Abstract

One of the main disadvantages of conventional fixed-bed adsorption chillers is the low coefficient of performance due to the high voidage of the sorbent beds. The common method, which can help to handle this problem, is modifying the beds’ design, including the application of fluidization. An innovative idea, shown in the paper, constitutes in the use of the fluidized bed of sorbent, instead of the conventional, fixed-bed, commonly used nowadays in the adsorption chillers. Bed-to-wall heat transfer coefficients for fixed and fluidized beds of adsorbent are determined. Sorbent particles diameters and velocities of fluidizing gas are discussed in the study. The calculations confirmed that the bed-to-wall heat transfer coefficient in the fluidized bed of adsorbent is much higher than that in a conventional bed. The proposed idea allows significantly reducing the size of a chiller and overcome the main reason for the limited dissemination of the adsorption cooling technology.

摘要

常规固定床吸附式冷却器的主要缺点之一是由于吸附剂床的高空隙率而导致性能系数低。可以帮助解决此问题的常用方法是修改床的设计，包括流化的应用。如本文所示，一种创新的想法在于使用吸附剂的流化床，而不是当今在吸附冷却器中常用的常规固定床。确定吸附剂固定床和流化床的床到墙传热系数。研究中讨论了吸附剂的粒径和流化气体的速度。计算证实，吸附剂流化床中的床对壁传热系数远高于常规床中的传热系数。