Advantages and disadvantages of various types of heat sinks

Different types of finned heat sinks are designed to meet different industrial production needs, so each has its own advantages and disadvantages. Below are the representative process characteristics of four common finned heat sinks.

 

The fins and base plate of extruded heat sink are integrated. There is no splicing, and the heat conduction inside the heat sink is uniform and the thermal conductivity is high. The disadvantage is that due to the limitation of processing technology, the size of the heat sink, fin spacing, thickness, and fin height are all limited.

 

Due to the process limitation of extruded aluminum profile, the gap between the pieces cannot be too narrow, and another aluminum piece is inserted between them and fixed by a press. Because about half of the fins are inserted, and the aluminum piece is not integrated with the base plate, the thermal conductivity coefficient is not as good as that of the integral one. The thermal resistance is larger than that of pure extruded aluminum profile.

 

 

First make fins, then stack the roots of the fins together, press and process them tightly, and bite each other tightly into one. This process can be used to make heat sinks with any width and higher fins. The problem is that the pieces are separate, and the thermal resistance is large. The thermal conductivity is greatly reduced.

 

 

It is composed of a base plate and several fins. The side of the base plate is first milled with an insert slot, and one end of the fin is inserted into the insert slot and pressed tightly. This kind of heat sink only has a small part of the aluminum piece inserted into the base plate, and the contact heat conduction area is limited, so the thermal resistance will be larger. The thermal resistance parameter consistency is also poor.