Research On Heat Pipe Enhanced Heat Transfer Based On Low Energy Consumption Of Server Cabinet

Internal temperature and humidity ensure a risk-free operation of the server,with the cabinet as the load-bearing unit of the latter.Given the continuous enhancement of the computing power of the server,the problem of heat dissipation seriously threatens the safe operation of the equipment.Traditional cabinet heat dissipation cannot meet the requirements for a safe operation of the server.Heat pipes are widely used to solve the problem of heat dissipation in high-power components with excellent thermal conductivity.Due to the heat pipe does not need the power drive,it can greatly reduce the power consumption of heat dissipation in the communication rooms.In this paper,a heat pipe is installed on the cabinet for actual heat dissipation.Based on this,the performance of several other heat pipes is studied,and a heat pipe with the better heat transfer performance is obtained.First of all,the start-up performance of copper water heat pipe and steel water heat pipe with the same structure is studied,and the conclusion is that the start-up performance of copper water heat pipe is better.Taking the copper water heat pipe as the experimental object,the heat transfer performance of a single bent copper water heat pipe at different evaporating temperature（30-40℃）and different condensing wind speed（1-5 m/s）is tested.The results show that the heat transfer performance of the heat pipe intensifies with the increase of evaporating temperature and wind speed.Ten bent copper water heat pipes were installed on the top of the cabinet in two ways:single row arrangement and cross-arrangement.The experimental outcome shows that the average temperature inside the cabinet is significantly reduced once heat pipes have been installed.Moreover,the internal temperature of the cabinet is the lowest and the heat dissipation effect is more efficacious when the heat pipes are cross-arranged.Secondly,in order to enhance the heat transfer effect of a single heat pipe,an elliptical loop heat pipe is designed.The heat transfer performance of the elliptical loop heat pipe in different vacuum degrees(1×10^-2Pa,1×10^-3Pa,1×10^-4Pa)and different liquid filling rates（30%,50%,60%）is studied.The results show that the higher the vacuum degree,the better the heat transfer performance of the heat pipe.The heat transfer performance of the heat pipe is the better when the liquid filling rate is 50%,while the least productive performance occurs when the liquid filling rate is 30%;The maximum equivalent thermal conductivity is15753.32 W/（m·K）..In addition,an ultra-thin micro channel flat heat pipe is selected.In order to facilitate the installation of flat heat pipes on the cabinet,it is bent into three bending angles:180°,135°,and 90°.The heat transfer performance of the heat pipe under three different bending angles and different condensing wind speeds（2 m/s,3 m/s,5 m/s,8 m/s）was studied.The experimental results show that the heat transfer performance is optimal when the bending angle is 180°and ineffectual when the bending angle is 90°.With the increase of wind speed,the heat transfer performance of the heat pipe is boosted,although the average temperature of the heat pipe drops.Finally,the heat transfer performances of the bent copper water heat pipe,elliptical loop heat pipe,and 135°bend angle ultra-thin micro channel flat heat pipe are compared.The results show that the bent copper water heat pipe has the worst average temperature and the smallest heat transfer capacity（13.17 W）;the flat heat pipe presents the best average temperature and the largest heat transfer capacity（16.96 W）.In summary,the copper water heat pipe is installed on the cabinet for actual heat dissipation.On this basis,in order to improve the heat transfer performance of single heat pipe,the heat transfer performance of elliptical loop heat pipe and ultra-thin micro channel flat heat pipe is studied.By comparing the heat transfer performance of the three kinds of heat pipes,it is concluded that the heat transfer performance of the ultra-thin micro channel flat heat pipe is the best.