Minimize PCB Heating Temperature, conduction is the most prevalent heat transfer method in PCBs

Conduction is the most prevalent heat transfer method in PCBs
If one end of a PCB has a higher temperature, then energy will be transferred down the PCB towards the colder end. The higher speed particles will collide with the slower ones with a net transfer of energy to the slower ones. 

The rate of conduction heat transfer is: 

 H= (K x A (THOT–TCOLD) / L

        graph.gif

H = Energy conducted in time (joules/second)           K = Thermal conductivity of the copper (385 W/(m·K) @ room temp)            
A = Area of copper on pcb                T = Temperature              L = Distance between hot and cold bodies

          Material        

 Thermal conductivity 
          W/m*K           

 Diamond           1000 - 2600
 Silver                  406
 Copper                  385
 Gold                  320
 Aluminium                  205
 Brass                  109
 Platinium                    70
 Steel                  50.2
 Lead                  34.7
 Mercury                   8.3
 Quartz                    8
 Ice                  1.6
 Glass                  0.8
 Water                  0.6
 Wood            0.04 - 0.12
 Wool                  0.05
 Fiberglass                  0.04
 Expanded polystyrene                  0.03
 Air (300 K, 100 kPa)                 0.026
 Silica aerogel                 0.017
 Styrofoam                  0.01
   

copper is an excellent temperature conductive material

                                                                                                             source: Analog Devices

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