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板式换热器板片波纹形式有哪些?

Author:heat exchanger    Publish time:2022-04-08 19:23:53    View:256

板式换热器板片为压制有波纹、密封槽和角孔的金属薄板,是热交换器的传热元件。波纹不仅可以强化传热,而且可以增加薄板的强度和刚性,从而提高板式换热器的承压能力,并由于促使流体呈湍流状态,故可减轻沉淀物或污垢的形成。

板式换热器板片波纹形式,按几何形状可分为水平平直波纹、人字形波纹、斜波纹、球形波纹、阶梯形波纹等,其中应用较广的是人字形波纹(包括横人字形、纵人字形及斜人字形)和水平平直波纹。

衡量波纹板片性能的优劣,其主要参数有传热效率、流体阻力和承压能力。一般来说,人字形波纹传热效率高、流体阻力大、承压能力好;水平平直波纹板片,相对于人字形,传热效率较低一些,流体阻力小一些,承压能力也稍低。

从流体进出板片角孔的方位区分,可分为单边流和对角流。

按换热器应用不同,常见的也可分宽流道板式换热器板片、冷凝器板片和蒸发器板片。

选择适当的板式换热器板片波纹、板片规格及流程组合,要根据实际的换热工况而定,板片材料除了考虑成型所需的韧性外,更重要的是要考虑材料对流体介质的抗腐蚀能力。

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