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)(er)降低了(le)空(kong)氣(qi)加(jia)熱(re)(re)(re)器內電(dian)熱(re)(re)(re)元件(jian)表(biao)面溫度，不(bu)僅有利于延長空(kong)氣(qi)加(jia)熱(re)(re)(re)器電(dian)熱(re)(re)(re)元件(jian)的(de)使用壽命，而(er)(er)且使得空(kong)氣(qi)電(dian)加(jia)熱(re)(re)(re)器散熱(re)(re)(re)損失減(jian)小，因而(er)(er)空(kong)氣(qi)換熱(re)(re)(re)器的(de)效(xiao)率(lv)提高(gao)(gao)了(le)，但速(su)度如果過大，使得壓力損失陡增，這(zhe)將不(bu)利于加(jia)熱(re)(re)(re)效(xiao)率(lv)的(de)提高(gao)(gao)。

     2.若其它條件不變，改變表(biao)面(mian)(mian)負(fu)荷，空氣加(jia)熱(re)(re)(re)(re)器(qi)中(zhong)電(dian)(dian)熱(re)(re)(re)(re)元(yuan)件的(de)(de)壁溫將呈直(zhi)線(xian)變化(hua)，如果(guo)(guo)表(biao)面(mian)(mian)負(fu)荷增大(da)，電(dian)(dian)熱(re)(re)(re)(re)元(yuan)件的(de)(de)壁溫將增大(da)，這將降(jiang)低(di)空氣加(jia)熱(re)(re)(re)(re)器(qi)中(zhong)電(dian)(dian)熱(re)(re)(re)(re)元(yuan)件的(de)(de)使(shi)用壽命，但是如果(guo)(guo)表(biao)面(mian)(mian)負(fu)荷過小，壁溫過低(di)，空氣加(jia)熱(re)(re)(re)(re)器(qi)換熱(re)(re)(re)(re)器(qi)的(de)(de)效率(lv)又降(jiang)低(di)了，所以空氣加(jia)熱(re)(re)(re)(re)器(qi)中(zhong)電(dian)(dian)熱(re)(re)(re)(re)元(yuan)件的(de)(de)表(biao)面(mian)(mian)負(fu)荷的(de)(de)選擇(ze)比較重要。

     3.空(kong)(kong)氣(qi)加(jia)(jia)(jia)熱(re)器中(zhong)空(kong)(kong)氣(qi)終溫(wen)T2提(ti)高時，由于空(kong)(kong)氣(qi)粘性增加(jia)(jia)(jia)，氣(qi)體雷諾數減(jian)小，使得(de)對流換熱(re)強(qiang)度降(jiang)低，空(kong)(kong)氣(qi)加(jia)(jia)(jia)熱(re)器中(zhong)電(dian)(dian)熱(re)元(yuan)件(jian)(jian)(jian)(jian)的表面溫(wen)度同時上升，紅外碳硫分析儀(yi)使得(de)散熱(re)損失(shi)增加(jia)(jia)(jia)，從而降(jiang)低換熱(re)器的效率。當(dang)T2提(ti)高過大(da)時，電(dian)(dian)熱(re)元(yuan)件(jian)(jian)(jian)(jian)表面的溫(wen)度亦會大(da)大(da)升高，致使一般電(dian)(dian)熱(re)元(yuan)件(jian)(jian)(jian)(jian)無法承(cheng)受，故T2的增加(jia)(jia)(jia)通常受到空(kong)(kong)氣(qi)加(jia)(jia)(jia)熱(re)器中(zhong)電(dian)(dian)熱(re)元(yuan)件(jian)(jian)(jian)(jian)材(cai)料耐(nai)熱(re)性能的限制。