This morning, Lei Jun, founder, chairman and CEO of Xiaomi, announced that Xiaomi has officially launched a future-oriented cooling technology - Ring Cooling Pump Cooling Technology. The official poster shows that the Ring Cooling Pump Cooling Technology was first launched on the Mi MIX 4 Magic Modified Edition.
Lei Jun said that the ring cold pump cooling technology refers to the cooling method of aerospace satellites, pumping coolant to the heating area of the mobile phone, and through the vapor-liquid phase change, the heat is conducted at high speed to form a smooth one-way cooling loop. It has a cooling capacity twice that of VC and is the strongest passive cooling system for mobile phones to date. It will be mass-produced in the second half of 2022.
According to reports, the annular cold pump consists of an evaporator, a condenser, a compensation chamber, and steam and liquid pipes. The evaporator is located in the heat source area of the mobile phone motherboard. When the processor and other heat sources are running at high load, the cold liquid evaporates into a vapor state, and the airflow is driven into the steam pipe by natural expansion. When the steam flows into the condenser, it condenses into liquid, is sucked into the liquid pipe by capillary force, and then returns to the compensation chamber to supply the evaporator with cold liquid. This cycle continues without the need for external power.
Lei Jun pointed out that although the phase change principle is the same as VC liquid cooling, the actual effect is very different due to the different structure. Conventional VC liquid cooling cannot separate vapor and liquid, so the hot steam moving to the condenser and the cold liquid returning to the evaporator move in opposite directions and hinder each other, which makes it easy for liquid to reflux under high load conditions. At the same time, due to the special steam pipeline design of the annular cold pump, the airway resistance is greatly reduced by 30%, and the steam circulation is smoother, so that heat can be transported to the cold end in a directional and long-distance manner, increasing the maximum heat transfer power by 100%.
IT Home learned that when talking about the reason why the gas and liquid in the annular cold pump can flow in one direction, Lei Jun said that the most important design is to add a "Tesla valve" structure in the compensation chamber.
The "Tesla Valve" has a similar effect to a one-way valve. When liquid flows forward from the liquid pipeline to the evaporator through the Tesla valve, it is released normally. When steam flows in the opposite direction from the evaporator to the compensator, the special design inside the Tesla valve prevents the steam from flowing back and forth normally, thereby achieving a one-way flow effect and greatly improving the gas-liquid circulation efficiency.
In terms of actual testing, Xiaomi modified a Xiaomi MIX 4 and replaced the heat dissipation part with a ring cold pump. At the same time, it used "Genshin Impact" for a 30-minute test. It can run continuously at full frame at 60 frames + highest picture quality. The maximum temperature of the body is 47.7℃, which is 5℃ lower than the maximum temperature of the ordinary Snapdragon 888 mobile phone, and even has better frame rate heating performance than gaming phones.
Lei Jun mentioned that thanks to the one-way heat flow, gas-liquid separation and low-resistance steam channel design brought by the Tesla valve, the shape of Xiaomi's self-developed annular cold pump can be more flexible and can be stacked in almost any shape inside the fuselage. For example, it can be made into a "mouth" shape, which increases the thickness of the battery through the hollow shape and improves the battery capacity; it can be made into a "convex" shape, while increasing the battery, leaving space for the super-large camera module, and the imagination space for stacking is objective.
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