Research On Enhanced Heat Dissipation And Waste Heat Recovery With Micro Heat Pipes Flat Array In Data Room

In 2021,the development of the digital economy shows obviously acceleration,the cloud computing business has increased production by more than 90% over the previous year.In this context,optimizing the heat dissipation process of data servers and effectively recycling waste heat for utilization are the key directions for reducing energy consumption in data center.This paper studies the enhanced heat dissipation and waste heat recovery of the data center based on the phase-change heat process of the flat plate micro heat pipe array(referred to as "MHPA").In the research,the ANSYS finite element simulation technology is applied and the thermal environment parameters of the data room are used as the boundary conditions to study the three factors that affect the heat transfer of MHPA unit,which aims to obtain a better heat transfer condition.On this basis,an enhanced heat dissipation module is constructed with MHPA as the core component,and the research is carried out in the form of a combination of numerical simulation and experimental measurement:(1)Run the numerical simulation of the heat transfer process in the "aluminum & methanol" MHPA unit based on the VOF model.The analysis and simulation results show that factors such as liquid filling rate,pipe section position and section shape will affect the heat exchange performance of MHPA unit;the overall heat exchange process in the heat unit is better when the liquid filling rate is around 35%～40%;appropriately moving the evaporation section or the condensation section has an obvious influence on the phase change cycle of the working medium;the heat transfer effect of MHPA unit without grooves is better than that of other micro heat pipe units with complex cross-sectional shapes.(2)Design an enhanced heat dissipation module built with MHPA as the core component,its operating conditions under the data cabinet are simulated by Fluent software in order to obtain the structure with better airflow organization and heat dissipation effect.According to the measured thermal environment parameters,the cabinets are partitioned and numbered as 1,2,and 3,the operation situation of module in different partitions is studied.Analysis shows that the module has a higher heat exchange in partition 2;The outlet air temperature in partition 1 and 3 is relatively high;the installation position of the module can be flexibly adjusted according to actual needs.An equal-size test platform was built to measure the outlet air temperature of the module and compare it with the simulation results to determine the accuracy of the numerical simulation.(3)Establish a waste heat recovery system and divide the working conditions in winter and summer.Use natural water resources and air-water heat exchangers to recover the waste heat in the exhaust air flowing through the enhanced cooling module in the data room.The recovered waste heat is used to assist heating data park facilities.Through the analysis,the heat recovery and energy saving of the system can be obtained.