Numerical investigation of a solar/waste energy driven sorption/desorption cycle employing a novel adsorbent bed
Numerical investigation of a solar/waste energy driven sorption/desorption cycle employing a novel adsorbent bed
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采用新型吸附床的太阳能/废能驱动吸附/解吸循环的数值研究
DOI：
10.1016/j.energy.2018.02.021
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发表时间：
2018
期刊：
影响因子：
9
通讯作者：
Bi Y
中科院分区：
文献类型：
--
作者：
Bi Y
本文对采用新型 LiCl-硅凝胶吸附剂床的太阳能/废能驱动的吸附/解吸循环进行了数值研究。对几种可用于空气干燥的吸附剂材料，例如硅胶、沸石、硅胶卤化物、固结复合干燥剂等进行相互比较，最终选择出最合适的干燥剂材料（即LiCl-Silicon-Gels），其具有80°C的足够再生温度和相对较高的0.5g/g吸湿能力。设计了专用的吸附剂床结构，允许太阳辐射和热空气（由废热产生）穿过，以蒸发床空隙中保留的水。质量和能量守恒原理应用于床内的空气和吸附剂，从而开发出能够表征和评估吸附/解吸循环性能的专业数学模型。在此基础上，同时模拟了由太阳辐射和废热驱动的解吸过程以及相关的吸附过程。吸附/解吸循环的性能，以吸湿量 (Dme)、吸湿/去除效率 (ƞme/ηmr) 和除湿性能系数 (DCOP) 表示，以及它们与主要操作因素的相关性，例如对工作模式的切换时间、过程/再生空气和太阳辐射的参数数据进行了研究和表征。研究结果表明，该系统在典型潮湿气候条件下（即30-35°C和70-80% RH）可以实现良好的性能（即除湿量为7-7.2g/kg，除湿/去除效率为0.4-0.5和0.5-0.57，DCOP为0.35-0.37）。将太阳辐射强度增加到 1,800W/m2 可能会导致 DCOP 显着上升（从 1 到 5）。此外，优化了吸附剂室/床和循环的几何设置，建议气流通道长度为0.7-0.9m，气流转弯数为5-7。从功能上看床位交换时间建议为2.5～3h。与传统吸附系统相比，新系统可节省约90%的化石燃料能源使用。总之，本文首次设计、表征和优化了一种以氯化锂硅凝胶为床填充材料的新型太阳能/废能驱动的吸附/解吸循环，这将有助于在建筑和工业领域实现可持续的空气处理过程，从而为全球范围内的节能、碳减排和可持续发展做出贡献。
This paper presented a numerical investigation into a solar/waste energy driven sorption/desorption cycle employing a novel LiCl-Sillicon-Gels adsorbent bed. Several adsorbent materials available for air drying, e.g., silica gel, zeolites, silica gel haloid compound, consolidated composite desiccant, etc., were compared each other, leading to the selection of a most suitable desiccant material (i.e., LiCl-Sillicon-Gels), which has an adequate regeneration temperature of 80 °C and relatively higher moisture absorption capacity of 0.5 g/g. A dedicated adsorbent bed structure was devised to allow both solar radiation and warm air (generated from the waste heat) to pass through to vaporize the water reserved in the voids of the bed. The mass and energy conservation principles were applied to both air and adsorbent within the bed, leading to the development of a specialist mathematical model able to characterize and evaluate the performance of the sorption/desorption cycle. On this basis, the desorption process driven by both solar radiation and waste heat and associated sorption process were simulated side by side. The performance of the sorption/desorption cycle, represented by moisture extraction volume (Dme), moisture extraction/removal efficiencies (ƞme/ηmr), and dehumidification coefficient of performance (DCOP), and their correlations with the major operational factors, e.g. swapping time of working mode, parametrical data of the process/regeneration air and solar radiation, were investigated and characterized. The results of the research indicated that the system can achieve a good performance (i.e., moisture extraction volume of 7–7.2 g/kg, moisture extraction/removal efficiencies of 0.4–0.5 and 0.5 to 0.57, and DCOP of 0.35–0.37) under a typical wet climatic condition (i.e., 30–35 °C and 70–80% RH). Increasing solar radiation intensity to 1,800 W/m2could lead to a significant rise in DCOP (from 1 to 5). Furthermore, the geometrical set-up of the adsorbent chambers/beds and cycle was optimized, giving the recommended air flow channel length of 0.7–0.9 m and air flow turning number of 5–7. The swapping time of the beds in terms of the function is suggested to 2.5–3 h. Compared to the conventional adsorption system, the new system can achieve around 90% saving in fossil fuel energy use. In summary, the paper made first of its kind effort in designing, characterizing and optimizing a novel solar/waste energy driven sorption/desorption cycle with LiCl-Sillicon-Gels as the bed filling material, which would help realization of the sustainable air treatment process in both building and industrial sectors, thus contributing to the energy saving, carbon emission reduction, as well as sustainable development on the global scale.
开放系统中沸石 FAU 的微波直接加热
DOI：
--
发表时间：
2002
期刊：
影响因子：
--
作者：
JinXiangDONG;Fengwu
通讯作者：
Fengwu
Coolerado 冷却器有助于节省冷却能源和成本：新冷却技术旨在减少峰值负载
DOI：
--
发表时间：
2007
期刊：
影响因子：
--
作者：
R. Robichaud
通讯作者：
R. Robichaud