Improvement of energy saving and indoor air quality by using a spot mixing ventilation (SMV) system in a classroom

IF 0.9 4区工程技术 Q3 ENGINEERING, MULTIDISCIPLINARY

Journal of Engineering Research Pub Date : 2024-09-01 DOI:10.1016/j.jer.2023.100147

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引用次数: 0

Abstract

Thermal comfort, energy saving, and room air quality are widely affected by the flow behavior in the occupied zone. In this paper, the concept of a spot mixing ventilation (SMV) system, which aims to supply cold fresh air directly to the occupant seating is developed and examined numerically for use in a typical classroom. Consequently, a proposed SMV system for the classroom was installed over each seated occupant at ceiling level. Occupant’s thermal comfort and energy enhancement were used as the main evaluation index which was employed to assess the performance of the proposed SMV system. The validated computational fluid dynamic (CFD) model was employed in this examination. Four different values of supply temperature, 19 °C, 20 °C, 21 °C, and 22 °C, were examined numerically to evaluate the occupant’s thermal comfort and energy enhancement in the investigated classroom with and without using the SMV system. The results show that the SMV system can reduce the energy demanded by the cooling coil from 4.522 kW as in cases 1, and 2–1.206 kW, 0.9045 kW, and 0.603 kW as in cases 3, 4, and 5 respectively. Furthermore, the SMV system was able to improve the quality of the indoor air by supplying fresh air directly to the seated occupants. It can be concluded that using the SMV concept can provide a significant enhancement in indoor thermal comfort and save more energy.

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在教室中使用定点混合通风（SMV）系统改善节能和室内空气质量

热舒适度、节能和室内空气质量在很大程度上受到占用区域内流动行为的影响。本文提出了定点混合通风（SMV）系统的概念，其目的是将冷的新鲜空气直接送入使用者的座位，并对其在典型教室中的应用进行了数值研究。因此，在天花板上的每个座位上都安装了所建议的教室 SMV 系统。室内人员的热舒适度和节能效果是评估 SMV 系统性能的主要评价指标。本次研究采用了经过验证的计算流体动力学（CFD）模型。对 19 ℃、20 ℃、21 ℃ 和 22 ℃ 四种不同的供应温度值进行了数值检验，以评估在使用和未使用 SMV 系统的情况下，被调查教室内的居住者的热舒适度和能源利用率。结果表明，SMV 系统可减少冷却盘管的能耗，情况 1 为 4.522 千瓦，情况 3、4 和 5 分别为 2-1.206 千瓦、0.9045 千瓦和 0.603 千瓦。此外，SMV 系统还能通过直接向居住者提供新鲜空气来改善室内空气质量。由此可以得出结论，使用 SMV 概念可以显著提高室内热舒适度，并节约更多能源。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Engineering Research ENGINEERING, MULTIDISCIPLINARY-

CiteScore

1.60

自引率

10.00%

发文量

181

审稿时长

20 weeks

期刊介绍： Journal of Engineering Research (JER) is a international, peer reviewed journal which publishes full length original research papers, reviews, case studies related to all areas of Engineering such as: Civil, Mechanical, Industrial, Electrical, Computer, Chemical, Petroleum, Aerospace, Architectural, Biomedical, Coastal, Environmental, Marine & Ocean, Metallurgical & Materials, software, Surveying, Systems and Manufacturing Engineering. In particular, JER focuses on innovative approaches and methods that contribute to solving the environmental and manufacturing problems, which exist primarily in the Arabian Gulf region and the Middle East countries. Kuwait University used to publish the Journal "Kuwait Journal of Science and Engineering" (ISSN: 1024-8684), which included Science and Engineering articles since 1974. In 2011 the decision was taken to split KJSE into two independent Journals - "Journal of Engineering Research "(JER) and "Kuwait Journal of Science" (KJS).