本研究背景為在Covid-19興起下，室內換氣的議題逐漸獲得重視，而本研究對於某大專院校內中大型講廳的空調換氣設備進行調查，並從中發現配置不完全的空調換氣設備系統。常規設計之空調設備系統會設有外氣(Outdoor Air, OA )、排氣(Exhaust Air, OA )、回風(Return Air, RA)及送風(Supply Air, SA)四個風管，而配置不完全之空調設備系統缺少了排氣風管，因而導致空間出現換氣量不平衡現象及室內空調噪音，而過去相關文獻討論多以常規設計之空調設備系統為背景，鮮少對於配置不完全之設備系統進行研究及討論，而本研究之目的即為深入了解如此配置不完全之設備系統對於空間之影響及是否影響其設備換氣效益。本研究之研究方法是以示蹤氣體追蹤法進行換氣次數實驗，實驗背景以調整外氣及回風風閥的通氣量作為不同空調配置搭配空間開口作為室內空氣出口，並得出最合適空間之空調配置。本研究實驗後發現研究場域原有空調設備系統無法符合室內可容納人數之換氣量，且因講廳密閉性佳，如不開啟空調設備系統幾乎沒有換氣量，而在不同實驗條件中以外氣風管75%通氣量搭配回風風管25%通氣量(以下簡稱OA75-RA25)為換氣次數最佳之空調配置，而室內噪音分佈受到回風管線設計之影響使整體測量結果顯示回風通氣量越多，噪音量約高；另外為缺乏排氣風管明顯為造成室內出現換氣量不平衡現象之原因，因當提供空間開口即可將室內外壓差降至趨近於0。最後本研究依據實驗結果歸納提出適用於配置不完全之空調換氣設備系統的使用及管理建議，並另對於一般講廳歸納出可參考之建議。

The background of this study is the growing concern for indoor ventilation in the context of the Covid-19 pandemic. The study investigates the air conditioning and ventilation systems in a large lecture hall at a certain college and identifies an incomplete configuration of the equipment. Conventional air conditioning systems typically consist of four ducts: outdoor air (OA), exhaust air (EA), return air (RA), and supply air (SA). However, the incomplete system in question lacks an exhaust air duct, leading to imbalanced ventilation and indoor air conditioning noise. Previous literature mainly discusses conventional air conditioning systems and rarely explores or discusses incomplete configurations. The objective of this study is to gain in-depth understanding of the impact of such an incomplete system on the space and its ventilation efficiency.
The research methodology involves conducting ventilation frequency experiments using tracer gas tracking. The experiments involve adjusting the airflow rates of outdoor air and return air dampers and using openings in the space as indoor air outlets, ultimately determining the most suitable air conditioning configuration for the space. The study finds that the existing air conditioning system in the research area fails to provide sufficient ventilation for the occupancy level of the lecture hall. The hall's high airtightness results in negligible ventilation without the air conditioning system running. Among different experimental conditions, the best ventilation configuration is achieved with 75% airflow through the outdoor air duct and 25% airflow through the return air duct (referred to as OA75-RA25). The distribution of indoor noise is influenced by the design of the return air ducts, with higher noise levels observed when there is greater return air flow. Additionally, the lack of an exhaust air duct is a significant cause of the imbalanced ventilation. However, this issue can be mitigated by providing space openings, which reduce the indoor-outdoor pressure difference close to zero. Based on the experimental results, the study presents recommendations for the use and management of incomplete air conditioning and ventilation systems, as well as general suggestions applicable to lecture halls.

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