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)(re)，而降低(di)了(le)空(kong)(kong)氣(qi)(qi)加(jia)熱(re)(re)(re)(re)器(qi)內電熱(re)(re)(re)(re)元(yuan)件(jian)表面(mian)溫度，不僅有利于(yu)延長(chang)空(kong)(kong)氣(qi)(qi)加(jia)熱(re)(re)(re)(re)器(qi)電熱(re)(re)(re)(re)元(yuan)件(jian)的(de)使用(yong)壽命(ming)，而且使得空(kong)(kong)氣(qi)(qi)電加(jia)熱(re)(re)(re)(re)器(qi)散(san)熱(re)(re)(re)(re)損(sun)失(shi)減小，因而空(kong)(kong)氣(qi)(qi)換熱(re)(re)(re)(re)器(qi)的(de)效率提高了(le)，但(dan)速(su)度如果(guo)過大，使得壓(ya)力損(sun)失(shi)陡增(zeng)，這將不利于(yu)加(jia)熱(re)(re)(re)(re)效率的(de)提高。

     2.若(ruo)其它條(tiao)件(jian)(jian)不變，改變表(biao)面(mian)(mian)負(fu)荷，空氣(qi)加熱(re)(re)器(qi)(qi)(qi)中(zhong)電熱(re)(re)元件(jian)(jian)的壁(bi)溫將呈直線變化，如(ru)果(guo)表(biao)面(mian)(mian)負(fu)荷增大，電熱(re)(re)元件(jian)(jian)的壁(bi)溫將增大，這(zhe)將降(jiang)低(di)空氣(qi)加熱(re)(re)器(qi)(qi)(qi)中(zhong)電熱(re)(re)元件(jian)(jian)的使(shi)用壽命，但(dan)是(shi)如(ru)果(guo)表(biao)面(mian)(mian)負(fu)荷過小，壁(bi)溫過低(di)，空氣(qi)加熱(re)(re)器(qi)(qi)(qi)換熱(re)(re)器(qi)(qi)(qi)的效率又降(jiang)低(di)了(le)，所以(yi)空氣(qi)加熱(re)(re)器(qi)(qi)(qi)中(zhong)電熱(re)(re)元件(jian)(jian)的表(biao)面(mian)(mian)負(fu)荷的選擇(ze)比較重要。

     3.空(kong)氣(qi)(qi)(qi)加(jia)熱(re)(re)(re)器中(zhong)(zhong)空(kong)氣(qi)(qi)(qi)終溫(wen)T2提高時(shi)，由于空(kong)氣(qi)(qi)(qi)粘性增加(jia)，氣(qi)(qi)(qi)體雷(lei)諾數減小，使(shi)得(de)(de)對流換熱(re)(re)(re)強度降(jiang)(jiang)低，空(kong)氣(qi)(qi)(qi)加(jia)熱(re)(re)(re)器中(zhong)(zhong)電(dian)熱(re)(re)(re)元(yuan)件的(de)(de)表(biao)面(mian)溫(wen)度同時(shi)上升，紅外碳硫分(fen)析儀使(shi)得(de)(de)散熱(re)(re)(re)損失增加(jia)，從而降(jiang)(jiang)低換熱(re)(re)(re)器的(de)(de)效率。當T2提高過大(da)(da)時(shi)，電(dian)熱(re)(re)(re)元(yuan)件表(biao)面(mian)的(de)(de)溫(wen)度亦會大(da)(da)大(da)(da)升高，致(zhi)使(shi)一般電(dian)熱(re)(re)(re)元(yuan)件無法承受，故T2的(de)(de)增加(jia)通常受到空(kong)氣(qi)(qi)(qi)加(jia)熱(re)(re)(re)器中(zhong)(zhong)電(dian)熱(re)(re)(re)元(yuan)件材料耐熱(re)(re)(re)性能(neng)的(de)(de)限制。