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Optimized controls for ventilated wall cavities with spray evaporative cooling systems

机译：带有喷雾蒸发冷却系统的通风腔的优化控制

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Optimal control strategies have been developed to enhance the performance of ventilated cavity walls (VCWs) with spray evaporative cooling systems. In particular, the spray system and three dampers are operated to regulate water usage and cavity air flow in order to maintain indoor thermal comfort, reduce water usage, prevent mold growth risk, and minimize cooling energy consumption. The control strategies have been obtained through multi-objective optimization analysis using genetic algorithm search technique. In particular, it is found that the spray droplet size can be used as a control variable to effectively operate the VCW systems. For residential buildings in Riyadh, it is found that 30 mu m droplets provided the best compromise between indoor thermal comfort, water use, and mold growth potential. The optimal control strategies have been obtained through two approaches: (i) long-term (i.e., one season or one year) optimization based on both outdoor and indoor conditions with a fixed droplet size, and (ii) short-term (i.e., one hour or one-day) optimization that includes the droplet size as a control variable in addition to outdoor and indoor conditions. Using the first approach, the optimal control strategies of buildings equipped with VCWs are found to be able to reduce cooling energy consumption by 23% compared to that used by buildings having conventional concrete walls. The second optimization approach indicates that VCW system is able to provide 100% cooling energy savings compared to the conventional walls. Moreover, the optimum control strategies for VCWs have found to reduce water usage by 78% and mold growth by 98% while maintaining indoor thermal comfort when compared to uncontrolled VCW system. (C) 2017 Elsevier B.V. All rights reserved.
机译：已经开发出最佳控制策略，以通过喷雾蒸发冷却系统增强通风腔壁（VCW）的性能。特别是，操作喷淋系统和三个风门以调节用水量和型腔气流，以保持室内热舒适性，减少用水量，防止霉菌生长的风险并最大程度地降低冷却能耗。通过使用遗传算法搜索技术进行多目标优化分析，获得了控制策略。特别地，发现喷雾液滴尺寸可以用作控制变量以有效地操作VCW系统。对于利雅得的住宅建筑，发现30微米的水滴在室内热舒适度，用水量和霉菌生长潜力之间提供了最佳折衷方案。最佳控制策略是通过两种方法获得的：（i）基于具有固定液滴大小的室外和室内条件的长期（即一个季节或一年）优化，以及（ii）短期（即，一小时或一天）的优化，除了室外和室内条件外，还包括液滴大小作为控制变量。使用第一种方法，发现配备VCW的建筑物的最佳控制策略与具有传统混凝土墙的建筑物相比，能够将冷却能耗降低23％。第二种优化方法表明，与传统墙相比，VCW系统能够节省100％的冷却能源。此外，与不受控制的VCW系统相比，用于VCW的最佳控制策略已发现在保持室内热舒适性的同时，可减少78％的用水量和98％的霉菌生长。 （C）2017 Elsevier B.V.保留所有权利。

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