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　　翅片管束管外放熱和阻力實驗

　　測試數據

　　表1 測試數據表

　　測試次數動壓頭(Pa)靜壓(Pa)空氣溫度（℃）熱電偶測熱管蒸汽溫度—

　　—讀數（mV）箱溫(mV)電壓（V）電流（A）ΔPHtitot1t2t3t4t5100359.713.93.9983.6413.054.7840.3452485.89200509.812.73.7143.2122.6384.4430.3482485.9300909.912.33.5652.9372.3944.2440.3582485.914001109.811.93.4742.7862.264.1320.3582485.915001401011.73.4082.6822.1684.0530.3812485.916001609.811.43.3572.5912.0823.9850.3852485.91

　　物性參數的確定

　　管內蒸汽溫度的確定

　　表2 試驗管內蒸汽平均溫度

　　熱電偶測管內蒸汽溫度——讀數（mV）t1t2t3t4tm蒸汽溫度(℃)3.9983.6413.054.7843.86890.93.7143.2122.6384.4433.50282.93.5652.9372.3944.2443.28578.13.4742.7862.264.1323.16375.43.4082.6822.1684.0533.07873.53.3572.5912.0823.9853.00471.9

　　空氣平均溫度及空氣參數的確定

　　測試次數空氣溫度（℃）空氣物性參數入口出口平均溫度tf密度(kg/m3)出口處密度(kg/m3)比熱(J/kg.K)導熱系數(W/m.K)運動粘度(m2/s)19.713.911.81.2391.231 1005.00 0.0252 1.43E-059.812.711.251.2421.236 1005.00 0.0252 1.43E-059.912.311.11.2421.237 1005.00 0.0252 1.43E-059.811.910.851.2431.239 1005.00 0.0252 1.42E-051011.710.851.2431.240 1005.00 0.0252 1.42E-059.811.410.61.2441.241 1005.00 0.0251 1.42E-05

實驗數據的整理計算

　　計算風速和風量

　　表3 風速和風量計算表

　　測試次數動壓頭（Pa）測速處風速(m/s)風量 Ma(kg/s)測速外流道截面積(m2)空氣側吸熱量 （W）110012.700.380.0241583.63220017.950.531551.27330021.980.651574.08440025.360.751591.88550028.360.841441.74660031.050.921487.33其中，空氣側吸熱量：

　　電加熱器功率

加熱器箱體散熱

　　因箱體溫度很低，散熱量小，可由自然對流計算，其中，自然對流散熱系數近似取5W/m2.℃。

表4 加熱器箱體散熱量

　　測試次數箱 溫環境溫度(℃)箱體散熱面積箱體散熱量（W）讀數（mV）溫度(℃)0.3458.58.44*0.58*0.32=

　　0.74240.370.3488.98.41.860.3589.28.42.970.3589.28.42.970.3819.78.44.830.3859.88.45.2

　　計算熱平衡誤差

表5 熱平衡誤差表

　　空氣側吸熱量Q1箱體散熱量Q3功率(W) Q2熱平衡誤差%1583.630.371460.77.78451551.271.861463.25.79691574.082.971465.77.0751591.882.971465.78.1141441.744.831465.7-1.3251487.335.21465.71