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)，而(er)(er)降低(di)了空(kong)氣(qi)加(jia)(jia)(jia)熱(re)(re)(re)器(qi)(qi)內電熱(re)(re)(re)元件表(biao)面溫(wen)度(du)(du)，不僅有利(li)于(yu)延長空(kong)氣(qi)加(jia)(jia)(jia)熱(re)(re)(re)器(qi)(qi)電熱(re)(re)(re)元件的(de)使(shi)用壽命，而(er)(er)且使(shi)得(de)空(kong)氣(qi)電加(jia)(jia)(jia)熱(re)(re)(re)器(qi)(qi)散熱(re)(re)(re)損失減小，因(yin)而(er)(er)空(kong)氣(qi)換熱(re)(re)(re)器(qi)(qi)的(de)效率(lv)提高(gao)了，但速度(du)(du)如(ru)果(guo)過大，使(shi)得(de)壓力損失陡(dou)增，這將不利(li)于(yu)加(jia)(jia)(jia)熱(re)(re)(re)效率(lv)的(de)提高(gao)。

     2.若(ruo)其它(ta)條件(jian)(jian)不變(bian)，改變(bian)表面(mian)負荷，空(kong)(kong)氣(qi)(qi)加(jia)(jia)(jia)熱(re)器(qi)(qi)中電(dian)熱(re)元(yuan)(yuan)件(jian)(jian)的(de)(de)(de)壁(bi)溫(wen)(wen)將呈直線(xian)變(bian)化，如果(guo)表面(mian)負荷增大，電(dian)熱(re)元(yuan)(yuan)件(jian)(jian)的(de)(de)(de)壁(bi)溫(wen)(wen)將增大，這(zhe)將降低(di)空(kong)(kong)氣(qi)(qi)加(jia)(jia)(jia)熱(re)器(qi)(qi)中電(dian)熱(re)元(yuan)(yuan)件(jian)(jian)的(de)(de)(de)使用壽命(ming)，但是如果(guo)表面(mian)負荷過小，壁(bi)溫(wen)(wen)過低(di)，空(kong)(kong)氣(qi)(qi)加(jia)(jia)(jia)熱(re)器(qi)(qi)換熱(re)器(qi)(qi)的(de)(de)(de)效(xiao)率又降低(di)了，所(suo)以空(kong)(kong)氣(qi)(qi)加(jia)(jia)(jia)熱(re)器(qi)(qi)中電(dian)熱(re)元(yuan)(yuan)件(jian)(jian)的(de)(de)(de)表面(mian)負荷的(de)(de)(de)選擇比較重(zhong)要。

     3.空(kong)氣(qi)加熱(re)(re)器(qi)中空(kong)氣(qi)終溫(wen)T2提高時(shi)，由(you)于空(kong)氣(qi)粘性(xing)增加，氣(qi)體雷(lei)諾數減小，使得(de)對流換(huan)熱(re)(re)強度(du)降(jiang)低，空(kong)氣(qi)加熱(re)(re)器(qi)中電熱(re)(re)元件的表(biao)面溫(wen)度(du)同時(shi)上(shang)升，紅外碳硫分析儀(yi)使得(de)散熱(re)(re)損失增加，從而(er)降(jiang)低換(huan)熱(re)(re)器(qi)的效率(lv)。當T2提高過大(da)時(shi)，電熱(re)(re)元件表(biao)面的溫(wen)度(du)亦(yi)會大(da)大(da)升高，致使一(yi)般電熱(re)(re)元件無法承受(shou)，故T2的增加通常受(shou)到空(kong)氣(qi)加熱(re)(re)器(qi)中電熱(re)(re)元件材料耐熱(re)(re)性(xing)能的限制。