空氣電磁加熱器影響因素

      1.增大空氣加熱器的氣體入口流速，能夠加強空氣電加熱器對流換熱(re)(re)(re)，而降(jiang)低了空(kong)(kong)氣(qi)加(jia)(jia)熱(re)(re)(re)器內電熱(re)(re)(re)元(yuan)件表面溫度(du)，不僅有(you)利(li)于延長空(kong)(kong)氣(qi)加(jia)(jia)熱(re)(re)(re)器電熱(re)(re)(re)元(yuan)件的(de)使(shi)用壽命，而且使(shi)得空(kong)(kong)氣(qi)電加(jia)(jia)熱(re)(re)(re)器散熱(re)(re)(re)損(sun)失減小，因而空(kong)(kong)氣(qi)換熱(re)(re)(re)器的(de)效率提(ti)(ti)高了，但速度(du)如果過大，使(shi)得壓力(li)損(sun)失陡增，這將不利(li)于加(jia)(jia)熱(re)(re)(re)效率的(de)提(ti)(ti)高。

     2.若(ruo)其它條件(jian)不變(bian)(bian)，改變(bian)(bian)表面(mian)(mian)負(fu)(fu)荷，空(kong)(kong)(kong)氣(qi)(qi)加(jia)熱(re)器(qi)中(zhong)電熱(re)元(yuan)件(jian)的(de)壁(bi)溫將呈直線變(bian)(bian)化，如果表面(mian)(mian)負(fu)(fu)荷增(zeng)大(da)，電熱(re)元(yuan)件(jian)的(de)壁(bi)溫將增(zeng)大(da)，這將降(jiang)低空(kong)(kong)(kong)氣(qi)(qi)加(jia)熱(re)器(qi)中(zhong)電熱(re)元(yuan)件(jian)的(de)使用壽命，但是(shi)如果表面(mian)(mian)負(fu)(fu)荷過(guo)小，壁(bi)溫過(guo)低，空(kong)(kong)(kong)氣(qi)(qi)加(jia)熱(re)器(qi)換熱(re)器(qi)的(de)效率又降(jiang)低了(le)，所以空(kong)(kong)(kong)氣(qi)(qi)加(jia)熱(re)器(qi)中(zhong)電熱(re)元(yuan)件(jian)的(de)表面(mian)(mian)負(fu)(fu)荷的(de)選擇比較重(zhong)要。

     3.空氣(qi)加熱(re)(re)(re)(re)器(qi)中空氣(qi)終溫(wen)T2提高(gao)時(shi)(shi)(shi)，由(you)于空氣(qi)粘性增加，氣(qi)體雷諾數(shu)減(jian)小(xiao)，使得(de)對流換(huan)熱(re)(re)(re)(re)強度降低，空氣(qi)加熱(re)(re)(re)(re)器(qi)中電(dian)熱(re)(re)(re)(re)元(yuan)件(jian)的表面溫(wen)度同(tong)時(shi)(shi)(shi)上升(sheng)，紅外碳(tan)硫分析儀使得(de)散熱(re)(re)(re)(re)損失增加，從而降低換(huan)熱(re)(re)(re)(re)器(qi)的效率。當T2提高(gao)過大時(shi)(shi)(shi)，電(dian)熱(re)(re)(re)(re)元(yuan)件(jian)表面的溫(wen)度亦會大大升(sheng)高(gao)，致使一般電(dian)熱(re)(re)(re)(re)元(yuan)件(jian)無法承(cheng)受，故(gu)T2的增加通常受到空氣(qi)加熱(re)(re)(re)(re)器(qi)中電(dian)熱(re)(re)(re)(re)元(yuan)件(jian)材料耐(nai)熱(re)(re)(re)(re)性能的限制。