通过搭建制冷剂气体水合物晶体制备与X射线衍射(XRD)测试装置,制备了以0.10 g SDS作为表面活性剂的R141b气体水合物晶体,获得了水合物结晶过程的反应温度曲线和实验样品的X射线粉末衍射图谱。结合反应温度曲线对实验样品衍射图谱的定性...通过搭建制冷剂气体水合物晶体制备与X射线衍射(XRD)测试装置,制备了以0.10 g SDS作为表面活性剂的R141b气体水合物晶体,获得了水合物结晶过程的反应温度曲线和实验样品的X射线粉末衍射图谱。结合反应温度曲线对实验样品衍射图谱的定性分析,确定了水合物制备过程中仅生成II型笼状水合物晶体;利用绝热法对实验样品的衍射图谱进行物相定量分析,发现制备样品时R141b加入量对样品中II型与Ih型晶体的平均质量之比及两相分布规律具有直接影响;结合气体水合物结晶理论对结晶反应温度曲线和衍射图谱进行了讨论,认为R141b加入量对气体水合物生成的结晶微观环境有关键影响,从而导致结晶反应温度曲线与实验样品衍射图谱呈现较大差异。展开更多
The refrigerant flow distribution in the parallel flow microchannel evaporators is experimentally investigated to study the effect of header configuration.Six different configurations are tested in the same evaporator...The refrigerant flow distribution in the parallel flow microchannel evaporators is experimentally investigated to study the effect of header configuration.Six different configurations are tested in the same evaporator by installing insertion device and partition plate in the header to ensure the consistency of the other structure parameters.The results show that the uniformity of refrigerant flow distribution and the heat transfer rate are greatly improved by reducing the sectional area of header.The heat transfer rate can increase by 67.93%by reducing the sectional area of both inlet and outlet headers.The uniformity of refrigerant flow distribution and the heat transfer rate become worse after installing the partition plate in the insertion devices and changing the inner structure of the header further.展开更多
文摘通过搭建制冷剂气体水合物晶体制备与X射线衍射(XRD)测试装置,制备了以0.10 g SDS作为表面活性剂的R141b气体水合物晶体,获得了水合物结晶过程的反应温度曲线和实验样品的X射线粉末衍射图谱。结合反应温度曲线对实验样品衍射图谱的定性分析,确定了水合物制备过程中仅生成II型笼状水合物晶体;利用绝热法对实验样品的衍射图谱进行物相定量分析,发现制备样品时R141b加入量对样品中II型与Ih型晶体的平均质量之比及两相分布规律具有直接影响;结合气体水合物结晶理论对结晶反应温度曲线和衍射图谱进行了讨论,认为R141b加入量对气体水合物生成的结晶微观环境有关键影响,从而导致结晶反应温度曲线与实验样品衍射图谱呈现较大差异。
基金the Key Industry Common Key-Technology Innovation Project of Chongqing Municipal Science and Committee(No.cstc2015zdcy-ztzx60001)
文摘The refrigerant flow distribution in the parallel flow microchannel evaporators is experimentally investigated to study the effect of header configuration.Six different configurations are tested in the same evaporator by installing insertion device and partition plate in the header to ensure the consistency of the other structure parameters.The results show that the uniformity of refrigerant flow distribution and the heat transfer rate are greatly improved by reducing the sectional area of header.The heat transfer rate can increase by 67.93%by reducing the sectional area of both inlet and outlet headers.The uniformity of refrigerant flow distribution and the heat transfer rate become worse after installing the partition plate in the insertion devices and changing the inner structure of the header further.
