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),而(er)(er)降低了(le)空(kong)氣加熱(re)(re)器(qi)內電熱(re)(re)元(yuan)件表面溫度(du),不(bu)僅有(you)利于延(yan)長空(kong)氣加熱(re)(re)器(qi)電熱(re)(re)元(yuan)件的使用(yong)壽命(ming),而(er)(er)且使得空(kong)氣電加熱(re)(re)器(qi)散熱(re)(re)損(sun)(sun)失(shi)減小(xiao),因而(er)(er)空(kong)氣換熱(re)(re)器(qi)的效(xiao)率提(ti)高了(le),但速度(du)如果(guo)過(guo)大,使得壓力(li)損(sun)(sun)失(shi)陡增(zeng),這(zhe)將(jiang)不(bu)利于加熱(re)(re)效(xiao)率的提(ti)高。
2.若其它(ta)條件(jian)不變,改變表(biao)面(mian)(mian)負(fu)荷(he)(he),空(kong)氣(qi)(qi)加(jia)熱器(qi)(qi)(qi)中電熱元(yuan)件(jian)的(de)壁(bi)溫將呈直線變化,如果(guo)表(biao)面(mian)(mian)負(fu)荷(he)(he)增大,電熱元(yuan)件(jian)的(de)壁(bi)溫將增大,這(zhe)將降低空(kong)氣(qi)(qi)加(jia)熱器(qi)(qi)(qi)中電熱元(yuan)件(jian)的(de)使用壽命(ming),但是(shi)如果(guo)表(biao)面(mian)(mian)負(fu)荷(he)(he)過小,壁(bi)溫過低,空(kong)氣(qi)(qi)加(jia)熱器(qi)(qi)(qi)換熱器(qi)(qi)(qi)的(de)效率又降低了,所(suo)以空(kong)氣(qi)(qi)加(jia)熱器(qi)(qi)(qi)中電熱元(yuan)件(jian)的(de)表(biao)面(mian)(mian)負(fu)荷(he)(he)的(de)選擇(ze)比較重要。
3.空氣(qi)加熱(re)(re)(re)器(qi)中(zhong)空氣(qi)終(zhong)溫T2提(ti)高時(shi)(shi)(shi),由于空氣(qi)粘性(xing)增加,氣(qi)體雷諾數減小,使得對流換熱(re)(re)(re)強(qiang)度降(jiang)(jiang)低,空氣(qi)加熱(re)(re)(re)器(qi)中(zhong)電熱(re)(re)(re)元(yuan)件(jian)(jian)的表面(mian)溫度同(tong)時(shi)(shi)(shi)上升(sheng),紅外碳硫分(fen)析儀使得散熱(re)(re)(re)損失增加,從(cong)而降(jiang)(jiang)低換熱(re)(re)(re)器(qi)的效率(lv)。當T2提(ti)高過(guo)大時(shi)(shi)(shi),電熱(re)(re)(re)元(yuan)件(jian)(jian)表面(mian)的溫度亦會大大升(sheng)高,致(zhi)使一般電熱(re)(re)(re)元(yuan)件(jian)(jian)無法(fa)承受(shou),故T2的增加通常受(shou)到空氣(qi)加熱(re)(re)(re)器(qi)中(zhong)電熱(re)(re)(re)元(yuan)件(jian)(jian)材料(liao)耐熱(re)(re)(re)性(xing)能(neng)的限制。