期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 43, 期 24, 页码 4419-4431出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0017-9310(00)00072-7
关键词
adsorption; silica gel; switching frequency; heat exchanger design; system performance
This article presents a numerical investigation of the heat exchanger design effect on the performance of closed cycle, two-bed adsorption cooling systems with silica gel as adsorbent and water as refrigerant. It is well known that the shorter the cycle time, lower is the performance (cooling capacity and coefficient of performance). A long cycle time is responsible for lower cooling capacity. In this study, a non-dimensional switching frequency, which is inversely proportional to the cycle time, is defined and an optimum switching frequency is derived based on parametric analysis, The effect of other heat exchanger design parameters such as adsorbent number of transfer unit (NTU), bed Blot number (Bi), the heat exchanger aspect ratio (Ar) and the ratio of fluid channel radius to the adsorbent thickness (Hr), on the system performance has been investigated. The results show that the switching frequency omega, bed NTU, Al and bed Bi have strong effects on the system performance. It is also seen that for a given set of design parameters, the system has an optimum switching frequency and the system performance will be declined seriously if the system is not operated at optimum switching frequency. The optimum switching frequency increases with the increase of NTU, Hi and with the decrease of Bi and Ar. (C) 2000 Elsevier Science Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据