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(er)降低(di)了(le)空(kong)氣(qi)(qi)加(jia)(jia)熱(re)(re)(re)器內電(dian)(dian)熱(re)(re)(re)元(yuan)件(jian)表面溫度(du)，不僅(jin)有利(li)于(yu)延長空(kong)氣(qi)(qi)加(jia)(jia)熱(re)(re)(re)器電(dian)(dian)熱(re)(re)(re)元(yuan)件(jian)的使(shi)用(yong)壽(shou)命(ming)，而(er)且使(shi)得(de)空(kong)氣(qi)(qi)電(dian)(dian)加(jia)(jia)熱(re)(re)(re)器散(san)熱(re)(re)(re)損失(shi)減(jian)小，因而(er)空(kong)氣(qi)(qi)換熱(re)(re)(re)器的效(xiao)率提高(gao)了(le)，但(dan)速(su)度(du)如果(guo)過大，使(shi)得(de)壓力損失(shi)陡(dou)增，這將(jiang)不利(li)于(yu)加(jia)(jia)熱(re)(re)(re)效(xiao)率的提高(gao)。

     2.若其它條件(jian)(jian)不變(bian)，改變(bian)表(biao)面(mian)(mian)負(fu)荷(he)，空(kong)氣(qi)加(jia)熱(re)(re)(re)器(qi)(qi)(qi)中電熱(re)(re)(re)元件(jian)(jian)的(de)(de)壁溫(wen)將(jiang)呈直線(xian)變(bian)化，如(ru)果表(biao)面(mian)(mian)負(fu)荷(he)增大，電熱(re)(re)(re)元件(jian)(jian)的(de)(de)壁溫(wen)將(jiang)增大，這將(jiang)降低(di)(di)空(kong)氣(qi)加(jia)熱(re)(re)(re)器(qi)(qi)(qi)中電熱(re)(re)(re)元件(jian)(jian)的(de)(de)使用壽命(ming)，但是(shi)如(ru)果表(biao)面(mian)(mian)負(fu)荷(he)過(guo)(guo)小，壁溫(wen)過(guo)(guo)低(di)(di)，空(kong)氣(qi)加(jia)熱(re)(re)(re)器(qi)(qi)(qi)換熱(re)(re)(re)器(qi)(qi)(qi)的(de)(de)效率又降低(di)(di)了(le)，所(suo)以空(kong)氣(qi)加(jia)熱(re)(re)(re)器(qi)(qi)(qi)中電熱(re)(re)(re)元件(jian)(jian)的(de)(de)表(biao)面(mian)(mian)負(fu)荷(he)的(de)(de)選擇(ze)比較重(zhong)要。

     3.空氣(qi)加(jia)(jia)熱器(qi)中(zhong)空氣(qi)終溫T2提高(gao)時(shi)(shi)，由于空氣(qi)粘(zhan)性(xing)增(zeng)加(jia)(jia)，氣(qi)體雷諾數減小，使(shi)得對流換熱強度降(jiang)低，空氣(qi)加(jia)(jia)熱器(qi)中(zhong)電(dian)(dian)熱元件(jian)的(de)表面溫度同時(shi)(shi)上(shang)升，紅外碳硫分析儀使(shi)得散熱損失增(zeng)加(jia)(jia)，從(cong)而(er)降(jiang)低換熱器(qi)的(de)效率。當T2提高(gao)過大時(shi)(shi)，電(dian)(dian)熱元件(jian)表面的(de)溫度亦(yi)會大大升高(gao)，致使(shi)一般(ban)電(dian)(dian)熱元件(jian)無(wu)法承受，故T2的(de)增(zeng)加(jia)(jia)通常受到空氣(qi)加(jia)(jia)熱器(qi)中(zhong)電(dian)(dian)熱元件(jian)材(cai)料耐熱性(xing)能的(de)限制。