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)，而降低了空(kong)氣加熱(re)(re)器(qi)內(nei)電熱(re)(re)元件表面溫度，不僅有利(li)于延長空(kong)氣加熱(re)(re)器(qi)電熱(re)(re)元件的(de)使用壽命(ming)，而且使得(de)空(kong)氣電加熱(re)(re)器(qi)散熱(re)(re)損(sun)(sun)失減小(xiao)，因而空(kong)氣換熱(re)(re)器(qi)的(de)效(xiao)(xiao)率(lv)提(ti)高了，但速度如果(guo)過大，使得(de)壓(ya)力(li)損(sun)(sun)失陡(dou)增，這(zhe)將(jiang)不利(li)于加熱(re)(re)效(xiao)(xiao)率(lv)的(de)提(ti)高。

     2.若(ruo)其它(ta)條件(jian)(jian)不變，改(gai)變表面負(fu)(fu)荷，空(kong)(kong)(kong)氣加(jia)(jia)熱(re)器(qi)(qi)(qi)中(zhong)(zhong)電(dian)(dian)熱(re)元(yuan)件(jian)(jian)的(de)壁溫將(jiang)呈直線變化，如果(guo)表面負(fu)(fu)荷增(zeng)大(da)，電(dian)(dian)熱(re)元(yuan)件(jian)(jian)的(de)壁溫將(jiang)增(zeng)大(da)，這將(jiang)降低空(kong)(kong)(kong)氣加(jia)(jia)熱(re)器(qi)(qi)(qi)中(zhong)(zhong)電(dian)(dian)熱(re)元(yuan)件(jian)(jian)的(de)使用(yong)壽命，但是如果(guo)表面負(fu)(fu)荷過小，壁溫過低，空(kong)(kong)(kong)氣加(jia)(jia)熱(re)器(qi)(qi)(qi)換熱(re)器(qi)(qi)(qi)的(de)效(xiao)率又(you)降低了(le)，所以空(kong)(kong)(kong)氣加(jia)(jia)熱(re)器(qi)(qi)(qi)中(zhong)(zhong)電(dian)(dian)熱(re)元(yuan)件(jian)(jian)的(de)表面負(fu)(fu)荷的(de)選擇比較(jiao)重(zhong)要。

     3.空(kong)氣(qi)加(jia)熱(re)器中(zhong)空(kong)氣(qi)終(zhong)溫(wen)(wen)T2提高(gao)時(shi)，由(you)于空(kong)氣(qi)粘性(xing)增(zeng)(zeng)(zeng)加(jia)，氣(qi)體雷諾數減小，使得對流換熱(re)強度(du)降低，空(kong)氣(qi)加(jia)熱(re)器中(zhong)電熱(re)元(yuan)件(jian)的表面(mian)溫(wen)(wen)度(du)同時(shi)上升(sheng)，紅(hong)外碳(tan)硫分析儀使得散熱(re)損(sun)失增(zeng)(zeng)(zeng)加(jia)，從而降低換熱(re)器的效率。當(dang)T2提高(gao)過(guo)大(da)時(shi)，電熱(re)元(yuan)件(jian)表面(mian)的溫(wen)(wen)度(du)亦會大(da)大(da)升(sheng)高(gao)，致使一般電熱(re)元(yuan)件(jian)無法承(cheng)受，故T2的增(zeng)(zeng)(zeng)加(jia)通常受到空(kong)氣(qi)加(jia)熱(re)器中(zhong)電熱(re)元(yuan)件(jian)材料耐熱(re)性(xing)能的限制(zhi)。