A dual-scale analysis of a desiccant wheel with a novel organic–inorganic hybrid adsorbent for energy recovery
A dual-scale analysis of a desiccant wheel with a novel organic–inorganic hybrid adsorbent for energy recovery
复制标题
DOI：
10.1016/j.apenergy.2015.10.175
复制
发表时间：
2016-02
期刊：
影响因子：
11.2
通讯作者：
H. Fu;Li-Zhi Zhang;Jian-chang Xu;R. Cai
中科院分区：
文献类型：
--
作者：
H. Fu;Li-Zhi Zhang;Jian-chang Xu;R. Cai
除湿转轮已广泛用于建筑物通风空气的能量回收。这些砂轮的性能受到许多因素的影响，如材料性能，砂轮基体结构，操作条件和流体参数。以往的研究只涉及宏观尺度的传热传质和系统性能，忽略了微观尺度的车轮材料的性质。在这项研究中，提出了一种双尺度建模方法与新型的有机-无机杂化吸附剂（HA）材料，结合高吸附能力与良好的机械耐久性的除湿轮。提出的双尺度模型包括吸附材料的微观分子动力学（MD）子模型，基质通道中的传热传质和系统性能评价的宏观子模型。两个子模型通过信息交换连接在一起，形成双尺度模型。通过建模，研究了材料的微观理化性能、砂轮的宏观结构以及工作参数对系统性能的影响。以双尺度模型为设计工具，对材料组成进行了优化。在高相对湿度条件下，该材料的吸湿能力比硅胶B高2倍。显、潜效分别提高12%和30%。
Desiccant wheels have been extensively used for energy recovery of ventilation air from buildings. Performance of these wheels is influenced by many factors like the material properties, wheel matrix structures, operating conditions and fluid parameters. Previous studies only involved the macro-scale heat and mass transfer in the wheels and the system performance, by neglecting the micro-scale properties of wheel materials. In this study, a dual-scale modeling approach was proposed for a desiccant wheel with a novel organic–inorganic hybrid adsorbent (HA) material which combines high adsorption capability with good mechanical durability. The proposed dual-scale model included a micro-scale molecular dynamics (MD) sub-model for adsorbent material, a macro-scale sub-model for heat and mass transfer in matrix channels and system performance evaluation. The two sub-models were linked together through information exchange to form the dual-scale model. Through modeling, the effects of the micro physical–chemical properties of materials and macro structure of wheels, as well as the operating parameters on system performance were investigated. With the dual-scale model as a design tool, material compositions were optimized. The moisture adsorption capacity of the material was two times higher than that of silica gel B at high relative humidities. Consequently the sensible and latent effectiveness were improved by 12% and 30% respectively.