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(liu)換熱(re)(re),而(er)降低了空(kong)氣加(jia)(jia)(jia)熱(re)(re)器內電熱(re)(re)元(yuan)件(jian)表面溫度,不僅有利于延長(chang)空(kong)氣加(jia)(jia)(jia)熱(re)(re)器電熱(re)(re)元(yuan)件(jian)的使(shi)用壽命(ming),而(er)且使(shi)得空(kong)氣電加(jia)(jia)(jia)熱(re)(re)器散(san)熱(re)(re)損(sun)失(shi)減小,因而(er)空(kong)氣換熱(re)(re)器的效率提(ti)高(gao)了,但速度如果過大(da),使(shi)得壓力損(sun)失(shi)陡增,這(zhe)將不利于加(jia)(jia)(jia)熱(re)(re)效率的提(ti)高(gao)。
2.若(ruo)其它條件(jian)不變,改(gai)變表(biao)面負(fu)荷,空(kong)氣(qi)加(jia)熱器(qi)中(zhong)電(dian)熱元(yuan)件(jian)的(de)(de)(de)(de)壁(bi)溫將(jiang)呈直線變化(hua),如(ru)果(guo)表(biao)面負(fu)荷增大,電(dian)熱元(yuan)件(jian)的(de)(de)(de)(de)壁(bi)溫將(jiang)增大,這將(jiang)降(jiang)(jiang)低空(kong)氣(qi)加(jia)熱器(qi)中(zhong)電(dian)熱元(yuan)件(jian)的(de)(de)(de)(de)使(shi)用壽命,但是(shi)如(ru)果(guo)表(biao)面負(fu)荷過(guo)小,壁(bi)溫過(guo)低,空(kong)氣(qi)加(jia)熱器(qi)換熱器(qi)的(de)(de)(de)(de)效率又降(jiang)(jiang)低了,所以空(kong)氣(qi)加(jia)熱器(qi)中(zhong)電(dian)熱元(yuan)件(jian)的(de)(de)(de)(de)表(biao)面負(fu)荷的(de)(de)(de)(de)選擇比(bi)較重要(yao)。
3.空(kong)(kong)氣(qi)加(jia)熱(re)器(qi)中(zhong)空(kong)(kong)氣(qi)終溫T2提(ti)高時,由于(yu)空(kong)(kong)氣(qi)粘性增加(jia),氣(qi)體雷(lei)諾(nuo)數減(jian)小,使得對流換(huan)熱(re)強度降低(di),空(kong)(kong)氣(qi)加(jia)熱(re)器(qi)中(zhong)電(dian)(dian)熱(re)元(yuan)件(jian)(jian)的表(biao)面(mian)溫度同(tong)時上升(sheng),紅外(wai)碳硫分析儀使得散熱(re)損失增加(jia),從而(er)降低(di)換(huan)熱(re)器(qi)的效率。當T2提(ti)高過大時,電(dian)(dian)熱(re)元(yuan)件(jian)(jian)表(biao)面(mian)的溫度亦會(hui)大大升(sheng)高,致(zhi)使一般(ban)電(dian)(dian)熱(re)元(yuan)件(jian)(jian)無法承受,故T2的增加(jia)通常受到空(kong)(kong)氣(qi)加(jia)熱(re)器(qi)中(zhong)電(dian)(dian)熱(re)元(yuan)件(jian)(jian)材(cai)料(liao)耐熱(re)性能的限制。