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Heat sink technology includes different kinds of heat sink. Such as skived fin heat sinks, heat pipe heat sink, led heat sinks and so on. Here we’re talking about the gap of heat sink fin. As usual in thermal engineering quite bit quite meets the attention . The fin gap of a heat sink, if not optimized for your application, can actually reduce the thermal efficiency of your heat sink. If the fins are too narrowly place then the channel is just too narrow and air features a harder time getting through! Think of air because it really is: a fluid. Don’t forget that in physics, a fluid are often either liquid or a gas. That should help you to visualize what’s going on.
The project we were working on was for a rather large heat sink, for a wireless network remote radio head (RRH) application. The customer was another Telecommunications Equipment. The customer actually had developed their own conductor for natural cooling. While the planning was basically on track , the thermal performance just wasn’t there to chill their RRH.
Single-piece integrated VC costs less than two-piece VC, maintains the same thermal performance characteristics, and adds some unique features.Single-piece VC, like heat pipes, is in direct contact with a heat source and has multi-direction heat flow.But they are cheaper to produce because they are simple and require fewer tools.
The design steps
Step 1: first determine the location
In view of these limitations, the focus is on the large heat sink itself. First of all, we should know whether the condenser is away from the heat source or close to the heat source.
· If the distance is more than 40-50mm, heat pipe heat sink is better.
The design is highly flexible, allowing for custom heat pipe bending and flattening to conform to any shape in the three dimensions.
· If the focus is on solving the diffusion thermal resistance, then the VC heat sink scheme is the best, but the basic condition is that the perimeter ratio of the heat sink to the heat source is greater than 30:1.
Step 2: simple calculation to determine heat sink performance
Can pass simple computation, will determine heat sink performance, make basic judgment.
Since the LED light itself has no infrared and ultraviolet rays, the LED light has no cooling function, and the heat sink path of LED lighting can only be derived through the heat sink closely combined with the LED bead board.
The heat sink must have the function of heat conduction, heat convection and heat radiation.
Generally speaking, if the heat from the heat source to the heatsink surface distance is less than 5mm, so as long as the thermal conductivity of the material is greater than 5, the heat can be derived, the rest of the heat must be dominated by thermal convection.
Most LED lighting sources still use low voltage (VF = 3.2v), high current (IF = 200 ~ 700mA) light beads, due to the high heat while working, it must use high thermal conductivity of aluminum alloy.
There are usually die-cast aluminum heat sink, extruded aluminum heat sinks, stamping heat sink.
Die-casting aluminum heat sink is a technology of pressure casting parts, the liquid copper-aluminum alloy poured into the die casting machine inlet, by the die casting machine die casting, casting a pre-designed mold limited shape heat sink.
The most commonly used skived fin heat sink is in the electronic products. The skived heat sink can help electronic products have the function of heat dissipation sd to not be burned out. With the development of science and technology, more and more exquisite skived fin heat sinks are coming out.
Skived fins heat sink is a kind of heat dissipation device for automotive electronics in electrical appliances, mostly made of aluminum alloy, brass or bronze plate, etc.
The heat dissipation mode refers to the main mode of heat emission of the heat sink. In thermodynamics, heat dissipation is heat transfer, and there are three main methods of heat transfer: heat conduction, thermal convection and thermal radiation. When matter itself or matter comes into contact with matter, the transfer of energy is called heat conduction, which is the most common form of heat conduction. For example, the way that CPU heat sink based on making direct contact with the CPU to take away heat.
Lori launched a new cold forged heatsink for 100W LED thermal solutions- LR0018 Cold Forged HeatSink. Using a pin-fin heatsink design for better airflow andsurface area,
the LR0018 Cold Forged Heat Sink features a very efficient 0.89°C/W thermal resistance, appropriate for high performance LED applications up to 100W. Anodized surface treatment gives the LR0018 Cold Forged Heat Sink corrosion resistance, scratch-resistance, and heat tolerance, making it more physically robust than untreated aluminum.
Compared to straight fin designs, the pin fin LR0018 Cold Forged Heat Sink performs well regardless of orientation, making them ideal for lighting applications. A square heatsink shape accommodates square-type lighting fixture designs.The LR0018 Cold Forged Heat Sink's low thermal resistance is achieved through a combination of cold forging as well as high performance materials. Cold forging produces heat sinks with better thermal characteristics and easier assembly than
traditional die-casting or aluminum extrusion.
With the AL1050 aluminum used in the LR0018 Cold Forged Heat Sink, thermal conductivity is 2.36 times better compared to die casting; from 96.2 W/mK to 227 W/mK. Cold forging allows more complex shapes, and the LR0018 Cold Forged Heat Sink is a one-piece design with no assembly required.
Lori's thermal solutions are designed with a focus on cost-effective performance, as well as weight and volume reduction. Lori's LED lighting applications are designed to offer lightweight,
space-efficient cooling at a great value.