?z??*zc?0.167?1619.62??0.6*144?12?1.111?0.167?1187.71wm2*k
0.002545.3（6）求K. 因AA0?0.0250.0225 A0?0.025Ai0.02?1.25 ????
p查表4-4 取Rf=0.00018 Roil=0
?1?pA0?1?A0?所以 K?? ??????R?f??A?w?Ai????z?p =
?1?10.00251???1.111??0.00018??45.38464.26??1187.71=783.73 W/㎡*k
????1.25? ???1(7)求A实
A实??kk*?t?77.4?103783.73?6.3815.48m
2因为A实=15.48㎡>14.4㎡ 不够用重选18㎡
（8）校验A=18㎡的各参数
A’=18㎡ N=127根 z=0.6*1272=6.76 h=16 所以 vw?Mw?127*?6.162??41Aw160.80.2?0.02??10002?2.47ms
?w??*v而
?2167??i2.470.021030.80.2?9768.11wm2*k?'??kA'?77.4?18?4300wm2
1?2078817.5?10所以??0.065??4300?0.025?z6????3??0.6?127?12?0.167?1267.94wm2*k
?1??10.00251??K???1.1111??0.00018???1.25??45.39768.11???1267.94? =831.28w/㎡*k
所以A??kk*?t?77400831.28?6.3814.59m2?18m
2 故够用
??k*?t?831.28?6.38?5303.6w/m2
（9）面积余量
18?14.5914.59?23.37%