《板式换热器课程设计》.doc

101的油与水换热时,列管式换热器的K值大约为115~470)(2℃?mW,而板式换热器的传热系数为管式换热器的2~4倍,则可初估K为1000)(2℃?mW。初估换热面积083.10667.2710001035??????tmKQS逆项目油水定性温度5524070???t℃46.262919.3220???t℃物性参数CmWsPaCkgkJCkJkgCp?????????????21311112.0102.38.1850???mWsPaCkgkJmkgCp611.010624.8178.46.996242232????????????10初选BR0.1型板式换热器,其单通道横截面积为24104.8m??,实际单板换热面积为0.1152m2。初选组装形式为181928.101006???。92?为油的流程,程数为2,每程通道数为9;181?为水的流程,程数为1,通道数为18;换热面积为10.8m2因所选版型为混流,采用列管式换热器的温差校正系数:258.0207020919.32322.220919.32407011121221??????????????tTttttTTPR查单壳程温差校正系数图,得?=0.97.℃逆837.2697.0667.26???????ttmm初估换热器面积2518.11837.261000103mKQStm??????5.核算总传热系数K(1)油侧的对流传热系数?1流速smu615.000118.098503600200001?????采用0.1m2人字形板式换热器,其板间距mm4.4??。当量直径mmDe8.84.422?????14.043.017.011133111131111)(18.04812.0102.3108.11438102.3615.0850008.0PrRePrRe????????weeDCpuD???????????????