1.增(zeng)大(da)空(kong)氣加(jia)(jia)熱(re)器(qi)的(de)(de)氣體入口流速，能夠(gou)加(jia)(jia)強空(kong)氣電(dian)(dian)加(jia)(jia)熱(re)器(qi)對流換熱(re)，而降低了空(kong)氣加(jia)(jia)熱(re)器(qi)內(nei)電(dian)(dian)熱(re)元(yuan)件表面溫度，不僅有利于延長空(kong)氣加(jia)(jia)熱(re)器(qi)電(dian)(dian)熱(re)元(yuan)件的(de)(de)使(shi)用壽(shou)命(ming)，而且使(shi)得(de)空(kong)氣電(dian)(dian)加(jia)(jia)熱(re)器(qi)散熱(re)損失(shi)減(jian)小，因而空(kong)氣換熱(re)器(qi)的(de)(de)效率(lv)提(ti)高了，但速度如果過大(da)，使(shi)得(de)壓力損失(shi)陡增(zeng)，這(zhe)將不利于加(jia)(jia)熱(re)效率(lv)的(de)(de)提(ti)高。

2.若其它條件(jian)不變(bian)，改(gai)變(bian)表(biao)(biao)面(mian)(mian)負(fu)荷，空氣(qi)(qi)加(jia)熱(re)(re)(re)(re)器(qi)(qi)中(zhong)(zhong)電熱(re)(re)(re)(re)元(yuan)件(jian)的(de)(de)壁溫(wen)將呈直線變(bian)化，如果表(biao)(biao)面(mian)(mian)負(fu)荷增大，電熱(re)(re)(re)(re)元(yuan)件(jian)的(de)(de)壁溫(wen)將增大，這將降低(di)(di)空氣(qi)(qi)加(jia)熱(re)(re)(re)(re)器(qi)(qi)中(zhong)(zhong)電熱(re)(re)(re)(re)元(yuan)件(jian)的(de)(de)使用壽命，但是如果表(biao)(biao)面(mian)(mian)負(fu)荷過(guo)小，壁溫(wen)過(guo)低(di)(di)，空氣(qi)(qi)加(jia)熱(re)(re)(re)(re)器(qi)(qi)換熱(re)(re)(re)(re)器(qi)(qi)的(de)(de)效率又降低(di)(di)了，所以(yi)空氣(qi)(qi)加(jia)熱(re)(re)(re)(re)器(qi)(qi)中(zhong)(zhong)電熱(re)(re)(re)(re)元(yuan)件(jian)的(de)(de)表(biao)(biao)面(mian)(mian)負(fu)荷的(de)(de)選(xuan)擇(ze)比(bi)較(jiao)重要(yao)。

3.空氣(qi)(qi)加(jia)熱(re)(re)器(qi)中空氣(qi)(qi)終溫T2提高時(shi)，由(you)于空氣(qi)(qi)粘性(xing)增加(jia)，氣(qi)(qi)體雷諾(nuo)數減小，使(shi)得對流換(huan)熱(re)(re)強(qiang)度(du)降(jiang)低，空氣(qi)(qi)加(jia)熱(re)(re)器(qi)中電(dian)(dian)(dian)熱(re)(re)元(yuan)(yuan)件(jian)(jian)的(de)表面溫度(du)同時(shi)上升(sheng)，紅外碳硫分析儀(yi)使(shi)得散熱(re)(re)損失增加(jia)，從而降(jiang)低換(huan)熱(re)(re)器(qi)的(de)效率。當T2提高過大(da)時(shi)，電(dian)(dian)(dian)熱(re)(re)元(yuan)(yuan)件(jian)(jian)表面的(de)溫度(du)亦(yi)會大(da)大(da)升(sheng)高，致使(shi)一般電(dian)(dian)(dian)熱(re)(re)元(yuan)(yuan)件(jian)(jian)無法承受，故T2的(de)增加(jia)通常受到空氣(qi)(qi)加(jia)熱(re)(re)器(qi)中電(dian)(dian)(dian)熱(re)(re)元(yuan)(yuan)件(jian)(jian)材料耐熱(re)(re)性(xing)能的(de)限制。