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(huan)熱(re)(re)(re)，而(er)降低(di)了空(kong)(kong)(kong)氣(qi)加熱(re)(re)(re)器內電(dian)熱(re)(re)(re)元(yuan)件表面溫度，不(bu)(bu)僅有利于延長(chang)空(kong)(kong)(kong)氣(qi)加熱(re)(re)(re)器電(dian)熱(re)(re)(re)元(yuan)件的(de)使用(yong)壽命，而(er)且使得空(kong)(kong)(kong)氣(qi)電(dian)加熱(re)(re)(re)器散熱(re)(re)(re)損失(shi)減小(xiao)，因而(er)空(kong)(kong)(kong)氣(qi)換(huan)熱(re)(re)(re)器的(de)效率提高了，但速度如果過大，使得壓力損失(shi)陡增，這將不(bu)(bu)利于加熱(re)(re)(re)效率的(de)提高。

     2.若其它(ta)條件(jian)(jian)不變，改變表面(mian)(mian)負(fu)荷，空氣(qi)加熱(re)器(qi)(qi)中電(dian)(dian)(dian)熱(re)元件(jian)(jian)的(de)(de)壁溫(wen)(wen)(wen)將(jiang)(jiang)呈(cheng)直線(xian)變化，如果(guo)表面(mian)(mian)負(fu)荷增大(da)，電(dian)(dian)(dian)熱(re)元件(jian)(jian)的(de)(de)壁溫(wen)(wen)(wen)將(jiang)(jiang)增大(da)，這將(jiang)(jiang)降低空氣(qi)加熱(re)器(qi)(qi)中電(dian)(dian)(dian)熱(re)元件(jian)(jian)的(de)(de)使用壽命，但是如果(guo)表面(mian)(mian)負(fu)荷過(guo)小，壁溫(wen)(wen)(wen)過(guo)低，空氣(qi)加熱(re)器(qi)(qi)換熱(re)器(qi)(qi)的(de)(de)效(xiao)率又降低了(le)，所以(yi)空氣(qi)加熱(re)器(qi)(qi)中電(dian)(dian)(dian)熱(re)元件(jian)(jian)的(de)(de)表面(mian)(mian)負(fu)荷的(de)(de)選擇比(bi)較(jiao)重要(yao)。

     3.空氣(qi)(qi)(qi)加(jia)熱(re)(re)器(qi)中(zhong)空氣(qi)(qi)(qi)終(zhong)溫(wen)(wen)(wen)T2提(ti)高時，由于(yu)空氣(qi)(qi)(qi)粘性增加(jia)，氣(qi)(qi)(qi)體雷諾數減小(xiao)，使(shi)(shi)得(de)對(dui)流換熱(re)(re)強度(du)降低(di)，空氣(qi)(qi)(qi)加(jia)熱(re)(re)器(qi)中(zhong)電熱(re)(re)元(yuan)件(jian)(jian)的表(biao)面溫(wen)(wen)(wen)度(du)同時上升，紅外碳硫分析儀使(shi)(shi)得(de)散熱(re)(re)損失增加(jia)，從(cong)而降低(di)換熱(re)(re)器(qi)的效率。當T2提(ti)高過大(da)時，電熱(re)(re)元(yuan)件(jian)(jian)表(biao)面的溫(wen)(wen)(wen)度(du)亦會大(da)大(da)升高，致使(shi)(shi)一(yi)般電熱(re)(re)元(yuan)件(jian)(jian)無法承受(shou)，故(gu)T2的增加(jia)通常受(shou)到空氣(qi)(qi)(qi)加(jia)熱(re)(re)器(qi)中(zhong)電熱(re)(re)元(yuan)件(jian)(jian)材料耐(nai)熱(re)(re)性能的限制(zhi)。