Can pumping the water to fast defeat the whole purpose?

[jbslow]

I was wondering if a water pump moved water to fast would you actually loose performance? You know if the water moved over the surface of the waterblock to fast it might not absorb as much heat as it would at a slower flow rate. What do you think?

I am trying to relate this to a car cooling system , the car heats up and the themistat regulates the temperature. I am guessing it closes to slow the water down when the moter gets warmer thats why when my thermistat wares out and stays open all the time my car will heat up faster.

Just a thought let me know what you all think.

[jbell]

absolutely

that is why you have a thermostat on your car - it controls how fast the water flows .....


too fast is the same as too slow.

but not as bad as too slow..... it will still cool but not be as effcient as it could be.

[flounder43]

Actually, the thermostat in a car is there to regulate the temperature of the water in the engine's water jacket. If it is open all of the time, the water would never warm up here in the Minnesota winter, and the car's heater would never work. The thermostat is closed until the water is heated to a particuar temp, at which time it opens up to let in the cool water from the radiator, thereby regulating the temp of the engine.

I do not think that flowing water too fast would ever be a problem, think of it like this: if you hold your finger under cool flowing water, it feels colder than just dipping your finger into cold water. Or, in another Minnesota example, cold air blowing feels colder, and freezes your flesh faster than when their is no wind, hence the windchill. Also, think about your heat sink fans, more air, the better...

[jbell]

Originally posted by flounder43
Actually, the thermostat in a car is there to regulate the temperature of the water in the engine's water jacket. If it is open all of the time, the water would never warm up here in the Minnesota winter, and the car's heater would never work. The thermostat is closed until the water is heated to a particuar temp, at which time it opens up to let in the cool water from the radiator, thereby regulating the temp of the engine.

I do not think that flowing water too fast would ever be a problem, think of it like this: if you hold your finger under cool flowing water, it feels colder than just dipping your finger into cold water. Or, in another Minnesota example, cold air blowing feels colder, and freezes your flesh faster than when their is no wind, hence the windchill. Also, think about your heat sink fans, more air, the better...

I see what yoru saying but it doesn't work that way... if water goes through the rad too fast the rad won't absorb as much heat as it could normally...

[ButcherUK]

Empirical tests have shown that you want fastest possible flow in the waterblock, but slow flow in the rad. in general faster is better, but bigger pumps run hotter.

[flounder43]

Originally posted by ButcherUK
Empirical tests have shown that you want fastest possible flow in the waterblock, but slow flow in the rad. in general faster is better, but bigger pumps run hotter.

Yes, it is important for the water in the radiator to be adequately cooled before returning to the block. Preferably, you would expose the water in the radiator to as much surface as possible, to radiate the heat.

[flounder43]

Originally posted by jbell


I see what yoru saying but it doesn't work that way... if water goes through the rad too fast the rad won't absorb as much heat as it could normally...

I can assure you that during the summer, the car's thermostat is open just as wide as it can be most of the time...It is not there to slow the flow, it is there to keep cool water out of the engine until is warms up adequately.

[jbslow]

I'd still like to see some test results with different GPH pumps on the same watercooled setup.

Eheim 157ghp vs eheim 317ghp vs eheim 600gph

I think the effectiveness of the radiator cooling the water properly (ecpecially over a long period of time) will of set the increase in flow through the water block. I mean you can orient the the pump so the full flow of the water is dirrected into the water block. If you have the outlet going into the water block and have the pump as close as possible to the water block (shorter tubing from pump to block) also if you set the pump level with the block or above it that should help aswell. I wonder if you coiled the hose as it comes out of the block so it has to travel further before it reaches the radiator or if you put the radiator above the block and above the pump so it has to climb up to the radiator possibly slowing the water flow rate then it will exit the radiator and fall back down possibly speeding up.