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The influence of periodic operation on the characteristics of adsorption devices

机译：周期性操作对吸附装置特性的影响

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In this paper, we elaborate on the improvement of the design of adsorption heat pump cycles by combining economic and thermodynamic information. A method is used, which results in a relation between the performance and the specific cost of the device. The performance, of course, is given in terms of COP. The cost is approximated by a figure for the required area for heat exchange, which includes all the cost for the heat exchange equipment that is required to exchange heat with the environment (hot and cold heat source, heat sink). Because these costs represent a major part of the investment cost for the device, we use it our calculations. The resulting relation between the COP and the area cost is representative for the specific device. It is represented in the "optimal operational plot", which is the maximal efficiency (COP) against the required heat exchange area. The study is performed on a standard, single stage, zeolite-water adsorption device with two adsorbers and an internal heat recovery. Usually, continuously operating devices perform better than discontinuously operating ones. The cyclic behaviour has some consequences, e.g. same design for adsorber and desorber, thermal cycling of adsorbers, importance of inactive thermal mass and different approaches to internal heat recovery. The effect of these items on the optimisation results is presented in this study. It is shown how the periodic operation results in a decrease in COP and an increase in the specific heat exchange area, i.e. the cost. The increase in exchange area depends mainly on the duration of the phase, where no cooling energy is produced, while the decrease in COP depends mainly on the inactive thermal mass.
机译：在本文中，我们通过结合经济和热力学信息来详细说明吸附式热泵循环设计的改进。使用一种方法，该方法导致设备的性能与特定成本之间的关系。性能当然是根据COP给出的。该成本可以通过热交换所需面积的数字来近似估算，其中包括与环境进行热交换所需的所有热交换设备成本（冷热源，散热器）。由于这些成本占设备投资成本的主要部分，因此我们将其用于计算。 COP与面积成本之间的关系代表了特定设备。它以“最佳运行图”表示，它是相对于所需换热面积的最大效率（COP）。该研究在具有两个吸附器和内部热量回收的标准单级沸石-水吸附装置上进行。通常，连续运行的设备比不连续运行的设备性能更好。循环行为会产生一些后果，例如吸附器和解吸器的设计相同，吸附器的热循环，惰性热质的重要性以及内部热回收的不同方法。这些项对优化结果的影响将在本研究中介绍。示出了周期性操作如何导致COP降低和比热交换面积即成本增加。交换面积的增加主要取决于阶段的持续时间，在该阶段不产生冷却能量，而COP的减少主要取决于非活动的热质量。

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