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)，而(er)(er)降低了空(kong)(kong)(kong)氣(qi)加熱(re)(re)器(qi)內(nei)電熱(re)(re)元件表面溫度，不僅有利于延(yan)長(chang)空(kong)(kong)(kong)氣(qi)加熱(re)(re)器(qi)電熱(re)(re)元件的使(shi)用(yong)壽命(ming)，而(er)(er)且(qie)使(shi)得空(kong)(kong)(kong)氣(qi)電加熱(re)(re)器(qi)散熱(re)(re)損失減(jian)小(xiao)，因而(er)(er)空(kong)(kong)(kong)氣(qi)換熱(re)(re)器(qi)的效(xiao)率提(ti)高了，但速(su)度如果過大，使(shi)得壓力(li)損失陡(dou)增(zeng)，這將不利于加熱(re)(re)效(xiao)率的提(ti)高。

     2.若其它條(tiao)件(jian)不變，改變表(biao)面(mian)(mian)負荷，空氣加(jia)熱(re)(re)器(qi)(qi)中電(dian)(dian)(dian)熱(re)(re)元件(jian)的(de)壁(bi)溫(wen)(wen)(wen)將呈(cheng)直線變化，如(ru)(ru)果表(biao)面(mian)(mian)負荷增(zeng)大，電(dian)(dian)(dian)熱(re)(re)元件(jian)的(de)壁(bi)溫(wen)(wen)(wen)將增(zeng)大，這將降低空氣加(jia)熱(re)(re)器(qi)(qi)中電(dian)(dian)(dian)熱(re)(re)元件(jian)的(de)使(shi)用壽命，但是如(ru)(ru)果表(biao)面(mian)(mian)負荷過小，壁(bi)溫(wen)(wen)(wen)過低，空氣加(jia)熱(re)(re)器(qi)(qi)換熱(re)(re)器(qi)(qi)的(de)效率又降低了，所以空氣加(jia)熱(re)(re)器(qi)(qi)中電(dian)(dian)(dian)熱(re)(re)元件(jian)的(de)表(biao)面(mian)(mian)負荷的(de)選擇比較重要。

     3.空氣加(jia)熱(re)(re)(re)器(qi)中(zhong)空氣終溫(wen)T2提(ti)高(gao)時(shi)，由于空氣粘性增加(jia)，氣體(ti)雷諾數減(jian)小，使(shi)得對(dui)流換熱(re)(re)(re)強度(du)降(jiang)低(di)，空氣加(jia)熱(re)(re)(re)器(qi)中(zhong)電(dian)(dian)熱(re)(re)(re)元件(jian)(jian)的表(biao)面溫(wen)度(du)同時(shi)上升(sheng)，紅(hong)外碳硫分析儀使(shi)得散熱(re)(re)(re)損失增加(jia)，從而降(jiang)低(di)換熱(re)(re)(re)器(qi)的效率(lv)。當(dang)T2提(ti)高(gao)過大時(shi)，電(dian)(dian)熱(re)(re)(re)元件(jian)(jian)表(biao)面的溫(wen)度(du)亦會大大升(sheng)高(gao)，致使(shi)一般電(dian)(dian)熱(re)(re)(re)元件(jian)(jian)無法承受，故T2的增加(jia)通(tong)常(chang)受到空氣加(jia)熱(re)(re)(re)器(qi)中(zhong)電(dian)(dian)熱(re)(re)(re)元件(jian)(jian)材料耐(nai)熱(re)(re)(re)性能的限(xian)制(zhi)。