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首页> 外文期刊>Journal of Energy Storage >Numerical study of circular-elliptical double-pipe thermal energy storage systems
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Numerical study of circular-elliptical double-pipe thermal energy storage systems

机译：圆形椭圆双管热能存储系统的数值研究

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摘要

Solar energy is one of the unlimited sustainable energy resources that can be stored for different applications by using latent heat thermal energy storage systems. These systems utilize the phase change process (melting/ solidification) of a phase change material (PCM) for the store and release energy. In the present study, an annulus with an inner ellipse as a thermal energy storage system was numerically investigated which the outer wall is considered as a isolation wall, and the inner wall is employed at a constant temperature. This study investigated the effects of various aspect ratios of the inner ellipse diameters (1, 3/4, 1/2 and 1/3) as well as the angular position of the inner ellipse (90 degrees, 60% 45 degrees, 30 degrees and 0 degrees) during both melting and solidification processes. The results show that the lowest aspect ratio (W = 1/3H) has the best performance during charging (minimum melting time); however, the aspect ratio has no considerable effect on the solidification process. On the study of the ellipse angle, the results reveal that lower melting time is achieved for a higher angle while the solidification time is not varied significantly. The melting time reduces by almost 61% and the efficiency enhances by 26% for the case of W = 1/3H with the angle of 90 degrees compared with the case of aspect ratio =1 (circular case).
机译：太阳能是通过使用潜热热能存储系统可以为不同应用程序存储的无限可持续能源资源之一。这些系统利用相变材料（PCM）的相变处理（PCM）进行商店和释放能量。在本研究中，数值研究了具有内椭圆作为热能存储系统的环形，外壁被认为是隔离壁，并且内壁在恒定温度下采用。本研究研究了内椭圆直径（1,3 / 4,1 / 2和1/3）的各种宽高比的影响以及内椭圆（90度，60％45度，30度的角度位置在熔化和凝固过程中和0度）。结果表明，最低纵横比（W = 1/3H）在充电期间具有最佳性能（最小熔化时间）;然而，纵横比对凝固过程没有相当大的影响。在椭圆角度的研究中，结果表明，在凝固时间没有显着变化，实现较高角度的较低熔断时间。熔化时间几乎减小了几乎61％，而效率为W = 1/3H的情况而增强26％，与纵横比= 1（圆形案例）相比的角度为90度。

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