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(liu)換(huan)熱(re)(re)(re)(re)(re)，而降(jiang)低了(le)空(kong)氣(qi)加(jia)熱(re)(re)(re)(re)(re)器(qi)(qi)內電(dian)熱(re)(re)(re)(re)(re)元件(jian)表面溫度，不僅有利于延長空(kong)氣(qi)加(jia)熱(re)(re)(re)(re)(re)器(qi)(qi)電(dian)熱(re)(re)(re)(re)(re)元件(jian)的使(shi)用壽命(ming)，而且(qie)使(shi)得空(kong)氣(qi)電(dian)加(jia)熱(re)(re)(re)(re)(re)器(qi)(qi)散熱(re)(re)(re)(re)(re)損(sun)(sun)失(shi)減小，因而空(kong)氣(qi)換(huan)熱(re)(re)(re)(re)(re)器(qi)(qi)的效率提高(gao)(gao)了(le)，但速度如(ru)果過大，使(shi)得壓力損(sun)(sun)失(shi)陡增，這將不利于加(jia)熱(re)(re)(re)(re)(re)效率的提高(gao)(gao)。

     2.若其它條件(jian)不變，改(gai)變表面負荷(he)(he)(he)，空氣加熱(re)(re)器中(zhong)電熱(re)(re)元(yuan)件(jian)的(de)壁溫將呈直(zhi)線變化，如果(guo)(guo)表面負荷(he)(he)(he)增大，電熱(re)(re)元(yuan)件(jian)的(de)壁溫將增大，這將降低(di)(di)空氣加熱(re)(re)器中(zhong)電熱(re)(re)元(yuan)件(jian)的(de)使用(yong)壽命，但是如果(guo)(guo)表面負荷(he)(he)(he)過小，壁溫過低(di)(di)，空氣加熱(re)(re)器換(huan)熱(re)(re)器的(de)效率又(you)降低(di)(di)了，所(suo)以空氣加熱(re)(re)器中(zhong)電熱(re)(re)元(yuan)件(jian)的(de)表面負荷(he)(he)(he)的(de)選擇比較重要。

     3.空(kong)(kong)(kong)(kong)氣加(jia)熱(re)(re)器(qi)中空(kong)(kong)(kong)(kong)氣終溫(wen)T2提高時(shi)(shi)，由(you)于空(kong)(kong)(kong)(kong)氣粘(zhan)性增(zeng)加(jia)，氣體雷(lei)諾數減小，使(shi)得對流換熱(re)(re)強度降低，空(kong)(kong)(kong)(kong)氣加(jia)熱(re)(re)器(qi)中電(dian)熱(re)(re)元(yuan)件(jian)的表(biao)(biao)面溫(wen)度同(tong)時(shi)(shi)上升(sheng)(sheng)，紅外碳硫(liu)分析儀使(shi)得散熱(re)(re)損失增(zeng)加(jia)，從而(er)降低換熱(re)(re)器(qi)的效率(lv)。當T2提高過大(da)時(shi)(shi)，電(dian)熱(re)(re)元(yuan)件(jian)表(biao)(biao)面的溫(wen)度亦會大(da)大(da)升(sheng)(sheng)高，致使(shi)一般(ban)電(dian)熱(re)(re)元(yuan)件(jian)無法承受，故T2的增(zeng)加(jia)通常受到(dao)空(kong)(kong)(kong)(kong)氣加(jia)熱(re)(re)器(qi)中電(dian)熱(re)(re)元(yuan)件(jian)材料耐熱(re)(re)性能的限制。