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(huan)熱(re)，而降低了空(kong)氣加(jia)熱(re)器(qi)(qi)(qi)內電熱(re)元件(jian)(jian)表面溫度，不僅有利于延(yan)長空(kong)氣加(jia)熱(re)器(qi)(qi)(qi)電熱(re)元件(jian)(jian)的使(shi)用壽(shou)命，而且(qie)使(shi)得(de)空(kong)氣電加(jia)熱(re)器(qi)(qi)(qi)散(san)熱(re)損(sun)(sun)失減小，因而空(kong)氣換(huan)熱(re)器(qi)(qi)(qi)的效(xiao)率(lv)提(ti)高了，但速度如果過大，使(shi)得(de)壓力損(sun)(sun)失陡(dou)增(zeng)，這將不利于加(jia)熱(re)效(xiao)率(lv)的提(ti)高。

     2.若其它條(tiao)件不變，改(gai)變表(biao)面(mian)負(fu)荷，空(kong)氣(qi)加(jia)熱器(qi)中(zhong)電熱元件的壁溫將呈直線變化，如果(guo)表(biao)面(mian)負(fu)荷增(zeng)大(da)，電熱元件的壁溫將增(zeng)大(da)，這將降低(di)空(kong)氣(qi)加(jia)熱器(qi)中(zhong)電熱元件的使(shi)用壽命，但是如果(guo)表(biao)面(mian)負(fu)荷過(guo)小，壁溫過(guo)低(di)，空(kong)氣(qi)加(jia)熱器(qi)換熱器(qi)的效率(lv)又降低(di)了，所以空(kong)氣(qi)加(jia)熱器(qi)中(zhong)電熱元件的表(biao)面(mian)負(fu)荷的選擇比較重要。

     3.空(kong)(kong)氣(qi)(qi)加(jia)熱(re)(re)(re)器(qi)中(zhong)空(kong)(kong)氣(qi)(qi)終溫T2提(ti)高時(shi)，由于空(kong)(kong)氣(qi)(qi)粘性增加(jia)，氣(qi)(qi)體雷諾(nuo)數(shu)減小，使(shi)得對流換熱(re)(re)(re)強度降低(di)，空(kong)(kong)氣(qi)(qi)加(jia)熱(re)(re)(re)器(qi)中(zhong)電(dian)(dian)熱(re)(re)(re)元(yuan)件(jian)(jian)的表面溫度同時(shi)上(shang)升(sheng)，紅(hong)外(wai)碳硫(liu)分(fen)析儀使(shi)得散熱(re)(re)(re)損(sun)失(shi)增加(jia)，從而(er)降低(di)換熱(re)(re)(re)器(qi)的效率。當T2提(ti)高過大時(shi)，電(dian)(dian)熱(re)(re)(re)元(yuan)件(jian)(jian)表面的溫度亦(yi)會(hui)大大升(sheng)高，致使(shi)一般電(dian)(dian)熱(re)(re)(re)元(yuan)件(jian)(jian)無法承受(shou)，故T2的增加(jia)通常受(shou)到空(kong)(kong)氣(qi)(qi)加(jia)熱(re)(re)(re)器(qi)中(zhong)電(dian)(dian)熱(re)(re)(re)元(yuan)件(jian)(jian)材(cai)料耐熱(re)(re)(re)性能(neng)的限制。