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Aluminum Heat Sink & Profile Manufacturing

address:No. 51 Luming Road Heavy River Management District - Qing Town Dongguan City

Q Q:2131405854

Telephone:+86 13827205356

mailbox:cnc@cncstamping.com

Copper fins dissipate heat slower than aluminum

Copper absorbs heat faster than aluminum, but copper does not dissipate heat faster than aluminum. Therefore, the radiator of the pure copper base is generally equipped with a fan with high speed and large air volume to increase the heat dissipation capacity of the copper base. Manufacturers also use this concept to introduce copper-plugged tubes and copper-inlaid heat sinks. The reason is to use copper to quickly take away heat, and then quickly dissipate it through aluminum fins.

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DIY Pure Copper longer heatsink, radiactor fin
Copper absorbs heat faster than aluminum, but copper does not dissipate heat faster than aluminum. Therefore, the radiator of the pure copper base is generally equipped with a fan with high speed and large air volume to increase the heat dissipation capacity of the copper base. Manufacturers also use this concept to introduce copper-plugged tubes and copper-inlaid heat sinks. The reason is to use copper to quickly take away heat, and then quickly dissipate it through aluminum fins.

In the final analysis, what is the scientific basis for the sentence "Copper absorbs heat faster than aluminum, and copper does not dissipate heat faster than aluminum"? Maybe there are very few that you can say clearly. Today I will tell you the fundamental principle of this phenomenon.

Thermal conductivity of different heat sink materials K (W/m2K)

Silver 429
Copper 401
Gold  317
Aluminum 237

Metal thermal conductivity comparison table

The popular definition of heat transfer coefficient is "the heat passing through a unit area in a unit time under a unit temperature difference", and the unit is J/m2ks, or W/m2k. Where J is the heat unit Joule, m2 is the area unit square meter, K is the temperature unit Kelvin, can also be replaced by C on the Celsius scale, and s is the time unit second. From the above formula, the thermal conductivity of copper is about 1.69 times that of aluminum. Therefore, using copper and aluminum to make a radiator with the same cross-sectional area, pure copper can take more heat per unit time than pure aluminum. "Copper absorbs heat faster than aluminum", the previous half sentence has been demonstrated.

Copper Hot Water Fin Tube
Material, specific heat capacity J/kgK

   Aluminum 0.9

   Silver 0.24

   Copper 0.39

Comparison table of metal specific heat capacity
The latter half sentence "Copper does not dissipate heat as fast as aluminum", this is indeed the case. Proving this needs to lead to another important thermodynamic parameter: specific heat. Anyone who has studied middle school physics knows that the definition of specific heat is "the amount of heat required to raise the temperature of a unit mass of matter by 1 degree", and the unit is J/kgK. You can also see from the above table that the specific heat capacity of copper is smaller than that of aluminum. Copper reduces its temperature by 1 degree, and its heat dissipation should be less than aluminum. In this way, copper should dissipate heat faster than aluminum. But you may not notice that the density of copper is 8.9kg/m3, while the density of aluminum is only 2.7kg/m3, which is close to 3.3 times that of aluminum. Therefore, when a heat sink of the same volume is made, the quality of copper is nearly 3.3 times larger than that of aluminum, and the heat capacity of pure copper is still nearly half larger than that of pure aluminum. As the heat capacity increases, the heat dissipation becomes slower. Through the explanation of the above theory, we have also found the reason why "copper is not as fast as aluminum"

In this way, we fundamentally understand the reason that "copper absorbs heat faster than aluminum, and copper does not dissipate heat faster than aluminum". This theory can be used later when choosing a heat sink. If you choose a pure copper heat sink, you should choose a fan product with a higher speed and a larger air volume to avoid the heat of the copper from being unable to dissipate, resulting in a cooling bottleneck.
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