貨櫃在建築領域的應用具有多項優勢，包括耗費時間和人力成本較低、結構穩固且具有固定模矩等，不論是在臨時性或永久性建築上皆有其發展空間，同時亦可減少廢棄物和二氧化碳排放。由於其規模較小，常以分離式空調滿足冷房需求；在缺乏混合回風及外氣的系統設計下，外氣容易直接影響室內熱環境及設備耗電量。本研究以20呎貨櫃建築為研究對象，欲探討不同空調系統設定下的室內熱環境差異，以及其對人員感受、設備耗電量的影響，並總結日常使用中合適的空調系統設定值。
研究內容由空調設定溫度及換氣次數兩個面向切入，透過實測探討其對室內熱環境的影響。其中，實測項目包含針對生理及心理層面的熱舒適性調查，以及溫度、二氧化碳濃度和設備耗電測量等，並在部分項目中納入了血壓量測。實驗結果顯示，將空調溫度設定在24℃時，人員有最高的舒適度及接受度，同時不會產生過多生理層面的不適反應。而在相同的空調設定溫度下，增加換氣次數雖會造成耗電量提升5~20%不等，且能將室內汙染物控制在標準值；若要在兩者間取得平衡，則應將換氣次數定在4 ACH，此結果與現行換氣量相關規範吻合。另外，若不考慮耗電量的增加，則將換氣次數提高至6~8 ACH可進一步提升整體熱舒適性。
建議若對現有的空調環境感到不滿意，宜優先調整換氣次數，以降低室內汙染物及提高空氣流動感為主，即可在相近的耗電量下，達到較佳的熱舒適性；並避免因降低設定溫度導致的耗電量提升，或是引起冷房環境造成的不適反應。

Recent years, container building has gradually become a common choice for temporary and permanent buildings. This study focuses on 20-foot container buildings to investigate the variations in indoor thermal environments under different air conditioning system settings, and their impacts on thermal comfort and energy consumption. The research explores air conditioning settings from set temperature and air change rate, using experimental measurements to assess their effects on thermal environments. The experimental measurements include assessments of physiological and psychological thermal comfort, as well as measurements of temperature, carbon dioxide levels, and energy consumption.
The results indicate that setting the air conditioning temperature at 24°C achieves the highest level of occupants’ thermal comfort and acceptance without causing significant physiological discomfort. When maintaining the same set temperature, increasing air change rate leads to a 5% to 20% increase in energy consumption, but effectively controls indoor pollutant levels within acceptable standards. Balancing between energy consumption and thermal comfort, an air change rate per hour (ACH) of 4 aligns with existing ventilation standards. Furthermore, increasing the air change rate to 6-8 ACH, disregarding energy consumption, further enhances overall thermal comfort.
The study suggests that if dissatisfaction with the current air conditioning environment arises, adjusting air change rate should be prioritized to reduce indoor pollutants and improve airflow, achieving better thermal comfort at comparable energy consumption levels. This approach avoids the increased energy consumption associated with lowering temperature settings or discomfort caused by overly cold indoor environments.

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