Application And Performance Optimization Of Water-Cooling Heat Pipe Radiator In The Server

With the rapid development of information society, the construction of data center continues to increase. However, there is a big energy consumption and cooling limitation of cooling system in the data center. In order to meet the requirements of the high heat flux density server, proposing a water-cooling heat pipe radiator. Through the heat pipe, the internal heat in server was export to the external cold plate. Then the cold plate was cooled by the cooling water in data center’s pipe system.The manufacturing method and specific process of this radiator is described in this paper. It is analyzed the composition of the thermal resistance of the structure of the radiator. And found the thermal resistance of heat pipe and cold plate are key parameters to affect the performance of radiator. For the heat pipe, we found the changing rule of the maximum heat transfer power, thermal resistance and temperature range by comparing the different wick structure and liquid injection rate. For gravity assisted long heat pipe, the wick structure of high permeability and small liquid flow resistance should be a better selection. In liquid injection rate of 80%- 160%, the maximum heat transfer power of the heat pipe increase with the increase of liquid injection rate. Higher liquid injection rate make liquid blocking in the end of heat pipe condensing section, and it results in higher thermal resistance. Therefore, under the premise of meeting the heat transfer power requirement, low liquid injection rate should be chosen. In the cool range of 10℃-50℃, the maximum heat transfer power of heat pipe decreased with the decreasing of temperature. Due to the low temperature, working medium viscosity increase and working medium flow resistance increase. So it has a very small maximum heat transfer power when the cooling water is in 10℃. For cold plate, the fluent software is used to compare the three different flow structure of cold plate. The temperature distribution and flow pressure loss are in comparison. Found that flow structure with series-parallel structure has better heat transfer effect and smaller flow resistance than series structure.Finally, tested the optimized water-cooling heat pipe radiator in the actual server application situation, and comparing with the air-cooling radiator. In the experiments, when the environment temperature is 25℃, using water-cooling heat pipe radiator can reduce the CPU temperature of 20 ℃ than the air-cooling server. The total thermal resistance for the water cooling heat pipe radiator is 0.0843℃/W.Through the above analysis, found that the water-cooling heat pipe radiator can cooling the server effectively, and running well in actual application. The prototype has operate reliably. The radiator put forward a feasible method to improve the cooling efficiency of Internet Data Center.