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)(re),而降低了(le)空氣(qi)加熱(re)(re)(re)器(qi)內(nei)電熱(re)(re)(re)元件(jian)表面溫(wen)度,不僅有利(li)于(yu)延長(chang)空氣(qi)加熱(re)(re)(re)器(qi)電熱(re)(re)(re)元件(jian)的(de)使用壽命(ming),而且使得空氣(qi)電加熱(re)(re)(re)器(qi)散熱(re)(re)(re)損失(shi)減小,因(yin)而空氣(qi)換熱(re)(re)(re)器(qi)的(de)效(xiao)率(lv)提高了(le),但速度如果過大(da),使得壓力損失(shi)陡增,這將不利(li)于(yu)加熱(re)(re)(re)效(xiao)率(lv)的(de)提高。
2.若其它條件(jian)(jian)不變,改變表(biao)面(mian)(mian)負(fu)荷(he),空(kong)氣(qi)加(jia)(jia)熱器(qi)中電(dian)熱元(yuan)(yuan)件(jian)(jian)的(de)(de)壁溫(wen)將(jiang)呈直線變化,如果表(biao)面(mian)(mian)負(fu)荷(he)增大(da),電(dian)熱元(yuan)(yuan)件(jian)(jian)的(de)(de)壁溫(wen)將(jiang)增大(da),這將(jiang)降低(di)(di)空(kong)氣(qi)加(jia)(jia)熱器(qi)中電(dian)熱元(yuan)(yuan)件(jian)(jian)的(de)(de)使用(yong)壽命,但(dan)是如果表(biao)面(mian)(mian)負(fu)荷(he)過(guo)小(xiao),壁溫(wen)過(guo)低(di)(di),空(kong)氣(qi)加(jia)(jia)熱器(qi)換熱器(qi)的(de)(de)效率(lv)又降低(di)(di)了,所以(yi)空(kong)氣(qi)加(jia)(jia)熱器(qi)中電(dian)熱元(yuan)(yuan)件(jian)(jian)的(de)(de)表(biao)面(mian)(mian)負(fu)荷(he)的(de)(de)選擇比(bi)較重(zhong)要(yao)。
3.空氣(qi)(qi)(qi)加(jia)熱(re)器(qi)(qi)中空氣(qi)(qi)(qi)終溫T2提高時(shi),由于空氣(qi)(qi)(qi)粘性增加(jia),氣(qi)(qi)(qi)體雷(lei)諾數減(jian)小,使(shi)得(de)對(dui)流(liu)換熱(re)強度(du)(du)降低(di),空氣(qi)(qi)(qi)加(jia)熱(re)器(qi)(qi)中電(dian)熱(re)元(yuan)(yuan)件的(de)(de)表(biao)面(mian)溫度(du)(du)同時(shi)上升,紅外碳硫分析儀使(shi)得(de)散熱(re)損(sun)失(shi)增加(jia),從而降低(di)換熱(re)器(qi)(qi)的(de)(de)效率。當T2提高過大(da)時(shi),電(dian)熱(re)元(yuan)(yuan)件表(biao)面(mian)的(de)(de)溫度(du)(du)亦會大(da)大(da)升高,致使(shi)一般(ban)電(dian)熱(re)元(yuan)(yuan)件無法承(cheng)受,故T2的(de)(de)增加(jia)通常受到(dao)空氣(qi)(qi)(qi)加(jia)熱(re)器(qi)(qi)中電(dian)熱(re)元(yuan)(yuan)件材料耐熱(re)性能(neng)的(de)(de)限制(zhi)。