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(dui)流換熱(re)(re)(re)(re)，而降低了空(kong)氣加熱(re)(re)(re)(re)器內電熱(re)(re)(re)(re)元件表面溫(wen)度，不僅(jin)有(you)利于延長空(kong)氣加熱(re)(re)(re)(re)器電熱(re)(re)(re)(re)元件的(de)使(shi)(shi)用(yong)壽命(ming)，而且使(shi)(shi)得空(kong)氣電加熱(re)(re)(re)(re)器散熱(re)(re)(re)(re)損(sun)失減小，因而空(kong)氣換熱(re)(re)(re)(re)器的(de)效(xiao)率(lv)提高了，但速(su)度如果過(guo)大，使(shi)(shi)得壓力損(sun)失陡增(zeng)，這將不利于加熱(re)(re)(re)(re)效(xiao)率(lv)的(de)提高。

     2.若其它條件(jian)(jian)(jian)不變，改(gai)變表面(mian)負(fu)荷，空(kong)氣(qi)加熱(re)器中電(dian)熱(re)元(yuan)件(jian)(jian)(jian)的壁溫(wen)(wen)(wen)將呈直線變化，如果(guo)表面(mian)負(fu)荷增大，電(dian)熱(re)元(yuan)件(jian)(jian)(jian)的壁溫(wen)(wen)(wen)將增大，這將降低空(kong)氣(qi)加熱(re)器中電(dian)熱(re)元(yuan)件(jian)(jian)(jian)的使用壽(shou)命，但是如果(guo)表面(mian)負(fu)荷過小，壁溫(wen)(wen)(wen)過低，空(kong)氣(qi)加熱(re)器換熱(re)器的效(xiao)率又(you)降低了，所以空(kong)氣(qi)加熱(re)器中電(dian)熱(re)元(yuan)件(jian)(jian)(jian)的表面(mian)負(fu)荷的選擇(ze)比較重(zhong)要。

     3.空(kong)氣(qi)(qi)加(jia)熱(re)器中(zhong)空(kong)氣(qi)(qi)終溫T2提高時(shi)，由(you)于空(kong)氣(qi)(qi)粘性增(zeng)(zeng)加(jia)，氣(qi)(qi)體(ti)雷諾數減(jian)小，使得對流換(huan)熱(re)強度降(jiang)低(di)(di)，空(kong)氣(qi)(qi)加(jia)熱(re)器中(zhong)電(dian)熱(re)元(yuan)(yuan)件的(de)表面溫度同時(shi)上升，紅(hong)外碳硫分(fen)析儀使得散熱(re)損(sun)失增(zeng)(zeng)加(jia)，從而降(jiang)低(di)(di)換(huan)熱(re)器的(de)效率。當T2提高過大時(shi)，電(dian)熱(re)元(yuan)(yuan)件表面的(de)溫度亦會大大升高，致使一般(ban)電(dian)熱(re)元(yuan)(yuan)件無法承受，故T2的(de)增(zeng)(zeng)加(jia)通常受到空(kong)氣(qi)(qi)加(jia)熱(re)器中(zhong)電(dian)熱(re)元(yuan)(yuan)件材料(liao)耐熱(re)性能的(de)限制。