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)，而(er)降(jiang)低了空(kong)氣加熱(re)器(qi)內電(dian)熱(re)元(yuan)件表面溫度，不(bu)僅有利于延長(chang)空(kong)氣加熱(re)器(qi)電(dian)熱(re)元(yuan)件的(de)(de)使(shi)用壽命(ming)，而(er)且使(shi)得(de)空(kong)氣電(dian)加熱(re)器(qi)散(san)熱(re)損失減小，因而(er)空(kong)氣換熱(re)器(qi)的(de)(de)效率提高了，但速(su)度如(ru)果(guo)過大(da)，使(shi)得(de)壓力損失陡增(zeng)，這將不(bu)利于加熱(re)效率的(de)(de)提高。

     2.若(ruo)其它(ta)條件(jian)(jian)不變，改變表(biao)面(mian)(mian)負(fu)(fu)荷(he)，空(kong)氣(qi)(qi)加熱器(qi)(qi)中(zhong)電熱元件(jian)(jian)的(de)(de)壁溫(wen)(wen)將呈直(zhi)線變化，如(ru)果表(biao)面(mian)(mian)負(fu)(fu)荷(he)增大，電熱元件(jian)(jian)的(de)(de)壁溫(wen)(wen)將增大，這將降(jiang)低空(kong)氣(qi)(qi)加熱器(qi)(qi)中(zhong)電熱元件(jian)(jian)的(de)(de)使用(yong)壽命(ming)，但是如(ru)果表(biao)面(mian)(mian)負(fu)(fu)荷(he)過小，壁溫(wen)(wen)過低，空(kong)氣(qi)(qi)加熱器(qi)(qi)換熱器(qi)(qi)的(de)(de)效率又(you)降(jiang)低了，所以空(kong)氣(qi)(qi)加熱器(qi)(qi)中(zhong)電熱元件(jian)(jian)的(de)(de)表(biao)面(mian)(mian)負(fu)(fu)荷(he)的(de)(de)選擇(ze)比(bi)較重要(yao)。

     3.空(kong)(kong)氣(qi)加(jia)(jia)熱(re)(re)(re)(re)器(qi)中(zhong)空(kong)(kong)氣(qi)終溫T2提(ti)高時，由于(yu)空(kong)(kong)氣(qi)粘性增加(jia)(jia)，氣(qi)體雷(lei)諾數減小，使得對流換熱(re)(re)(re)(re)強度降(jiang)低(di)，空(kong)(kong)氣(qi)加(jia)(jia)熱(re)(re)(re)(re)器(qi)中(zhong)電(dian)熱(re)(re)(re)(re)元(yuan)(yuan)(yuan)件的表面溫度同(tong)時上升，紅外碳硫分析儀(yi)使得散熱(re)(re)(re)(re)損失增加(jia)(jia)，從而降(jiang)低(di)換熱(re)(re)(re)(re)器(qi)的效率。當T2提(ti)高過大(da)(da)時，電(dian)熱(re)(re)(re)(re)元(yuan)(yuan)(yuan)件表面的溫度亦會(hui)大(da)(da)大(da)(da)升高，致使一般電(dian)熱(re)(re)(re)(re)元(yuan)(yuan)(yuan)件無(wu)法承受(shou)(shou)，故T2的增加(jia)(jia)通(tong)常受(shou)(shou)到空(kong)(kong)氣(qi)加(jia)(jia)熱(re)(re)(re)(re)器(qi)中(zhong)電(dian)熱(re)(re)(re)(re)元(yuan)(yuan)(yuan)件材(cai)料耐熱(re)(re)(re)(re)性能的限制(zhi)。