Previously, we introduced and explained the principles of finned heat exchangers. In this issue, we will briefly describe the precautions to be taken during the use of finned heat exchangers. As a professional company, we are very familiar with our products.

The finned heat sink, referred to as a heat sink, is classified as a "passive cooling component" in the field of electronic engineering design. Although it has many advantages, there are also many considerations to keep in mind. Below are some important points to note when using a finned heat sink.

The finned heat sink draws in cool air from above through a fan, and when in use, it absorbs heat from the lower fins as the airflow passes through and then dissipates it. It is important to note that this top-down airflow direction, although different from the heat dissipation design of the main chassis, can effectively lower the overall temperature of the motherboard over a wider range. Below, we will introduce the function of the finned heat sink.

A type of finned heat sink for laptops, installed within the laptop chassis and located between the air outlet of the chassis and the fan, includes a heat sink body, a boss set on the upper surface of the heat sink body, and a cold air passage formed between the upper surface of the heat sink body and the chassis where its upper end contacts or is close to the chassis. The finned heat sink has a simple structure, facilitating rapid airflow of cold air, and is designed for use with laptops. It can quickly reduce the temperature impact of the high-temperature heat sink body on the upper casing of the laptop, ensuring that the laptop meets safety standards while increasing design costs. Below is an overview of the manufacturing method for the finned heat sink.

During the development of high-power, high-performance lighting, the finned heat sink has shown its shortcomings. As the diameter of the lamp increases, the mold costs also rise. With the increase in lamp power, both the length and weight of the lamp increase as well. Let's take a look at the manufacturing technology of finned heat sinks.

The most commonly used heat sinks for LED lighting fixtures are finned heat sinks. Why is that? Firstly, they are cost-effective, and secondly, they are easy to process. Let's take a closer look at what finned heat sinks are. The materials for finned heat sinks include good quality aluminum, iron, and copper, with copper being rare due to its high cost, which manufacturers generally avoid. There are two main manufacturing techniques: forging and extrusion. The following examples illustrate these processes: Finned heat sink forging process: The forging process of finned heat sinks involves heating aluminum blocks and filling them into molds under high pressure. The advantages include a fin height of over 50mm and a thickness of less than 1mm, allowing for a large heat dissipation area within the same volume. Forging can achieve good dimensional accuracy and surface roughness. However, due to the low plasticity of metals during forging, they can easily crack under deformation, and the high deformation resistance requires large tonnage (over 500 tons) hydraulic presses, which significantly increases equipment and mold costs, thereby raising product costs. Finned heat sinks are also involved in cutting, riveting, embedding, reflow soldering, and the popular high tower heat pipe radiator market. The mainstream radiator fins are typically standard square shapes, but some products have unique shapes. For instance, circular radiators represented by South Korean Simin and tower-type radiators represented by Tt have simpler riveting technology compared to other manufacturing techniques. This is also a common type in the low-end radiator market. The emerging mainstream market features tube-type radiators that use highly conductive heat pipes; the base of the radiator is made entirely of copper, while some manufacturers use all-copper designs for the fins while others opt for all-aluminum designs. The principle behind this design is that the all-copper base absorbs heat from the CPU and then quickly transfers it to the fins via the heat pipes for dissipation. From a theoretical standpoint, radiators using heat pipe technology require multiple transfers of heat before it can be dissipated. Therefore, the thermal resistance between different materials directly affects the overall performance of the radiator. Finned heat sink extrusion process: Aluminum is soft and easy to process, making it a long-standing material in the radiator market. In simple terms, aluminum extrusion technology involves heating aluminum ingots at high temperatures and then pouring molten aluminum into a grooved extrusion mold under high pressure to create fin blanks. These blanks are then cut and formed into the familiar fins we see. Aluminum extruded fins are cost-effective with a low technical threshold. However, due to material limitations, the ratio of thickness to length for fins cannot exceed 1:18. This makes it difficult to increase the heat dissipation area within limited space, thus reducing the cooling effect of aluminum extruded fins. It is evident that there are structural differences between these two types of radiators; stamping is relatively simple while die-casting can create complex shapes. However, one should not solely judge the quality of a radiator based on these factors; we should choose products that offer good value for money rather than just opting for high-end materials.