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(dui)流換(huan)熱(re),而降低(di)了空(kong)(kong)氣(qi)加(jia)熱(re)器(qi)內電熱(re)元件表面溫(wen)度,不(bu)僅有利(li)于(yu)延長空(kong)(kong)氣(qi)加(jia)熱(re)器(qi)電熱(re)元件的(de)(de)使(shi)用(yong)壽命(ming),而且使(shi)得空(kong)(kong)氣(qi)電加(jia)熱(re)器(qi)散熱(re)損(sun)失減小,因(yin)而空(kong)(kong)氣(qi)換(huan)熱(re)器(qi)的(de)(de)效率提(ti)高了,但速度如(ru)果(guo)過(guo)大,使(shi)得壓(ya)力損(sun)失陡增,這(zhe)將(jiang)不(bu)利(li)于(yu)加(jia)熱(re)效率的(de)(de)提(ti)高。
2.若(ruo)其它條(tiao)件不變(bian)(bian),改(gai)變(bian)(bian)表(biao)面(mian)負荷,空氣(qi)加(jia)(jia)(jia)熱(re)器(qi)中電(dian)熱(re)元(yuan)件的(de)(de)(de)壁溫將(jiang)呈直線變(bian)(bian)化,如(ru)果(guo)表(biao)面(mian)負荷增(zeng)大,電(dian)熱(re)元(yuan)件的(de)(de)(de)壁溫將(jiang)增(zeng)大,這(zhe)將(jiang)降低空氣(qi)加(jia)(jia)(jia)熱(re)器(qi)中電(dian)熱(re)元(yuan)件的(de)(de)(de)使用壽(shou)命,但是如(ru)果(guo)表(biao)面(mian)負荷過(guo)小,壁溫過(guo)低,空氣(qi)加(jia)(jia)(jia)熱(re)器(qi)換熱(re)器(qi)的(de)(de)(de)效率又降低了,所以空氣(qi)加(jia)(jia)(jia)熱(re)器(qi)中電(dian)熱(re)元(yuan)件的(de)(de)(de)表(biao)面(mian)負荷的(de)(de)(de)選擇比(bi)較重要。
3.空(kong)(kong)氣(qi)(qi)加(jia)熱(re)(re)(re)器(qi)(qi)中(zhong)空(kong)(kong)氣(qi)(qi)終溫(wen)T2提(ti)高時(shi)(shi),由于(yu)空(kong)(kong)氣(qi)(qi)粘性(xing)(xing)增加(jia),氣(qi)(qi)體雷諾(nuo)數減小,使得對(dui)流換(huan)(huan)熱(re)(re)(re)強(qiang)度降(jiang)低(di),空(kong)(kong)氣(qi)(qi)加(jia)熱(re)(re)(re)器(qi)(qi)中(zhong)電熱(re)(re)(re)元件(jian)的表面溫(wen)度同時(shi)(shi)上升,紅外碳硫分析儀(yi)使得散熱(re)(re)(re)損失(shi)增加(jia),從(cong)而降(jiang)低(di)換(huan)(huan)熱(re)(re)(re)器(qi)(qi)的效率(lv)。當T2提(ti)高過(guo)大(da)(da)時(shi)(shi),電熱(re)(re)(re)元件(jian)表面的溫(wen)度亦(yi)會大(da)(da)大(da)(da)升高,致使一般(ban)電熱(re)(re)(re)元件(jian)無法承受,故T2的增加(jia)通常(chang)受到(dao)空(kong)(kong)氣(qi)(qi)加(jia)熱(re)(re)(re)器(qi)(qi)中(zhong)電熱(re)(re)(re)元件(jian)材料耐熱(re)(re)(re)性(xing)(xing)能的限(xian)制(zhi)。