never occur, depending on effeciency of the rad and the alrflow of the fan.
Lastly and again, you are looking at the system as a whole not an individual point in time. The heat transfer is not happening equally throughout the whole loop. The water is heated and cooled at set points in space and time. Thus the heat is not instantly teleported to the rad to be shed. In the multi-heat configuration you have a series of heat sources that cascade heat into the loop and only one point at which it is shed.
Equations or great on paper but they don't always work in the practical world.
Take my system for example, worse case I have about 148 watts being generated. By your calculations my sysetm does not have enough wattage to increase the water temp by 1C and yet it does and yet it can and does increase more than that.
There are many other factors that have to be taken into account. The ability of the block to transfer heat, rad/fan effeciency, water flow or slow downs, tubing size and length etc, etc.