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(dui)流(liu)換熱(re)(re)(re)，而(er)降低(di)了空氣(qi)加(jia)熱(re)(re)(re)器(qi)內(nei)電(dian)(dian)熱(re)(re)(re)元(yuan)(yuan)件(jian)表面(mian)溫度，不(bu)僅(jin)有(you)利于(yu)延長空氣(qi)加(jia)熱(re)(re)(re)器(qi)電(dian)(dian)熱(re)(re)(re)元(yuan)(yuan)件(jian)的(de)使用壽命，而(er)且使得(de)空氣(qi)電(dian)(dian)加(jia)熱(re)(re)(re)器(qi)散熱(re)(re)(re)損(sun)失(shi)減小，因而(er)空氣(qi)換熱(re)(re)(re)器(qi)的(de)效(xiao)率提高了，但速度如(ru)果過大，使得(de)壓力損(sun)失(shi)陡增(zeng)，這將不(bu)利于(yu)加(jia)熱(re)(re)(re)效(xiao)率的(de)提高。

     2.若(ruo)其(qi)它條(tiao)件(jian)(jian)(jian)不變，改變表面負荷(he)，空氣(qi)加熱(re)(re)器(qi)(qi)中(zhong)電(dian)熱(re)(re)元(yuan)件(jian)(jian)(jian)的(de)壁溫將呈直線變化(hua)，如果表面負荷(he)增(zeng)大，電(dian)熱(re)(re)元(yuan)件(jian)(jian)(jian)的(de)壁溫將增(zeng)大，這將降(jiang)低空氣(qi)加熱(re)(re)器(qi)(qi)中(zhong)電(dian)熱(re)(re)元(yuan)件(jian)(jian)(jian)的(de)使(shi)用壽命，但是如果表面負荷(he)過(guo)小(xiao)，壁溫過(guo)低，空氣(qi)加熱(re)(re)器(qi)(qi)換熱(re)(re)器(qi)(qi)的(de)效率又(you)降(jiang)低了，所以(yi)空氣(qi)加熱(re)(re)器(qi)(qi)中(zhong)電(dian)熱(re)(re)元(yuan)件(jian)(jian)(jian)的(de)表面負荷(he)的(de)選擇(ze)比較重要。

     3.空(kong)(kong)(kong)氣(qi)加(jia)(jia)熱(re)(re)(re)器(qi)(qi)(qi)中空(kong)(kong)(kong)氣(qi)終溫T2提高(gao)時，由于空(kong)(kong)(kong)氣(qi)粘性增(zeng)加(jia)(jia)，氣(qi)體雷諾數減小，使(shi)得(de)對流換(huan)熱(re)(re)(re)強度(du)降低(di)，空(kong)(kong)(kong)氣(qi)加(jia)(jia)熱(re)(re)(re)器(qi)(qi)(qi)中電(dian)熱(re)(re)(re)元件的(de)表(biao)面(mian)(mian)溫度(du)同時上(shang)升，紅外碳硫(liu)分析儀使(shi)得(de)散熱(re)(re)(re)損失增(zeng)加(jia)(jia)，從而降低(di)換(huan)熱(re)(re)(re)器(qi)(qi)(qi)的(de)效率。當T2提高(gao)過大(da)時，電(dian)熱(re)(re)(re)元件表(biao)面(mian)(mian)的(de)溫度(du)亦會大(da)大(da)升高(gao)，致(zhi)使(shi)一般(ban)電(dian)熱(re)(re)(re)元件無法(fa)承(cheng)受，故(gu)T2的(de)增(zeng)加(jia)(jia)通常受到空(kong)(kong)(kong)氣(qi)加(jia)(jia)熱(re)(re)(re)器(qi)(qi)(qi)中電(dian)熱(re)(re)(re)元件材料耐熱(re)(re)(re)性能的(de)限制(zhi)。