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Radiator inlet/outlet - Page 2

post #11 of 14
Quote:
Originally Posted by 86 5.0L View Post
I would want the coldest air hitting the hot side(barb side) of the rad
Quote:
Originally Posted by Khaotik55 View Post
The push fans should be placed on the cooler side so the fans push cooler air over the hotter side helping it cool the fluid better.
Two points:

1. Ideally you would want the coolest air going over the coolest fluid. This makes it behave more like a counter flow heat exchanger, which is more efficient than a parallel flow one.

I know this sounds counter intuitive but it is true. Heat transfer is driven by temperature difference, if you have the air and water flowing in the same direction the best you can hope for is that they meet in the middle, temperature wise, in an infinitely long exchanger.

If you have a counter flow arrangement then the water can get closer to the cold air temperature than is possible with the parallel flow. In theory, given an infinitely long exchanger, the cold can get to the hot inlet temp, and the hot to the cold inlet temp.

Diagrammatically:

From the wikipedia article.

2. And this is the important one. In PC water cooling the water temperature change through a rad is usually quite small, in the region of 1-3°C. As such it is actually not going to make a huge difference either way, as the air-water delta is going to remain very similar no matter which side the hot water goes to first.



Tl, dr: Ideally you want the water going in at the cold air side, in reality it is not going to make a noticeable difference. So the answer to the question is no.
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post #12 of 14
IMHO, I want to blow the most fresh ambient air over the hotter of the radiator for 2 reasons.

1) Maximize thermal transfer
Labeling the 2 sides as 'hot' and 'cold' is for simplification. The 'cold' side is not exactly 'frigid cold'. It is always warm with respect to the air temperature. It is only 'cold' relative to the 'hot' side.
So, if you blow fresh ambient air first over the 'cold' side first, the air will be warmed up slightly. This warmed air will then pass through the 'hot' side and the thermal transfer in that side is not optimal as the temperature differential between the air and the water is not maximum.

However, if fresh ambient air is first blown over the 'hot' side, thermal transfer is most optimized. This is where the maximum heat transfer occurs. The air will be warmed up (higher than the above config, of course). And this warmer air will pass through the 'cold' side. But the temperature of the water in the cold side has been reduced subsequent to the large thermal transfer taken place in the 'hot' side. So, heat transfer at that time on that side is relatively less essential and less substantial compared with what happened on the 'hot' side already.

2) Minimize time for heat remaining in the loop
Heat should be dissipiated from the source to the ambient in the shortest time. Prolonging the heat transfer process produces no benefit. To this end, when the hot water enters a radiatior, it is better to remove the heat from the water to the ambient as quickly as possible. This calls for heat transfer on the 'hot' side.

As mentioned by GingerJohn above, the difference between the 2 configurations might not be substantial. But for the sake of 'Pursuit of Performance', I would stick with with this config, unless there are other factor prohibiting otherwise.
post #13 of 14
It doesnt matter. Once the water reaches it's delta, it becomes insignificant.
    
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post #14 of 14
I have a BI GTX480 and have tried it in both orientations and couldn't detect a measurable difference.
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