Cleanliness test of cold plate liquid cooling system: particle counting method
Cleanliness test of cold plate liquid cooling system: particle counting method
Cold plate liquid cooling system
Liquid cooling by cold plate refers to a form of heat transfer in which the heat of a heating device is indirectly transferred to a cooling liquid in a closed loop by a cold plate (usually a closed cavity made of heat-conducting metals such as copper and aluminum), and the heat is carried away by the cooling liquid.
As a form of non-contact liquid cooling, cold plate liquid cooling is characterized by high integration, high heat dissipation efficiency, quiet energy saving, and high maturity. It is one of the effective means to solve the deployment of high-power equipment, improve energy efficiency, reduce cooling costs, and reduce TCO.
Cold plate liquid cooling system schematic
Effect of particle cleanliness on cold plate liquid cooling system
Particle cleanliness is very important for the cold plate liquid cooling system, which is directly related to the heat dissipation efficiency of the system, long-term operation reliability, equipment life and maintenance cost. Excessive particle cleanliness will lead to flow channel blockage, accelerated corrosion, pump wear, heat resistance increase and other problems.
- Flow channel blockage:
Particulates are deposited in narrow cold plate microchannels, filters, valves or pump inlets, resulting in reduced flow.
The decrease of traffic directly causes the heat dissipation capacity to decrease sharply, and the chip temperature rises, which may trigger overheating protection or even damage.
- Increased resistance:
Particles deposit on the contact interface (TIM interface) between the cold plate and the chip or on the wall of the cold plate flow channel, forming an insulating layer that hinders heat transfer.
- Wear key components:
Hard particles will wear the impeller, bearing and seal of the pump, resulting in reduced pump efficiency, leakage or even failure.
May damage precision components such as flow meters and valves.
How to check particle cleanliness？
Particle cleanliness detection is the core link of cleanliness management in liquid-cooled cold plate system. At present, the mainstream detection method is particle counting method.
The particle counting method serves as the cornerstone for evaluating component and fluid cleanliness. Through standardized procedures for contaminant collection, filtration, and particle analysis, it provides critical quantitative data on the quantity and size of solid particulate contaminants. Strictly defined by major standards such as ISO and VDA, this method is widely applied in industries including automotive, aerospace, hydraulics, precision manufacturing, and thermal management. It stands as a vital tool for controlling product quality, predicting equipment wear, and ensuring system reliability.
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