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首页> 外文期刊>International journal of green energy >Research on distribution performance of desert sand for heat storage in downcomer
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Research on distribution performance of desert sand for heat storage in downcomer

机译：下降管中蓄热用沙漠沙的分布性能研究

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In this research, desert sand is used as the sensible heat storage medium, which exchanges heat with air in the downcomer to realize heat storage and heat release. The desert sand distribution uniformity has a significant impact on the heat exchange performance and efficiency between desert sand and air for the process of convection in the downcomer. Given the superiority of sensible heat storage in convective heat transfer between desert sand and air, distributors with cylinder or conical bore solid particles and homogeneity performance testing device are designed and manufactured on the basis of convection system equipped with solid particle-air downcomer. Then, the convection experiment between solid sand and air is researched. The greater the desert sand flow rate and higher the volume density, the larger the variance of regional mass flow rate and the worse the homogeneity performance. For the cylinder bore distributor, the smaller the sand particle size is, the greater affected the sand groups can be. The sand homogeneity performance is preferable with the two particle size ranges: 0.18-0.25 mm and 0.15-0.18 mm. The total sand flow rate decreases, but the uniformity improves with the increase of the air flow velocity, and the best distribution performance is achieved at an air velocity of 0.6m/s. However, the distribution performance declines with the air flow velocity persistently increasing because the sand groups are pushed to one pipe side close to the wall. The sand groups deflect seriously with the air flow velocity increasing.
机译：在这项研究中，沙漠砂被用作显热存储介质，它与降液管中的空气进行热交换以实现热存储和放热。对于下降管中的对流过程，沙漠沙分布的均匀性对沙漠沙与空气之间的热交换性能和效率有重要影响。鉴于显热储能在荒漠沙与空气之间的对流换热中具有优越性，因此，在配备有固体颗粒-空气降液管的对流系统的基础上，设计并制造了具有圆柱孔或圆锥孔固体颗粒的分配器以及均质性能测试装置。然后，研究了固体沙子与空气之间的对流实验。沙漠砂流速越大，体积密度越高，区域质量流速的变化越大，均匀性越差。对于缸径分配器，砂粒尺寸越小，受影响的砂团可能越大。在两个粒径范围：0.18-0.25mm和0.15-0.18mm中，砂的均质性能是优选的。总砂流速降低，但均匀度随空气流速的增加而提高，并且在0.6m / s的空气流速下可获得最佳的分配性能。但是，由于砂团被推向靠近壁的一侧，因此随着空气流速的持续增加，分配性能下降。沙团随着空气流速的增加而严重偏转。

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