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,而降低了空氣加(jia)(jia)熱器(qi)內電熱元(yuan)件表面溫(wen)度,不(bu)僅(jin)有利(li)于(yu)延長空氣加(jia)(jia)熱器(qi)電熱元(yuan)件的使(shi)用壽命(ming),而且使(shi)得空氣電加(jia)(jia)熱器(qi)散熱損(sun)失減小,因而空氣換熱器(qi)的效(xiao)率提(ti)高了,但速(su)度如果(guo)過大,使(shi)得壓力損(sun)失陡增,這將不(bu)利(li)于(yu)加(jia)(jia)熱效(xiao)率的提(ti)高。
2.若其它條(tiao)件不變(bian),改變(bian)表(biao)面(mian)負(fu)荷,空(kong)(kong)氣加(jia)熱(re)(re)(re)(re)器中(zhong)電熱(re)(re)(re)(re)元(yuan)(yuan)件的(de)(de)壁(bi)溫將(jiang)呈直線(xian)變(bian)化(hua),如果(guo)表(biao)面(mian)負(fu)荷增(zeng)大(da),電熱(re)(re)(re)(re)元(yuan)(yuan)件的(de)(de)壁(bi)溫將(jiang)增(zeng)大(da),這將(jiang)降低空(kong)(kong)氣加(jia)熱(re)(re)(re)(re)器中(zhong)電熱(re)(re)(re)(re)元(yuan)(yuan)件的(de)(de)使用壽命,但是如果(guo)表(biao)面(mian)負(fu)荷過(guo)小,壁(bi)溫過(guo)低,空(kong)(kong)氣加(jia)熱(re)(re)(re)(re)器換(huan)熱(re)(re)(re)(re)器的(de)(de)效率又降低了,所以(yi)空(kong)(kong)氣加(jia)熱(re)(re)(re)(re)器中(zhong)電熱(re)(re)(re)(re)元(yuan)(yuan)件的(de)(de)表(biao)面(mian)負(fu)荷的(de)(de)選擇比較重要。
3.空(kong)氣(qi)(qi)加(jia)熱(re)器(qi)中空(kong)氣(qi)(qi)終溫(wen)T2提高時(shi),由于(yu)空(kong)氣(qi)(qi)粘性(xing)增(zeng)加(jia),氣(qi)(qi)體雷(lei)諾(nuo)數(shu)減(jian)小,使(shi)(shi)得(de)對流(liu)換熱(re)強度(du)(du)降低,空(kong)氣(qi)(qi)加(jia)熱(re)器(qi)中電(dian)(dian)熱(re)元件(jian)的(de)(de)表(biao)面溫(wen)度(du)(du)同(tong)時(shi)上升,紅外碳硫分析儀使(shi)(shi)得(de)散熱(re)損(sun)失增(zeng)加(jia),從而降低換熱(re)器(qi)的(de)(de)效率。當T2提高過大時(shi),電(dian)(dian)熱(re)元件(jian)表(biao)面的(de)(de)溫(wen)度(du)(du)亦會大大升高,致(zhi)使(shi)(shi)一般電(dian)(dian)熱(re)元件(jian)無法承受,故T2的(de)(de)增(zeng)加(jia)通常受到空(kong)氣(qi)(qi)加(jia)熱(re)器(qi)中電(dian)(dian)熱(re)元件(jian)材(cai)料耐(nai)熱(re)性(xing)能的(de)(de)限(xian)制。