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(liu)換(huan)熱(re),而降低(di)了(le)空氣(qi)加(jia)熱(re)器內電(dian)熱(re)元件表(biao)面溫度,不(bu)僅(jin)有(you)利于(yu)延(yan)長空氣(qi)加(jia)熱(re)器電(dian)熱(re)元件的使用(yong)壽命,而且使得空氣(qi)電(dian)加(jia)熱(re)器散(san)熱(re)損失(shi)減(jian)小,因而空氣(qi)換(huan)熱(re)器的效率提(ti)(ti)高(gao)了(le),但速度如果過大(da),使得壓力損失(shi)陡增(zeng),這將不(bu)利于(yu)加(jia)熱(re)效率的提(ti)(ti)高(gao)。
2.若其它(ta)條(tiao)件(jian)(jian)(jian)(jian)不變(bian)(bian),改變(bian)(bian)表(biao)(biao)(biao)面負(fu)荷(he),空(kong)(kong)(kong)氣加(jia)熱(re)(re)(re)器(qi)(qi)中電(dian)(dian)熱(re)(re)(re)元件(jian)(jian)(jian)(jian)的(de)(de)壁(bi)溫(wen)將(jiang)(jiang)呈(cheng)直(zhi)線變(bian)(bian)化,如(ru)果表(biao)(biao)(biao)面負(fu)荷(he)增大,電(dian)(dian)熱(re)(re)(re)元件(jian)(jian)(jian)(jian)的(de)(de)壁(bi)溫(wen)將(jiang)(jiang)增大,這(zhe)將(jiang)(jiang)降(jiang)低(di)空(kong)(kong)(kong)氣加(jia)熱(re)(re)(re)器(qi)(qi)中電(dian)(dian)熱(re)(re)(re)元件(jian)(jian)(jian)(jian)的(de)(de)使用壽命,但是如(ru)果表(biao)(biao)(biao)面負(fu)荷(he)過小,壁(bi)溫(wen)過低(di),空(kong)(kong)(kong)氣加(jia)熱(re)(re)(re)器(qi)(qi)換熱(re)(re)(re)器(qi)(qi)的(de)(de)效率又降(jiang)低(di)了(le),所(suo)以空(kong)(kong)(kong)氣加(jia)熱(re)(re)(re)器(qi)(qi)中電(dian)(dian)熱(re)(re)(re)元件(jian)(jian)(jian)(jian)的(de)(de)表(biao)(biao)(biao)面負(fu)荷(he)的(de)(de)選擇比較重要。
3.空氣(qi)(qi)加(jia)(jia)(jia)熱(re)(re)(re)器(qi)中(zhong)空氣(qi)(qi)終溫T2提高時,由于空氣(qi)(qi)粘性增(zeng)(zeng)加(jia)(jia)(jia),氣(qi)(qi)體雷諾(nuo)數減小,使(shi)得對(dui)流換熱(re)(re)(re)強(qiang)度降(jiang)低(di),空氣(qi)(qi)加(jia)(jia)(jia)熱(re)(re)(re)器(qi)中(zhong)電(dian)熱(re)(re)(re)元件的(de)(de)表(biao)面溫度同時上升(sheng),紅外(wai)碳硫分析儀使(shi)得散熱(re)(re)(re)損(sun)失(shi)增(zeng)(zeng)加(jia)(jia)(jia),從(cong)而降(jiang)低(di)換熱(re)(re)(re)器(qi)的(de)(de)效率。當T2提高過大(da)時,電(dian)熱(re)(re)(re)元件表(biao)面的(de)(de)溫度亦(yi)會大(da)大(da)升(sheng)高,致使(shi)一般電(dian)熱(re)(re)(re)元件無法承受,故T2的(de)(de)增(zeng)(zeng)加(jia)(jia)(jia)通常受到空氣(qi)(qi)加(jia)(jia)(jia)熱(re)(re)(re)器(qi)中(zhong)電(dian)熱(re)(re)(re)元件材料耐(nai)熱(re)(re)(re)性能的(de)(de)限制。