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熱(re)(re)(re)(re)(re)，而(er)降(jiang)低了(le)空氣加熱(re)(re)(re)(re)(re)器(qi)(qi)內電(dian)熱(re)(re)(re)(re)(re)元(yuan)件(jian)表(biao)面溫度，不僅(jin)有利(li)于(yu)延(yan)長空氣加熱(re)(re)(re)(re)(re)器(qi)(qi)電(dian)熱(re)(re)(re)(re)(re)元(yuan)件(jian)的使用(yong)壽(shou)命(ming)，而(er)且使得空氣電(dian)加熱(re)(re)(re)(re)(re)器(qi)(qi)散熱(re)(re)(re)(re)(re)損(sun)失(shi)減小，因而(er)空氣換熱(re)(re)(re)(re)(re)器(qi)(qi)的效率提高(gao)了(le)，但速度如果過大，使得壓力損(sun)失(shi)陡增(zeng)，這將不利(li)于(yu)加熱(re)(re)(re)(re)(re)效率的提高(gao)。

     2.若其它條件不變(bian)，改變(bian)表(biao)面(mian)(mian)負荷，空(kong)氣(qi)加熱(re)器中(zhong)電(dian)(dian)熱(re)元(yuan)件的(de)壁(bi)溫將呈(cheng)直線變(bian)化，如(ru)果表(biao)面(mian)(mian)負荷增大，電(dian)(dian)熱(re)元(yuan)件的(de)壁(bi)溫將增大，這將降低空(kong)氣(qi)加熱(re)器中(zhong)電(dian)(dian)熱(re)元(yuan)件的(de)使用(yong)壽命(ming)，但是如(ru)果表(biao)面(mian)(mian)負荷過小，壁(bi)溫過低，空(kong)氣(qi)加熱(re)器換熱(re)器的(de)效(xiao)率又(you)降低了，所以(yi)空(kong)氣(qi)加熱(re)器中(zhong)電(dian)(dian)熱(re)元(yuan)件的(de)表(biao)面(mian)(mian)負荷的(de)選(xuan)擇(ze)比(bi)較重要。

     3.空氣(qi)(qi)加(jia)(jia)熱(re)器(qi)中空氣(qi)(qi)終溫T2提高(gao)(gao)時，由于空氣(qi)(qi)粘(zhan)性(xing)增(zeng)(zeng)加(jia)(jia)，氣(qi)(qi)體雷諾數(shu)減小，使(shi)(shi)得對流(liu)換熱(re)強度降(jiang)低，空氣(qi)(qi)加(jia)(jia)熱(re)器(qi)中電(dian)熱(re)元(yuan)(yuan)件(jian)的(de)表面(mian)(mian)溫度同(tong)時上升(sheng)，紅外碳(tan)硫分(fen)析(xi)儀使(shi)(shi)得散熱(re)損失(shi)增(zeng)(zeng)加(jia)(jia)，從而降(jiang)低換熱(re)器(qi)的(de)效(xiao)率。當T2提高(gao)(gao)過大時，電(dian)熱(re)元(yuan)(yuan)件(jian)表面(mian)(mian)的(de)溫度亦會大大升(sheng)高(gao)(gao)，致使(shi)(shi)一般電(dian)熱(re)元(yuan)(yuan)件(jian)無法承受，故T2的(de)增(zeng)(zeng)加(jia)(jia)通常受到(dao)空氣(qi)(qi)加(jia)(jia)熱(re)器(qi)中電(dian)熱(re)元(yuan)(yuan)件(jian)材(cai)料耐熱(re)性(xing)能的(de)限制。