Acer 6920 Airflow

I'm kind of interesting in making a laptop cooler like this
http://forum.notebookreview.com/showthread.php?t=286894

im just wondering how the airflow on the 6920G works... where would I place the fan, and should it be blowing air up or pulling air down?

 

You can try putting your fingers near the vent (not fully blocking the airway) and see in which direction the air is flowing.

As for making custom fans, there are a number of issues associated with using these fans. First of all, since they increase the airflow, they increase the dust accumulation over time. Also they can pressure the USB ports if their power consumption is more than what the port can handle. Finally, they can also generate a lot of noise as the OP has stated in the thread that you just linked to.

 

This should help. The FAN is the only active cooling element in the laptop, but the extra vents for the CPU and GPU are simply begging to have a fan stuck under them.

 

Tehsuigi,
From the picture you shown, was that the Fan is blowing the heatsink?
Should I blow the CPU hole and GPU hole instead of the Fan hole?
I noticed Fan hole accumulate the most DUST.

 

The fan takes air from the bottom of the laptop (that's why it's so dusty) and blows it onto the exhaust.
The CPU and GPU vents don't have fans, but I'd imagine an extra cooling fan there could really bring temperatures down.

 

so if i just had 1 fan, where would i put it? underneath the fan pushing air up or underneath the cpu/gpu area?

im planning on using a powered usb hub so i dont have to worry about my laptops usb ports

 

The fan take air from bottom and blow to the exhaust? Then how does it cool down the CPU!? Or is it the fan is blowing the heatsink then the heat would release via the exhaut?

 

The CPU and GPU heatsinks have copper heat-pipes that end in a grille in front of the fan - that's the exhaust which the fan blows on to cool the system components. See here and here.
Darrick, I've got no idea. Couldn't you try both?

 

Thanks. I guess I know what you mean already.
It seems that the GPU and CPU have a lot of metallic nails on it?? I mean like some spikes on the GPU and CPU surfaces. Is it the same for other machines(as 6920G).

 

Well, those dimples/protrusions/whatevers are a way of diffusing heat without having a fan - the heat gets dissipated faster from smaller objects than larger ones, so instead of a big brick of metal, they use that design-which-I-can't-remember-the-name-of. Standard heatsink design, if I'm not mistaken.

 

I know this logic, but, your explanation is not so true.
Heat doesn't release faster in a smaller object. Actually, it is the total surface area exposed. A big object have a certain amount of total surface area expose.
A simple example(constant variable=material/element):
A normal cube. It has 6 sides. Just example no true or exact calculation, 6x100cm2(assume it is 100cm2) = 600cm2
This normal cube got cut into 21 cubes equally and neatly.
1 cube have 6 sides. 21 cubes would have 21x6 = 126 sides. Just example no true/exact calculation, 126x10cm2(assumed it is reduced to 10cm2 due to cut into 21 cubes) = 1260cm2

Conclusion:
Heat release faster in a bigger/more surface areas(of course, compared to the same element/material with a same weight just different in "got cut into smaller pieces" or a "normal" one).

 

Hey, I never claimed to be a physicist.

 

LOL! I am not physicist as well. I am only a art/design/animation student.
This only a piece of general knowledge.
I wish I am technician on electronic. So, I can make myself a SUPER COOLER!! FTW!