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Dynamic modelling and analysis of an adsorption-based power and cooling cogeneration system

机译：基于吸附的电力和冷却热系统的动态建模与分析

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摘要

In this study, an electricity and cooling power cogeneration system is investigated to harvest low-grade heat below 80 degrees C, which consists of a two-bed adsorption-based desalination (AD) system for thermally separating the salt solution into diluted and concentrated solutions while offering cooling power and a reverse electrodialysis (RED) system for converting the Gibbs free energy of mixing of the generated solutions into electricity. The dynamic response of the cogeneration system is presented first, and the asymmetric operation period is analyzed. Then the effects of adsorption/desorption time, switching time, working concentration, working fluid mass, and adsorbents on the electric efficiency, coefficient of performance (COP) and exergy efficiency of the cogeneration system are systematically evaluated. Results reveal that longer adsorption/desorption time leads to degraded electrical efficiency and exergy efficiency, and upgraded COP. Extended switching time contributes to COP and exergy efficiency, however, decreases the electric efficiency. Larger salt concentration improves the electric efficiency, however degrades the exergy efficiency and COP. Increasing working solution mass can augment the electrical efficiency, exergy efficiency and COP. Furthermore, refrigeration performance conflicts with power generation performance for different adsorbents. With CAU-10 as the adsorbent, an exergy efficiency of 30.04% is achieved, meanwhile the electric efficiency and COP is 0.39% and 0.84, respectively at adsorption/desorption time of 900 s, switching time of 10 s and working concentration of 8 mol/kg.
机译：在该研究中，研究了电力和冷却功率热电联产系统以使低级热量收获低于80℃，这包括用于将盐溶液热分离成稀释和浓缩溶液的双床吸附的脱盐（AD）系统同时提供冷却功率和反向电渗析（红色）系统，用于将生成的解决方案混合的GIBBS自由能转换为电力。首先提出了热电联产系统的动态响应，分析了不对称操作周期。然后系统地评估了吸附/解吸时间，切换时间，工作浓度，工作液体质量和吸附剂对电生制系统的性能系数（COP）系数（COP）和效率的效果。结果表明，较长的吸附/解吸时间导致电气效率和高度效率降低，升级的警察。然而，扩展的切换时间有助于COP，效率降低了电效率。较大的盐浓度提高了电效率，然而降低了高级效率和警察。增加工作解决方案质量可以增加电效率，高度效率和警察。此外，制冷性能与不同吸附剂的发电性能发生冲突。用CAU-10作为吸附剂，实现了30.04％的高效率，同时电效率和COP分别为0.39％和0.84，分别在900秒，开关时间和8摩尔的工作浓度和8摩尔工作浓度的0.39％和0.84。 /公斤。

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