Vandaag een mooie samenvattende post van Martinm over oa dit onderwerp:
Hier die post en de rest van het draadje.
Pressure
Pressure does vary through the loop, it is at it's highest behind the pump and lowest right before the pump.
Pressure however has no impact to thermal performance, because liquids are incompressible at least in the sense of our tiny little pressures we're dealing with. If the fluid is not compressed, there no density change to the fluid, and it results in no performance difference.
Pressure Drop. Remember pressure drop is a "DIFFERENCE" in pressure, it is the pressure difference of the inlet vs. the outlet and it doesn't matter where in the system that component is. If the pressure drop was 5PSI at 1GPM, it would always be 5PSI. It could have 20PSI at the inlet, but it it was flowing 1GPM, the outlet would be 15PSI. Or it could be 7PSI at the inlet and 2PSI at the outlet.
Flow Rate
Flow rate is constant throughout the loop.
Velocity
Velocity is NOT constant throughout the loop, and to no suprise...velocity is the key to increased thermal performance. Because flow rate has to be constant throughout the loop, when an opening gets smaller, the fluid has to go faster. Nozzles and small channels are designed for one thing, to increase velocity where heat transfer occurs. The more velocity, the more turbulent the fluid and the more likely more of the fluid comes in contact with the heat transfering surfaces.
Loop Order
-The coldest water is located directly behind the radiator, but the differential is extremely small and almost always less than a degree and often only a few tenths of a degree cooler. The question you have to ask is, is this .2C worth the plumbing arrangement needed for that setup. For some the answer is yes, for many no. If the DTS sensor resolution is 1C, chances are you'd never be able to measure the difference.
-The only thing that really matters is having the reservoir or T-line before the pump so you can adequately fill the loop without the pump running dry at startup. After filling it really doesn't matter.
Hier die post en de rest van het draadje.