Experimental And Numerical Analysis On Heat Transfer Performance Of Heat Pipe Cooling For IGBT Component

IGBT components are widely used in all aspects of transducers, inverters, train tractorsand they are in the state of opening or closed frequently. The power loss of IGBT is very huge.Cooling effect is relate directly to the stable operation of IGBT element, use security andoperating life, etc. There are many different kinds of methods to cooling IGBT, the heat pipeis an effectually method. At present most researchers concentrate on the heat pipe itself,without regarding other parts (fins, cooling plate) as a whole to research, lack the generalityand applicability in the project. The utility of total heat transfer coefficient is defined. Thetotal heat transfer coefficient k link the power loss of IGBT, the max temperature of coolingplate, the temperature of inlet wind together. The article build a bridge for designing andresearching of the heat pipe via researching the total heat transfer coefficient k withexperimental and numerical analysis in different working conditions and different sizes offins.At first, the article takes BSM10GP120IGBT for example to estimate the heat loss ofIGBT module and analyze the heat transfer resistance of the heat transfer process. Secondly,the whole heat pipe exchanger was divided into two parts. The cooling plate was numericallysimulated. Then the cooling plate’s shape factors of heat conduct of the in different sizes andcircle’s radius for similar engineering applications is obtained. The expression of two parts ofheat exchanger’s heat transfer coefficient is obtained via reaching the heat transfer of wholeheat pipe exchanger. The two expression relate together with the temperature of workingmedium in adiabatic section. The total heat transfer coefficient of whole heat exchanger isobtained. Once again, the article carries on experimental research. Under three heat fluxmeasure the temperature on the cooling plate under different airspeed, the inlet temperatureand pressure, the outlet temperature and pressure. The total heat transfer coefficient andresistance coefficient are abtained. At last, the Icepak software is used for numericalsimulation and analysis of the heat pipe heat exchanger. Keep the spacing of fins is2.0mm,compare and analyze the temperature on the surface of cooling block, heat transfer coefficientof the heat exchanger, coefficient of convective heat transfer of the fins, the inlet pressure, theoutlet pressure,Nu，efficiency of the fins when the fin width is38mm,42mm,46mm,50mm,54mm. Keep the fin width is46mm, compare and analyze the temperature on the surface ofcooling plate, heat transfer coefficient, coefficient of convective heat exchanger of the fins,the inlet pressure, the outlet pressure, Nu，efficiency of the fins when the spacing of fins is2mm,2.3mm,2.6mm,2.9mm,3.2mm.The major results of the study are: the cooling plate’s shape factors in different sizes areobtained: 1)The cooling plate’s shape factors appear regularity that the shape factor decrease withthickness of cooling plate and increase with radius.2)The heat transfer coefficient and the flow resistance of heat pipe exchanger underdifferent wind speed are obtained. When the inlet wind speed is low, the trend of temperaturedecreasing is bigger than the trend of pressure differential increasing; When the inlet windspeed is high, the trend of temperature decreasing is smaller than the trend of pressuredifferential increasing.3)Numerical simulation result shows that in a given fins space, wind speed and heatpower, the temperature of the cooling plate decrease with the fin width increasing, with amore and more gentle trend. The heat transfer coefficient increase with the fin widthincreasing, the pressure differential increase with the fins width increasing with a more andmore obvious trend.4) Numerical simulation result shows that in a given fins width, the temperature of thecooling plate decrease with the fin space decreasing with a more and more gentle trend. Theheat transfer coefficient increase with the fin width increasing, the pressure differentialincrease with the fins space decreasing with a more and more obvious trend.