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功率散热器自冷热阻估算材料导热系数Ks[W/m.K]208齿宽b[mm]2齿高l[mm]100齿数n[mm]39散热器端面长度B[mm]204散热器长度L[mm]300散热器端面周长S[mm]8160散热器总面积A[cm2]24480散热器与元件接触热阻[K/W]0散热器内固体传热热阻[K/W]0.020545694自冷下散热器与空气传热热阻[K.CM2/W]1200自冷下散热器与空气传热热阻[K/W]0.049019608风速Us[m/s]6风冷下散热器与空气传热热阻[K/W]0.012545246Rzo(自冷下总热阻)[K/W]0.069565301Rzo(风冷下总热阻)[K/W]0.03309094Rzo(总热阻)=Rth(散热器与元件接触热阻)+Rth(散热器内固体传热)+Rthk(散热器与空气间的传热热阻)1KCal=4.182KJ1KCal/(h.m.K)=1.16W/m.KRzo(总热阻)=Rth(散热器与元件接触热阻)+Rth(散热器内固体传热)+Rthk(散热器与空气间的传热热阻)