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)(re),而降低了(le)空(kong)氣(qi)加(jia)(jia)熱(re)(re)(re)(re)器內電(dian)熱(re)(re)(re)(re)元件表面溫(wen)度,不(bu)僅有利(li)于延長空(kong)氣(qi)加(jia)(jia)熱(re)(re)(re)(re)器電(dian)熱(re)(re)(re)(re)元件的(de)(de)使(shi)用(yong)壽(shou)命(ming),而且使(shi)得(de)(de)空(kong)氣(qi)電(dian)加(jia)(jia)熱(re)(re)(re)(re)器散熱(re)(re)(re)(re)損失(shi)減小,因而空(kong)氣(qi)換熱(re)(re)(re)(re)器的(de)(de)效率提高了(le),但速(su)度如(ru)果(guo)過大,使(shi)得(de)(de)壓(ya)力損失(shi)陡增,這將不(bu)利(li)于加(jia)(jia)熱(re)(re)(re)(re)效率的(de)(de)提高。
2.若其它條件(jian)不變(bian),改(gai)變(bian)表(biao)面負(fu)(fu)荷,空(kong)(kong)氣(qi)加(jia)熱(re)(re)器中(zhong)電(dian)(dian)熱(re)(re)元件(jian)的(de)壁(bi)溫將(jiang)呈直線變(bian)化(hua),如果表(biao)面負(fu)(fu)荷增(zeng)大(da),電(dian)(dian)熱(re)(re)元件(jian)的(de)壁(bi)溫將(jiang)增(zeng)大(da),這將(jiang)降(jiang)低空(kong)(kong)氣(qi)加(jia)熱(re)(re)器中(zhong)電(dian)(dian)熱(re)(re)元件(jian)的(de)使用壽命,但是如果表(biao)面負(fu)(fu)荷過小,壁(bi)溫過低,空(kong)(kong)氣(qi)加(jia)熱(re)(re)器換熱(re)(re)器的(de)效率又(you)降(jiang)低了,所以空(kong)(kong)氣(qi)加(jia)熱(re)(re)器中(zhong)電(dian)(dian)熱(re)(re)元件(jian)的(de)表(biao)面負(fu)(fu)荷的(de)選擇比較(jiao)重要。
3.空氣(qi)加(jia)熱(re)(re)器(qi)中空氣(qi)終溫(wen)T2提高(gao)時(shi)(shi),由(you)于空氣(qi)粘性(xing)增(zeng)加(jia),氣(qi)體雷(lei)諾數減(jian)小(xiao),使(shi)得對流換(huan)熱(re)(re)強度降(jiang)低(di),空氣(qi)加(jia)熱(re)(re)器(qi)中電(dian)熱(re)(re)元件(jian)的表面(mian)溫(wen)度同時(shi)(shi)上(shang)升,紅外(wai)碳硫分析儀使(shi)得散熱(re)(re)損失(shi)增(zeng)加(jia),從而降(jiang)低(di)換(huan)熱(re)(re)器(qi)的效率。當(dang)T2提高(gao)過(guo)大(da)時(shi)(shi),電(dian)熱(re)(re)元件(jian)表面(mian)的溫(wen)度亦(yi)會大(da)大(da)升高(gao),致(zhi)使(shi)一般電(dian)熱(re)(re)元件(jian)無(wu)法承受(shou),故T2的增(zeng)加(jia)通常受(shou)到空氣(qi)加(jia)熱(re)(re)器(qi)中電(dian)熱(re)(re)元件(jian)材料耐熱(re)(re)性(xing)能的限制。