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(liu)換熱(re)(re)(re)，而降低了空(kong)(kong)(kong)氣加熱(re)(re)(re)器內電(dian)(dian)熱(re)(re)(re)元件表面溫(wen)度，不僅(jin)有利于延長空(kong)(kong)(kong)氣加熱(re)(re)(re)器電(dian)(dian)熱(re)(re)(re)元件的使(shi)用(yong)壽(shou)命，而且使(shi)得(de)空(kong)(kong)(kong)氣電(dian)(dian)加熱(re)(re)(re)器散熱(re)(re)(re)損(sun)失減小，因而空(kong)(kong)(kong)氣換熱(re)(re)(re)器的效率(lv)提高了，但(dan)速度如果(guo)過大，使(shi)得(de)壓力損(sun)失陡增，這將不利于加熱(re)(re)(re)效率(lv)的提高。

     2.若其它條件(jian)(jian)不變，改變表(biao)面(mian)負(fu)荷(he)(he)，空(kong)(kong)氣(qi)加(jia)熱(re)(re)器中電熱(re)(re)元(yuan)件(jian)(jian)的(de)(de)壁溫(wen)將呈直(zhi)線變化，如果表(biao)面(mian)負(fu)荷(he)(he)增大，電熱(re)(re)元(yuan)件(jian)(jian)的(de)(de)壁溫(wen)將增大，這將降低(di)空(kong)(kong)氣(qi)加(jia)熱(re)(re)器中電熱(re)(re)元(yuan)件(jian)(jian)的(de)(de)使(shi)用壽命，但是(shi)如果表(biao)面(mian)負(fu)荷(he)(he)過小，壁溫(wen)過低(di)，空(kong)(kong)氣(qi)加(jia)熱(re)(re)器換熱(re)(re)器的(de)(de)效率(lv)又降低(di)了，所以空(kong)(kong)氣(qi)加(jia)熱(re)(re)器中電熱(re)(re)元(yuan)件(jian)(jian)的(de)(de)表(biao)面(mian)負(fu)荷(he)(he)的(de)(de)選(xuan)擇(ze)比較(jiao)重要。

     3.空(kong)氣(qi)加熱(re)(re)(re)(re)(re)器(qi)(qi)中空(kong)氣(qi)終溫T2提高(gao)時(shi)(shi)，由于(yu)空(kong)氣(qi)粘性增加，氣(qi)體雷(lei)諾數減小(xiao)，使(shi)得對流換熱(re)(re)(re)(re)(re)強度降低，空(kong)氣(qi)加熱(re)(re)(re)(re)(re)器(qi)(qi)中電(dian)熱(re)(re)(re)(re)(re)元件(jian)的表(biao)(biao)面(mian)溫度同(tong)時(shi)(shi)上升，紅外(wai)碳硫分析儀使(shi)得散熱(re)(re)(re)(re)(re)損失增加，從而降低換熱(re)(re)(re)(re)(re)器(qi)(qi)的效率(lv)。當T2提高(gao)過(guo)大(da)時(shi)(shi)，電(dian)熱(re)(re)(re)(re)(re)元件(jian)表(biao)(biao)面(mian)的溫度亦會(hui)大(da)大(da)升高(gao)，致(zhi)使(shi)一般電(dian)熱(re)(re)(re)(re)(re)元件(jian)無法承受(shou)，故T2的增加通常受(shou)到空(kong)氣(qi)加熱(re)(re)(re)(re)(re)器(qi)(qi)中電(dian)熱(re)(re)(re)(re)(re)元件(jian)材料耐熱(re)(re)(re)(re)(re)性能(neng)的限制。