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)，而(er)降低了空(kong)氣加熱(re)(re)器內電熱(re)(re)元(yuan)件(jian)表面溫度，不僅(jin)有(you)利(li)(li)于(yu)延長空(kong)氣加熱(re)(re)器電熱(re)(re)元(yuan)件(jian)的(de)(de)使(shi)(shi)用壽命，而(er)且使(shi)(shi)得(de)空(kong)氣電加熱(re)(re)器散熱(re)(re)損失減(jian)小，因而(er)空(kong)氣換熱(re)(re)器的(de)(de)效率(lv)提高了，但速度如果過大，使(shi)(shi)得(de)壓力損失陡增，這將不利(li)(li)于(yu)加熱(re)(re)效率(lv)的(de)(de)提高。

     2.若其它(ta)條(tiao)件(jian)不變，改(gai)變表(biao)面(mian)(mian)(mian)負荷(he)，空(kong)氣(qi)加(jia)熱(re)器(qi)中(zhong)電(dian)(dian)熱(re)元(yuan)(yuan)(yuan)件(jian)的(de)壁(bi)(bi)溫將(jiang)(jiang)呈直線變化，如(ru)果表(biao)面(mian)(mian)(mian)負荷(he)增大，電(dian)(dian)熱(re)元(yuan)(yuan)(yuan)件(jian)的(de)壁(bi)(bi)溫將(jiang)(jiang)增大，這將(jiang)(jiang)降低(di)空(kong)氣(qi)加(jia)熱(re)器(qi)中(zhong)電(dian)(dian)熱(re)元(yuan)(yuan)(yuan)件(jian)的(de)使用壽命，但是如(ru)果表(biao)面(mian)(mian)(mian)負荷(he)過(guo)小，壁(bi)(bi)溫過(guo)低(di)，空(kong)氣(qi)加(jia)熱(re)器(qi)換熱(re)器(qi)的(de)效率又降低(di)了，所以空(kong)氣(qi)加(jia)熱(re)器(qi)中(zhong)電(dian)(dian)熱(re)元(yuan)(yuan)(yuan)件(jian)的(de)表(biao)面(mian)(mian)(mian)負荷(he)的(de)選擇比較重要。

     3.空(kong)(kong)氣(qi)加(jia)熱(re)(re)(re)器中(zhong)空(kong)(kong)氣(qi)終溫(wen)T2提(ti)高(gao)時，由于空(kong)(kong)氣(qi)粘性(xing)增(zeng)加(jia)，氣(qi)體雷諾數減小，使(shi)(shi)得對流(liu)換熱(re)(re)(re)強度降(jiang)低，空(kong)(kong)氣(qi)加(jia)熱(re)(re)(re)器中(zhong)電(dian)熱(re)(re)(re)元(yuan)件的(de)(de)表面溫(wen)度同時上升(sheng)，紅外碳硫分析儀使(shi)(shi)得散熱(re)(re)(re)損失增(zeng)加(jia)，從而降(jiang)低換熱(re)(re)(re)器的(de)(de)效率。當T2提(ti)高(gao)過大(da)時，電(dian)熱(re)(re)(re)元(yuan)件表面的(de)(de)溫(wen)度亦會大(da)大(da)升(sheng)高(gao)，致使(shi)(shi)一般(ban)電(dian)熱(re)(re)(re)元(yuan)件無(wu)法承受，故T2的(de)(de)增(zeng)加(jia)通常(chang)受到空(kong)(kong)氣(qi)加(jia)熱(re)(re)(re)器中(zhong)電(dian)熱(re)(re)(re)元(yuan)件材料耐熱(re)(re)(re)性(xing)能的(de)(de)限(xian)制。