精品文献
塑料管壳价格
几种塑料管的性能价格比较
几种塑料管的性能价格比较 目前各国对热水系统用塑料管的选择，均遵循 ISO/DIS 10508 “冷热水用热塑性塑料管材和管件”标准的 规定。这里把交联聚乙烯管和铝塑复合管也归并为热塑性塑料管之列，它们的比较如下表： 塑料管 比较内容 交联高密度聚 乙烯管 聚丁烯 -1 管 聚丙烯管 铝塑复合管 备 注 代 号 PEXa PEXb PEXc PB PP-H PP-B PP-R PE-AL-PE PE-AL- PEXb PEXb-AL- PEXb PEXa：过氧化物交联，交联 度≥70% PEXb：硅烷交联，交联度 ≥65% PEXc：辐射交联，交联度 ≥60% 110℃8760 小时试验 可 通 过 可 通 过 可 通 过 不详 ISO 9080 规定 Po 塑料管材 只有通过此试验，才可推导 70℃下其使用寿命达 50年 热强度 最高 较高 低 较高 * * 高温分层
充碳塑料管壳式增湿-去湿淡化装置及过程:模拟和实验研究(英文)
充碳塑料管壳式增湿-去湿淡化装置及过程:模拟和实验研究(英文)
The modelling and experimental investigation of a thermally coupled humidification-dehumidification desalination process using a carbon-filled-polypropylene shell-tube column are presented.A heat/mass transfer model is established to study the correlation among productivity,thermal efficiency,physicochemical parameters (gas/liquid phase temperature,heat/mass transfer coefficient,Reynolds number etc.),and operating conditions(the temperature of feed water,the flow rates of external steam,feed water,and carrier air);at the same time,the effects of operating conditions on the productivity and thermal eficiency of the column are investigated both theoretically and experimentally,which indicate that the optimum flow rates of external steam,feed water,and carrier gas are 0.18,60,and 10kg.h- 1,respectively,and the higher the feed water temperature(≤95℃)is,the greater the productivity and the thermal efficiency will be.Furthermore,performance comparison with the previous study shows that the condensate productivity of this carbon-filled-plastic column is not lower than that of the copper column,which demonstrates the practicability and feasibility of applying such a plastic column to the humidification-dehumidification desalination process.