Water cooling process


The water-cooled radiator has a water inlet and a water outlet, and there are multiple water channels inside the radiator, which can give full play to the advantages of water-cooling and can take away more heat. This is the basic principle of a water-cooled radiator.

From the perspective of water-cooling installation methods, it can be divided into two types: built-in water-cooling and external water-cooling. For built-in water cooling, it is mainly composed of radiators, water pipes, water pumps, and sufficient water sources. This destined that most water cooling systems have a large "volume" and require sufficient space inside the chassis. As for the external water-cooled radiator, because its cooling water tank and water pump and other working components are all arranged outside the case, it not only reduces the space occupation in the case, but also achieves better heat dissipation effect.

A water-cooled (liquid-cooled) heat dissipation system must have the following components: water-cooled blocks, circulating fluid, water pumps, pipes and water tanks or heat exchangers. The water-cooled block is a metal block with a water channel inside. It is made of copper or aluminum. It is in contact with the CPU and will absorb the heat of the CPU. Therefore, the function of this part is the same as that of the air-cooled heat sink. The difference is It is that the water-cooled block must have a water channel through which the circulating fluid passes and is completely sealed, so as to ensure that the circulating fluid does not leak and cause a short circuit of the electrical appliance. The function of circulating fluid is similar to that of air, but it can absorb a lot of heat and keep the temperature unchanged. If the fluid is water, it is a well-known water cooling system. The function of the water pump is to push the circulating fluid to flow, so that the fluid that has absorbed the heat of the CPU will flow out of the water cooling block on the CPU, and the new low-temperature circulating fluid will continue to absorb the heat of the CPU.

      The water pipe connects the water pump, the water cooling block and the water tank, and its function is to allow the circulating fluid to circulate in a closed channel without leakage, so that the liquid cooling system can work normally. The water tank is used to store the circulating fluid. The returned circulating fluid releases the heat of the CPU here, and the low-temperature circulating fluid flows into the pipeline again. If the heating power of the CPU is small, the large-capacity circulating fluid stored in the water tank can ensure the circulating fluid. The temperature will not rise significantly. If the CPU power is large, a heat exchanger needs to be added to help dissipate the heat of the CPU. The heat exchanger here is something similar to a heat sink, and the circulating fluid transfers heat to a large surface area. The heat sink, the fan on the heat sink will take away the heat flowing into the air. If it is a small closed liquid cooling system, you can omit the open water tank to allow the liquid to flow back and forth between the pump, water block and heat exchanger to prevent the circulating liquid from being exposed to the air and deteriorating.


Because the number of fans is reduced, the vibration and noise generated by the fans are also reduced, and the heat dissipation effect is much higher than that of the air-cooled system.

Water pump

The water pump circulates the water in the system, constantly changing the warm water to cold. The volume of water flowing through the water channel and the radiator is critical, because this movement takes the heat away, just like a high-speed fan can better maintain the work of taking heat away from a conventional heat sink.

The performance of the pump can be seen from the two specifications of flow rate and head. Velocity refers to the amount of water that can be extracted when there is nothing restricting the flow of water. The head is the height that the pump can reach in the vertical direction when spraying water upwards. The head is the most important number, it reflects the ability of the water pump to overcome the resistance of the water channel and the radiator.

The waterways all follow a very simple design concept. A copper or aluminum sheet with some heat sinks on it. The water enters here and flows around in a pattern that is designed to maximize the amount of water that contains heat. Add a metal partition on the pure copper bottom, cut the liquid into N parts for full cooling, and increase the heat dissipation area by absorbing the heat on the metal partition, without any restriction on the water flow.

heat sink

The performance of the radiator plays the most critical role for a water cooling, and even the performance of the radiator can be used to measure a water cooling. The large heat generation brought by the improvement of hardware performance can dissipate heat from multiple heat sources at the same time, and the heat generation is huge.

Generally, there are three kinds of manufacturing materials for hoses: polyvinyl chloride, polyethylene, and silicone. Polyethylene has a bright color, is very strong and resistant to twisting, but is expensive. Polyvinyl chloride is the cheapest hose used for water cooling, but it is very hard. It is not recommended to use it in water cooling systems, which may make the installation of water channels very difficult. The silicone tube is made of very soft rubber material, which is extremely flexible and can be rolled very tightly without bounce.

Every single connection point must be firmly clamped. Do not use plastic hose clamps. These are not enough. Use metal connection peripheral screw clamps to completely eliminate the risk.

Special heat transfer fluid is used. Because the radiator, pump, heat absorption box, hose, etc. in the entire water cooling system are all made of copper, aluminum, welding material PVC hose, etc., so many kinds of materials are made together, if ordinary Distilled water and deionized water will become weakly acidic liquid cooling after a period of time. Long-term use will rust the metal structure and seriously affect the heat dissipation function of the cooling system.

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