With the continuous development of thermal management, design engineers gradually realize that optimizing heat dissipation will not only make the use of LED lamps safer and more reliable, but also steadily improve the light efficiency quality of LED through heat dissipation optimization.
LED heat dissipation design has existed since the period of LED general lighting. From the beginning, natural cooling was adopted, and gradually transition to forced air cooling. Now, the design of heat pipe composite cooling has appeared. The design of LED headlights has also made great progress in the past three years, but some professional buyers are sometimes misled by fancy marketing. Today, let Xiao Wei briefly explain three common misunderstandings of fan selection in LED lamp heat dissipation design:
Myth 1: The bigger the fan, the stronger the heat dissipation.
Many buyers met by Xiao Wei believe that the size of the fan determines the heat dissipation performance of the system. Undeniably, the fan plays an important role in the design of LED lamp heat dissipation scheme, but the size of the fan does not directly determine the comprehensive performance of the scheme.
Usually, at the same speed, a large fan may get more air flow. Under the same air volume, the large-size fan can achieve better mute effect than the small-size fan. However, because LED headlights are highly integrated products, the space size of design engineers is small.
Large-sized fans will occupy a lot of heat dissipation design space, which makes the design of radiator more difficult. Moreover, for a hollow car headlights assembly,? Large-size fans are not easy to install in standard interfaces, which leads to the decline of versatility of LED lamp products. Large-sized fans are more likely to deviate from the flow direction when the operating conditions change, resulting in uneven air distribution and even failure of LED lamps.
Myth 2: Ball fan is better than hydraulic fan.
Many fan engineers often say that "ball fans are better than hydraulic fans" when explaining to non-professionals. However, this is wrong, at least one-sided. For the life of the fan, the bearing of the fan has the greatest influence. There are generally two designs of fans on the market now, namely ball bearing and oil seal.
Compared with oil-sealed bearings, ball bearings have longer service life and higher rotational speed, but? Compared with ball bearings, oil-sealed bearings have better mute performance and their actual service life will not be too backward. At present, most consumer electronic products adopt improved oil seal bearing design? .
In addition, fully enclosed oil-sealed bearings also have indelible advantages in the early and medium-term use in the future, because the harm of dust particles has a great influence on ball bearings. Once dust enters, not only the noise increases obviously, but also the rotation speed slows down, which may lead to direct failure and scrapping.
Myth 3: Small turbofan has poor heat dissipation.
Many buyers think that turbofans should not appear in the mass market, and the sound of poor heat dissipation is still very loud, which is actually a big misunderstanding. In fact, the rotation speed and air volume of the small turbofan are very high, and the diameter of heat dissipation is changed from the top to the side, which can take away heat more effectively. The matrix LED headlight assembly used by Audi A8L also uses heat pipes to externally connect turbofans to dissipate heat.
The widespread use of turbofans actually stems more from the helplessness of the thermal design space being compressed. In fact, in small-scale LED lamp products, the noise of turbofan is relatively low. Although the air volume is low, the wind pressure of turbofans is generally much larger than that of axial fans of the same size.