功率散热器自冷热阻估算
材料导热系数Ks[W/m.K]齿宽b[mm]齿高l[mm]齿数n[mm]散热器端面长度B[mm]散热器长度L[mm]散热器端面周长S[mm]散热器总面积A[cm2]散热器与元件接触热阻[K/W]散热器内固体传热热阻[K/W]自冷下散热器与空气传热热阻[K.CM2/W]自冷下散热器与空气传热热阻[K/W]风速Us[m/s]风冷下散热器与空气传热热阻[K/W]Rzo(自冷下总热阻)[K/W]Rzo(风冷下总热阻)[K/W]20821003920430081602448000.02054569412000.04901960860.0125452460.0695653010.03309094Rzo(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.K
