Fujikura Heat Pipe – Smart Cooling
Heat pipe from a 15" MacBook Pro
How can you keep increasingly hot CPU and GPU chips cool while making laptops thinner?
The answer is smart cooling using a combination of heat-sinks, temperature sensors and airflow.
The Fujikura heat pipe is a good example of effective laptop cooling.
Here’s how it works:
1. The hottest components on the logic board are the CPU, GPU and Northbridge. The tops of the chips are connected via thermal grease to their contact plates (1.)
2. The heat is then carried (dissipated) via “pipes.” Inside these pipes are a spiral metal filling and fibers that “draws” the heat down the line.
3. On the pipe itself, temperature sensors (2) are placed to determine how hot the system is getting. More graphics intensive apps will produce more heat and the temperature sensor will report the temp back to the system to determine fan speed.
4. The heat is this taken to a heat-sink (3) which further spreads out the heat. A fan is connected to this heat-sink and draws the heat out of the system.
Pretty cool 
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