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)，而(er)降低了空(kong)(kong)(kong)氣(qi)加熱(re)器(qi)內電(dian)(dian)熱(re)元件表面溫度，不僅(jin)有利(li)于延(yan)長空(kong)(kong)(kong)氣(qi)加熱(re)器(qi)電(dian)(dian)熱(re)元件的使(shi)(shi)用壽命，而(er)且使(shi)(shi)得空(kong)(kong)(kong)氣(qi)電(dian)(dian)加熱(re)器(qi)散熱(re)損(sun)失減小，因而(er)空(kong)(kong)(kong)氣(qi)換(huan)熱(re)器(qi)的效率提高(gao)了，但(dan)速度如果過大，使(shi)(shi)得壓力(li)損(sun)失陡增，這將不利(li)于加熱(re)效率的提高(gao)。

     2.若其(qi)它條件(jian)(jian)不變，改變表(biao)面(mian)負荷(he)，空(kong)(kong)氣加(jia)熱(re)(re)(re)器中電(dian)(dian)熱(re)(re)(re)元(yuan)件(jian)(jian)的(de)(de)(de)壁(bi)溫(wen)將呈直(zhi)線變化，如(ru)果表(biao)面(mian)負荷(he)增大，電(dian)(dian)熱(re)(re)(re)元(yuan)件(jian)(jian)的(de)(de)(de)壁(bi)溫(wen)將增大，這(zhe)將降(jiang)低空(kong)(kong)氣加(jia)熱(re)(re)(re)器中電(dian)(dian)熱(re)(re)(re)元(yuan)件(jian)(jian)的(de)(de)(de)使(shi)用壽(shou)命，但是如(ru)果表(biao)面(mian)負荷(he)過(guo)小(xiao)，壁(bi)溫(wen)過(guo)低，空(kong)(kong)氣加(jia)熱(re)(re)(re)器換熱(re)(re)(re)器的(de)(de)(de)效率又降(jiang)低了，所以空(kong)(kong)氣加(jia)熱(re)(re)(re)器中電(dian)(dian)熱(re)(re)(re)元(yuan)件(jian)(jian)的(de)(de)(de)表(biao)面(mian)負荷(he)的(de)(de)(de)選(xuan)擇比較(jiao)重要。

     3.空(kong)(kong)氣加(jia)熱(re)(re)器中(zhong)空(kong)(kong)氣終溫(wen)T2提高(gao)(gao)時，由于(yu)空(kong)(kong)氣粘性增加(jia)，氣體雷諾數減小(xiao)，使得(de)對流(liu)換熱(re)(re)強度(du)降低(di)，空(kong)(kong)氣加(jia)熱(re)(re)器中(zhong)電(dian)熱(re)(re)元件(jian)的(de)(de)(de)表(biao)面(mian)溫(wen)度(du)同(tong)時上升，紅外碳硫分析儀使得(de)散熱(re)(re)損失增加(jia)，從(cong)而降低(di)換熱(re)(re)器的(de)(de)(de)效率。當T2提高(gao)(gao)過大(da)時，電(dian)熱(re)(re)元件(jian)表(biao)面(mian)的(de)(de)(de)溫(wen)度(du)亦會大(da)大(da)升高(gao)(gao)，致使一般電(dian)熱(re)(re)元件(jian)無法承(cheng)受(shou)，故T2的(de)(de)(de)增加(jia)通常受(shou)到(dao)空(kong)(kong)氣加(jia)熱(re)(re)器中(zhong)電(dian)熱(re)(re)元件(jian)材料耐熱(re)(re)性能的(de)(de)(de)限制。