A three dimensional numerical scheme has been developed to examine geometrical configuration effects on the performance of a single bed adsorption chiller with a trapezoidal aluminum finned flat-tube heat exchanger (FFT HEx). A mathematical distributed model along with the linear driving force (LDF) model and Darcy’s law have been considered to take into account the effects of heat and both intra/inter-grain mass transfer resistances. The developed numerical scheme has also been validated experimentally by using a composite sorbent SWS-1L and water as a working pair. Additionally, rectangular beds with identical working conditions and bed dimensions as the tested trapezoidal beds have been examined in similar details to identify, which type of the fin geometry provides a superior performance. It was found that in this particular HEx, the heat transfer resistance is mainly influenced by both of the fin pitch and height, while the inter-grain mass transfer resistance is independently controlled by the bed length. This fact makes the role of the fin pitch and fin height almost interchangeable with respect to the cycle time and specific cooling power (SCP) especially in rectangular beds. However, the coefficient of performance (COP) is more influenced by the fin height than the fin pitch. In addition, higher SCP can be achieved at smaller bed dimensions at the expense of lower COP. Moreover, it was found that using rectangular bed is more appropriate, since its SCP is either the same or higher than its corresponding trapezoidal bed especially at shorter bed lengths, while COP remains almost the same for both bed types in all considered ranges of bed dimensions. Finally, a bed designing procedure has been proposed for proper designing of effective adsorption HExs based on the performed parametric studies.

已经开发了三维数值方案，以研究几何形状对具有梯形铝翅片扁平管式换热器（FFT HEx）的单床吸附式冷却器的性能的影响。考虑了数学分布模型以及线性驱动力（LDF）模型和达西定律，以考虑热量的影响以及颗粒内部/颗粒间的传质阻力。通过使用复合吸附剂SWS-1L和水作为工作对，对开发的数值方案进行了实验验证。此外，已经对与测试的梯形床具有相同工作条件和床尺寸的矩形床进行了类似的详细检查，以确定哪种类型的翅片几何形状可提供出色的性能。发现在此特定的HEx中，传热阻力主要受翅片间距和高度的影响，而粒间传质阻力则受床长的独立控制。这一事实使得散热片间距和散热片高度的作用在周期时间和特定冷却功率方面几乎可以互换（SCP），尤其是在矩形床上。但是，性能系数（COP）受散热片高度的影响大于散热片间距的影响。另外，可以在较小的床尺寸下获得较高的SCP，但要以较低的COP为代价。此外，发现使用矩形床是更合适的，因为其SCP等于或高于其相应的梯形床，尤其是在较短的床长时，而在所有考虑的床尺寸范围内，两种床的COP都几乎相同。最后，根据所进行的参数研究，提出了一种床设计程序，用于正确设计有效吸附的六溴环十二烷。