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(di)了(le)空氣(qi)加(jia)熱(re)(re)器內電熱(re)(re)元件表面溫(wen)度，不僅有利(li)于延長空氣(qi)加(jia)熱(re)(re)器電熱(re)(re)元件的(de)使用壽命，而且使得空氣(qi)電加(jia)熱(re)(re)器散熱(re)(re)損失減小，因而空氣(qi)換熱(re)(re)器的(de)效(xiao)率(lv)提(ti)高了(le)，但速度如果過大，使得壓力損失陡(dou)增，這將不利(li)于加(jia)熱(re)(re)效(xiao)率(lv)的(de)提(ti)高。

     2.若其它(ta)條(tiao)件(jian)(jian)(jian)不變(bian)，改變(bian)表面負(fu)(fu)荷，空氣(qi)(qi)加(jia)熱器(qi)中(zhong)(zhong)電(dian)熱元(yuan)件(jian)(jian)(jian)的(de)壁溫(wen)將(jiang)(jiang)呈直線變(bian)化(hua)，如果(guo)表面負(fu)(fu)荷增大，電(dian)熱元(yuan)件(jian)(jian)(jian)的(de)壁溫(wen)將(jiang)(jiang)增大，這將(jiang)(jiang)降(jiang)低(di)(di)空氣(qi)(qi)加(jia)熱器(qi)中(zhong)(zhong)電(dian)熱元(yuan)件(jian)(jian)(jian)的(de)使用壽(shou)命，但是如果(guo)表面負(fu)(fu)荷過(guo)小，壁溫(wen)過(guo)低(di)(di)，空氣(qi)(qi)加(jia)熱器(qi)換熱器(qi)的(de)效率又降(jiang)低(di)(di)了，所以空氣(qi)(qi)加(jia)熱器(qi)中(zhong)(zhong)電(dian)熱元(yuan)件(jian)(jian)(jian)的(de)表面負(fu)(fu)荷的(de)選(xuan)擇比較重要。

     3.空(kong)(kong)氣(qi)(qi)(qi)加(jia)熱(re)(re)(re)器(qi)中(zhong)空(kong)(kong)氣(qi)(qi)(qi)終溫(wen)(wen)T2提高(gao)時(shi)(shi)，由于空(kong)(kong)氣(qi)(qi)(qi)粘性(xing)(xing)增(zeng)加(jia)，氣(qi)(qi)(qi)體雷諾數減小，使得(de)對(dui)流換熱(re)(re)(re)強度(du)降低，空(kong)(kong)氣(qi)(qi)(qi)加(jia)熱(re)(re)(re)器(qi)中(zhong)電(dian)熱(re)(re)(re)元(yuan)(yuan)(yuan)件(jian)(jian)的表(biao)面(mian)溫(wen)(wen)度(du)同時(shi)(shi)上升，紅(hong)外(wai)碳硫分析儀(yi)使得(de)散熱(re)(re)(re)損失(shi)增(zeng)加(jia)，從而降低換熱(re)(re)(re)器(qi)的效率。當(dang)T2提高(gao)過大(da)時(shi)(shi)，電(dian)熱(re)(re)(re)元(yuan)(yuan)(yuan)件(jian)(jian)表(biao)面(mian)的溫(wen)(wen)度(du)亦會大(da)大(da)升高(gao)，致(zhi)使一般電(dian)熱(re)(re)(re)元(yuan)(yuan)(yuan)件(jian)(jian)無法(fa)承受，故T2的增(zeng)加(jia)通常受到空(kong)(kong)氣(qi)(qi)(qi)加(jia)熱(re)(re)(re)器(qi)中(zhong)電(dian)熱(re)(re)(re)元(yuan)(yuan)(yuan)件(jian)(jian)材(cai)料耐(nai)熱(re)(re)(re)性(xing)(xing)能的限制。