How do you choose LED heatsink?

by / Monday, 19 March 2018 / Published in Company Blog

We often find heatsinks in electrical appliances or computers. It is a device that dissipates heat easily to heatable components in appliances or computers. Most of them are made of aluminum alloy, brass, or bronze. Such as. If the heat emitted by the components is conducted to LED heatsink, it will be distributed to the surrounding air via the heatsink. So how to choose the right LED heatsink?


LED heatsink is mainly used to ensure that the operating temperature of the components is maintained below the maximum allowable temperature provided by the component manual. In most cases, the most suitable heatsink is not the most expensive and the largest, but it can provide the best heat dissipation performance. Therefore, it is important to first understand the basic parameters of LED heatsink.


In order to ensure the highest efficiency that LED heatsink can provide, when selecting the appropriate heatsink, please pay attention to the following basic parameters:

  • Thermal environment
  • The heat resistance value of the heatsink
  • Heat sink density
  • Combination method


Thermal environment

When selecting LED heatsink, it is necessary to know the thermal environment when the components work. The cooling environment can be simply divided into “forced airflow” and “natural conditions.” “forced airflow” means that the airflow induced by a typical fan or blower helps to dissipate heat, in “LFM” units. “Natural conditions” means that heat transfer depends only on the free-flowing airflow around the heatsink, in “°C/W” units.


Thermal resistance of the heat sink

Knowing the cooling environment, we can try to calculate the thermal resistance of LED heatsink, which is “Thermal Resistance”, which is a comprehensive parameter that reflects the ability to block heat transfer. A lower thermal resistance value means more efficient heat transfer. The unit of thermal resistance is “°C/W”, that is, the temperature difference between the two ends of the thermal conduction path when the object has a continuous heat transfer power of 1W. For LED heatsink, the two ends of the heat conduction path are the heat generation device and the ambient air, respectively.


Heatsink density

There are many parameters to consider when choosing a heatsink, but one of the key parameters—heatsink density—must be taken into account. In heat fin of a planar heatsink, the optimum heat sink spacing is strongly related to two parameters: the air flows velocity and the width of the heatsink in the direction of gas flow.

The average performance of a typical heatsink is linearly proportional to the width of the heatsink perpendicular to the direction of gas flow. Therefore, it is recommended that LED heatsink was selected to be perpendicular to the width of the gas flow direction, which helps to dissipate heat.


Combination method

There are different heatsink bonding methods available on the market. The most common methods include: adhesives, push pins, and clips.

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