Parametric study of the cyclic behaviour of a hygroscopic matrix in a desiccant airflow system
Parametric study of the cyclic behaviour of a hygroscopic matrix in a desiccant airflow system
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干燥剂气流系统中吸湿基质循环行为的参数研究
DOI：
10.1007/s00231-011-0768-x
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
A. Figueiredo
中科院分区：
文献类型：
--
作者：
C. Ruivo;J. J. Costa;A. Figueiredo
干燥剂气流系统中的传输现象的研究已经在许多研究工作中得到了解决，其中一些涉及冷却，除湿和能量回收的组合过程。在本文中，一个详细的数值模型被用来模拟的行为的平行板通道，周期性地暴露于两个气流具有不同的入口条件，板由基板和干燥剂多孔层。模型化的通道被认为是在稳定状态下操作的吸湿基质的真实的通道的代表，就像它发生在干燥剂或焓转子中一样。处理的数值结果，以代表全球行为的吸湿转子在稳态条件下。参数研究的结果被呈现为两种气流的热质传递速率和出口状态的等值图，考虑不同壁厚的通道，不同厚度的干燥剂和减层，以及宽范围的旋转速度和轮分区。所呈现的映射结果提供了吸湿转子的操作特性的概述，允许快速确定相关参数的值的最佳范围，例如转速和轮分区。因此，该模型是一个有趣的工具，设计和制造目的的焓和干燥剂轮。
The study of the transport phenomena in desiccant airflow systems has been addressed in numerous research works, some of them concerning combined processes of cooling, dehumidification and energy recovery. In this paper a detailed numerical model is used to simulate the behaviour of a parallel-plate channel, cyclically exposed to two airflows with different inlet conditions, the plate being composed by a substrate and a desiccant porous layer. The modelled channel is considered to be representative of a real channel of a hygroscopic matrix that is operating at steady state regime, like it occurs in desiccant or enthalpy rotors. The numerical results are treated in order to represent the global behaviour of the hygroscopic rotor under steady state conditions. Results of a parametric study are presented as maps of isovalues of the heat and mass transfer rates and of the outlet states of both airflows, considering channels of distinct wall thickness, of different thickness of the desiccant and the subtract layers, together with wide ranges of the rotation speed and of the wheel partition. The mapped results presented provide an overview of the operation characteristics of hygroscopic rotors, allowing a quick determination of the optimum range of values for relevant parameters, such as the rotation speed and the wheel partition. The model is thus an interesting tool for design and manufacture purposes of enthalpy and desiccant wheels.