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The material that produces aluminum heatsink heat conduction property is good, at present the majority uses 6063 aluminium alloy, its have the characteristic such as easy processing, heat dissipation performance is good, mechanical property is good. Additional need from ingot, mold, extrude craft a few respects to cooperate, ability produces heat sink profile smoothly.

Because the mold of aluminum extrusion heat sink profiles are a lot of long and thin fin, want to bear very big extrusion pressure, every heat sink fins should have very high strength and toughness, if the performance between each other has very big difference, easy to make the strength or toughness of those teeth produced fracture.

Can smooth extrusion success, the key is the design of the mold to reasonable, manufacturing to accurate, this aluminum heat sink manufacturers of higher technical requirements, only strong manufacturers can complete from mold design extrusion to the finished product of the whole process.

Heat pipe heat sink is the heat dissipation efficiency is very high, the power is very big, the performance is very stable one kind of heat sink, no matter be on civil or industry, have very extensive application.

Working principle of heat pipe

In fact, the working principle of the heat pipe is also very simple, the heat pipe is divided into two parts: evaporation and heating end and condensation end. When the heated end begins to be heated, the liquid around the wall of the tube will instantly vaporize, producing steam. At this point, the pressure on this part of the tube will increase, and the steam will flow toward the condensed end under the traction of the pressure. When the vapor reaches the condensing end, it condenses into a liquid and gives off a lot of heat. Finally, it returns to the heated end of evaporation by capillary force and gravity to complete a cycle.

Advantages of heat pipe heat sink

The heat pipe in the heat pipe heat sink has the advantage of extremely fast heat transfer speed, which can be installed into the heat sink to effectively reduce the value of heat resistance, increase heat dissipation efficiency, with a very high thermal conductivity, up to 100 times of the pure copper thermal conductivity, has the reputation of "hot superconductor".The heat pipe CPU heat sink with excellent technology and design will have the strong performance that the ordinary heat pipe free air cooling heat sink cannot achieve.

At present, the vast majority of the CPU heat sink used heat pipe technology. Heat pipe heat transfer efficiency and diameter, structure, process, etc. Are related to the current high end heat pipe heat sink, the use of 6mm heat pipe, but also a few with 8mm products. A Taiwan research institute gave a group of reference values, the diameter of 3mm genuine heat pipe, 2.8 standard heat transfer cycle can only transfer 15W of heat, and the diameter of 5mm heat pipe, in 1.8 heat transfer cycle maximum heat transfer reached 45W, is 3 times of 3mm heat pipe! The 8mm heat pipe product can transfer up to 80W of heat in only 0.6 cycle.With such high heat transfer, without a good heat sink design and fan, it is easy to lead to the heat can not be properly divergent.

Heat pipe heat sink in civil electronic products, computers, CPU, graphics card applications are only a small sector, it is also widely used in industrial power electronics, such as new energy, power supply industry, IGBT, SVG and other high-power devices can use heat pipe heat sink to heat.

Industry users are paying attention to the overall performance of the photovoltaic inverter, not just focus on their conversion efficiency, the largest dc voltage, ac output power, protection grade, such as heat dissipation problem of photovoltaic inverter also need us to pay special attention to, choose a high performance inverter heat sink is very necessary, because it will directly affect the inverter heat dissipation performance indicators.

Various components in the photovoltaic inverter have rated operating temperature. If the photovoltaic inverter  heat sink selected by the inverter has poor heat dissipation performance, when the inverter continues to work, the heat generated by the components inside has been collecting in the cavity, and its temperature will become higher and higher. High temperature will reduce the performance and life of components, the machine is prone to failure.

When the inverter works, it generates heat, and the power loss is inevitable. For example, for an inverter of 5kW, the system heat loss is about 75-125w, which affects the power generation. To solve the heat dissipation problem of inverter, it is best to cooperate with heat sink manufacturers to customize the inverter heat sink. After the heat sink manufacturers optimize, the heat dissipation loss can be reduced.

At present, the heat dissipation technology used in photovoltaic inverter heat sink mainly includes natural cooling, liquid cooling, forced air cooling heat sink, etc., and its main application forms are natural cooling and forced air cooling.

The natural cooling of inverter heat sink

Natural cooling means that no external auxiliary energy is used to let the local heating device dissipate heat to the surrounding environment, so as to achieve temperature control. Natural cooling is suitable for low power devices with low requirements for temperature control.

Forced air cooling of inverter heat sink

In general, the cooling method of forced cooling is mainly by means of fans and so on, thus taking away the heat emitted by the device. At present, the material of this kind of high power heat sink basically is to wait with aluminous, or cupreous aluminous compound.

Lori has cooperated with many enterprises in the photovoltaic industry, and has provided them with efficient inverter cooling solutions for a long time. Whether it is natural cooling or forced air cooling, we have successful application cases. We can provide various types of heat sink products, such as skived heat sink, water cooled heat sink, heat pipe heat sink and so on. For further information, please contact us.

General heat pipe information

Lori Heat Pipes assemblies have emerged as the most important tool available for the transfer of heat energy. How does the thermal engineer cope with conflicting demands for small package that incorporates suffcient cooling to insure high component relibility and long component life?  The thermal designs of equipment have become as important as the electronic designs. Overheating shortens component life, threatens specification compliance by decreasing performance. Of the carious means of transferring and dissipating this heat, the heat pipe is in many respects the most satisfactory. The heat pipe is a self-contained device of very high thermal conductivity. Heat pipes are relatively small and lightweight, they transfer heat at a high rate over a considerable distance with extremely small temperature drop.

What is heat pipe and what are major variables associated with heat pipe performance?

The heat pipe is a sealed tube which enclose a capillary wick. The wick is saturated with liquid phase of working fluid. The remaining volume of the pipe contains the vapor phase.In its longitudinal direction, the heat pipe contains an evaporator section and condenser section which are separated by an adiabatic section. As heat is applied externally at the evaporator end, the fluid in that section vaporizes. The resulting difference in pressure drives vapor from the evaporator to the condenser section,where it condenses thus releasing the latent heat of vaporization. The condensed fluid travels by capillary action along the wick back to the evaporator end. Then the whole cycle repeats. The heat pipe can therefore transport a large amount of heat with small unit size and weight.

Variables related to heat pipe performance:

1. Total heat carried from the input end to the output end in Watts.

2. Thermal gradient in heat pipe along its length.

3. 3-Input and output thermal drop.

4. Gravity orientation.

5. Maximum storage or use temperature.

Operating temperature: Heat pipe cooling performance is function of it's temperature. The higher the temperature the, the more conductive the unit and the lower the overall thermal drop.A heat pipe is not damage when allowed to cool below it s temperature rating; it may cease to function but will resume normal activity when warmed again to within its operation limits. The maximum storage temperature range is always calculated for use under atmospheric pressure, and the range will be lower in a vacuum or at high altitude.

Custom design:

Lori engineers can design and build custom heat pipes heat sink to solve any thermal problem.The cost on special heat pipes are comparable with those of standard models, since most of custom devices can be made largely from properly selected and assembled standard components.

Typical applications of heat pipes: Heat pipes, because of their lightweight, compact structure and their efficient, virtually isothermal operation, have found a wide variety of applications. 

Heat pipe applications can be grouped into:

1. Cooling

2. Temperature leveling and eliminating hot spots

3. Remote cooling (separation of heat source and heat sink)

4. Constant temperature maintenance

5. Temperature control