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)流換熱(re)，而(er)(er)降低了(le)(le)空(kong)(kong)氣加(jia)熱(re)器(qi)內電(dian)(dian)熱(re)元(yuan)件(jian)表面溫度，不(bu)僅有利(li)于延長空(kong)(kong)氣加(jia)熱(re)器(qi)電(dian)(dian)熱(re)元(yuan)件(jian)的(de)使(shi)用壽(shou)命，而(er)(er)且使(shi)得(de)空(kong)(kong)氣電(dian)(dian)加(jia)熱(re)器(qi)散熱(re)損失(shi)減小，因(yin)而(er)(er)空(kong)(kong)氣換熱(re)器(qi)的(de)效(xiao)率提高了(le)(le)，但速度如果過(guo)大，使(shi)得(de)壓力損失(shi)陡增，這將不(bu)利(li)于加(jia)熱(re)效(xiao)率的(de)提高。

     2.若(ruo)其(qi)它條(tiao)件(jian)不變(bian)，改變(bian)表面(mian)(mian)負(fu)荷(he)(he)(he)，空氣加(jia)(jia)熱(re)(re)器(qi)(qi)中電(dian)熱(re)(re)元(yuan)件(jian)的壁(bi)溫將呈直線(xian)變(bian)化，如(ru)果(guo)表面(mian)(mian)負(fu)荷(he)(he)(he)增大(da)，電(dian)熱(re)(re)元(yuan)件(jian)的壁(bi)溫將增大(da)，這將降(jiang)(jiang)低空氣加(jia)(jia)熱(re)(re)器(qi)(qi)中電(dian)熱(re)(re)元(yuan)件(jian)的使用壽(shou)命，但是(shi)如(ru)果(guo)表面(mian)(mian)負(fu)荷(he)(he)(he)過(guo)小，壁(bi)溫過(guo)低，空氣加(jia)(jia)熱(re)(re)器(qi)(qi)換熱(re)(re)器(qi)(qi)的效率(lv)又降(jiang)(jiang)低了，所以空氣加(jia)(jia)熱(re)(re)器(qi)(qi)中電(dian)熱(re)(re)元(yuan)件(jian)的表面(mian)(mian)負(fu)荷(he)(he)(he)的選擇(ze)比(bi)較重(zhong)要。

     3.空(kong)(kong)氣(qi)加(jia)(jia)熱(re)(re)器(qi)中空(kong)(kong)氣(qi)終(zhong)溫(wen)(wen)T2提高時(shi)，由于空(kong)(kong)氣(qi)粘性增(zeng)(zeng)加(jia)(jia)，氣(qi)體(ti)雷諾(nuo)數減小，使(shi)(shi)得對流換(huan)熱(re)(re)強度降低(di)，空(kong)(kong)氣(qi)加(jia)(jia)熱(re)(re)器(qi)中電(dian)熱(re)(re)元(yuan)(yuan)件的(de)表(biao)面(mian)溫(wen)(wen)度同時(shi)上(shang)升，紅(hong)外碳硫分析(xi)儀使(shi)(shi)得散熱(re)(re)損失增(zeng)(zeng)加(jia)(jia)，從而降低(di)換(huan)熱(re)(re)器(qi)的(de)效率(lv)。當T2提高過大(da)(da)時(shi)，電(dian)熱(re)(re)元(yuan)(yuan)件表(biao)面(mian)的(de)溫(wen)(wen)度亦會大(da)(da)大(da)(da)升高，致使(shi)(shi)一般電(dian)熱(re)(re)元(yuan)(yuan)件無法承受，故T2的(de)增(zeng)(zeng)加(jia)(jia)通常受到空(kong)(kong)氣(qi)加(jia)(jia)熱(re)(re)器(qi)中電(dian)熱(re)(re)元(yuan)(yuan)件材料(liao)耐熱(re)(re)性能的(de)限制。