如何选择螺旋板式换热器的型号?
市面上(shang)板(ban)式换(huan)(huan)热器的(de)(de)(de)型号(hao)非常多(duo)(duo),更何况不同厂家的(de)(de)(de)板(ban)式换(huan)(huan)热器,单看我(wo)们(men)(men)天利生物的(de)(de)(de)板(ban)式换(huan)(huan)热器的(de)(de)(de)报(bao)价表,大家就可以(yi)看出(chu),我(wo)们(men)(men)的(de)(de)(de)板(ban)式换(huan)(huan)热器有150多(duo)(duo)种,所以(yi)客户在选(xuan)择(ze)我(wo)们(men)(men)的(de)(de)(de)产(chan)品之前,一定要(yao)(yao)把自己(ji)的(de)(de)(de)需求分析做好,选(xuan)择(ze)合适的(de)(de)(de)板(ban)式换(huan)(huan)热器才是最重要(yao)(yao)的(de)(de)(de),我(wo)们(men)(men)一般建议(yi)客户通过以(yi)下几点来判断自己(ji)要(yao)(yao)选(xuan)择(ze)哪款板(ban)式换(huan)(huan)热器。
通(tong)过我们(men)可以手工简易算(suan)法来选择我们(men)板式(shi)换热(re)器(qi)的型号
计(ji)算(suan)公(gong)式(shi): F=Wq/(K*△T)
式中 F —换热面积 m2
Wq—换热量 W
K —传热系数 W/m2·℃
△T—平均对数温差 ℃
根据选定(ding)(ding)换(huan)(huan)(huan)热(re)(re)(re)(re)(re)系(xi)(xi)统(tong)的(de)(de)有(you)关(guan)参数(shu)(shu),计(ji)算(suan)换(huan)(huan)(huan)热(re)(re)(re)(re)(re)量(liang)、平均对数(shu)(shu)温(wen)差,设定(ding)(ding)传(chuan)(chuan)(chuan)热(re)(re)(re)(re)(re)系(xi)(xi)数(shu)(shu),求出换(huan)(huan)(huan)热(re)(re)(re)(re)(re)面积。选定(ding)(ding)厂(chang)家及换(huan)(huan)(huan)热(re)(re)(re)(re)(re)器型号,计(ji)算(suan)板间流(liu)速,通过厂(chang)家样本提供(gong)的(de)(de)传(chuan)(chuan)(chuan)热(re)(re)(re)(re)(re)特性(xing)曲(qu)线(xian)(xian)及流(liu)阻(zu)特性(xing)曲(qu)线(xian)(xian),查出实(shi)际传(chuan)(chuan)(chuan)热(re)(re)(re)(re)(re)系(xi)(xi)数(shu)(shu)及压(ya)降(jiang)(jiang)。若实(shi)际传(chuan)(chuan)(chuan)热(re)(re)(re)(re)(re)系(xi)(xi)数(shu)(shu)小于(yu)设定(ding)(ding)传(chuan)(chuan)(chuan)热(re)(re)(re)(re)(re)系(xi)(xi)数(shu)(shu),则(ze)应降(jiang)(jiang)低(di)(di)设定(ding)(ding)传(chuan)(chuan)(chuan)热(re)(re)(re)(re)(re)系(xi)(xi)数(shu)(shu),重新计(ji)算(suan)。若实(shi)际传(chuan)(chuan)(chuan)热(re)(re)(re)(re)(re)系(xi)(xi)数(shu)(shu)大于(yu)设定(ding)(ding)传(chuan)(chuan)(chuan)热(re)(re)(re)(re)(re)系(xi)(xi)数(shu)(shu),而实(shi)际压(ya)降(jiang)(jiang)大于(yu)设定(ding)(ding)压(ya)降(jiang)(jiang),则(ze)应进一步降(jiang)(jiang)低(di)(di)设定(ding)(ding)传(chuan)(chuan)(chuan)热(re)(re)(re)(re)(re)系(xi)(xi)数(shu)(shu),增大换(huan)(huan)(huan)热(re)(re)(re)(re)(re)面积,重新计(ji)算(suan)。经(jing)过反复校核,直到计(ji)算(suan)结果(guo)满(man)足换(huan)(huan)(huan)热(re)(re)(re)(re)(re)系(xi)(xi)统(tong)的(de)(de)要求,最终确(que)定(ding)(ding)换(huan)(huan)(huan)热(re)(re)(re)(re)(re)器型号及换(huan)(huan)(huan)热(re)(re)(re)(re)(re)面积大小。这种算(suan)法的(de)(de)优点(dian)是(shi)计(ji)算(suan)简单(dan),步骤少,时(shi)间短;缺点(dian)是(shi)结果(guo)不(bu)准确(que),应用(yong)(yong)范围窄。造成(cheng)结果(guo)不(bu)准确(que)的(de)(de)原(yuan)因主要是(shi)样本所提供(gong)的(de)(de)传(chuan)(chuan)(chuan)热(re)(re)(re)(re)(re)特性(xing)曲(qu)线(xian)(xian)及流(liu)阻(zu)特性(xing)曲(qu)线(xian)(xian)是(shi)一定(ding)(ding)工况条件(jian)下(xia)的(de)(de)曲(qu)线(xian)(xian),而设计(ji)工况可能与(yu)之不(bu)符(fu)。此外(wai)样本所提供(gong)的(de)(de)传(chuan)(chuan)(chuan)热(re)(re)(re)(re)(re)特性(xing)曲(qu)线(xian)(xian)及流(liu)阻(zu)特性(xing)曲(qu)线(xian)(xian)仅为水―水换(huan)(huan)(huan)热(re)(re)(re)(re)(re)系(xi)(xi)统(tong),在使用(yong)(yong)中有(you)很(hen)大的(de)(de)局(ju)限性(xing)。
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