在現代建築營運中，空調系統佔辦公大樓總能耗高達 45% 至 50%。在亞熱帶氣候的台灣，如何在滿足室內熱舒適度以維持員工工作效率的前提下，有效降低空調能源消耗，已成為建築邁向淨零碳排與永續管理的迫切課題。本研究旨在將盤管單元獨立抽離，探討辦公空間中冰水盤管系統的極端操作控制，透過出水溫度設定與風機運轉頻率之交互作用，分析其對室內空間溫度分佈分佈、人體熱舒適指標（PMV）及能耗之綜合影響。
本研究於56.85 m2 的辦公場域進行實驗，以冰水主機出水溫度（5°C 至 15°C）與風機運轉頻率（20Hz/1160CMH、32.7Hz/2320CMH、45Hz/3300CMH）為實驗變因，量測室內各處三種垂直高度（60cm、120cm、160cm）之溫熱環境數據，運用標準差、變異係數進行量化評估。實驗結果顯示，以 20Hz/5°C、32.7Hz/13°C 與 45Hz/15°C 三組組合最能使室內平均溫度接近 25°C 及熱中性的設計目標。然而，深入分析溫度分佈與風速，發現在20Hz設定下，容易導致強烈的垂直溫度分層，頭足部溫差明顯偏高且需耗時較久才能接近舒適區間。相對地， 45Hz設定能促進空氣混合並使溫度分佈更為均勻，但其鄰近出風側及120cm之局部微風速接近 0.2 m/s 的國際熱舒適上限，有較明顯的風速感受。
研究發現在相同風機頻率設定下，出水溫度設定越高，室內溫度越高，空調能耗就越低；相同出水溫度條件下，風機頻率越高，則室內溫度越低，空調能耗越高，此外，若在開機首個小時將出水溫度調降至 5°C，不僅能大幅提升初期降溫斜率，全日運轉能耗更可節省高達 1.34 kWh。最後，本研究運用 TOPSIS 多目標決策評估方法，綜合權衡符合熱舒適PMV的時間長度、溫度分佈均勻度與全日累積能耗。排序結果顯示32.7Hz/13°C能在節能與舒適度間取得最佳折衷的運轉策略。本研究成果除可為既有辦公建築提供具體直觀的局部空調操作指引外，亦為未來設計傳統空調與輻射冷房搭配之「混和型空調系統」時，在防結露邊界控制與局部溫熱環境預測上奠定了關鍵的基礎科學數據。

HVAC systems account for 45%–50% of office building energy consumption. In subtropical Taiwan, balancing energy efficiency and thermal comfort is critical. This study isolates the coil unit to investigate the extreme operational control of a chilled water coil system in a 56.85 m2 office, analyzing the interactive effects of water temperatures (5°C–15°C) and fan frequencies (20/32.7/45Hz) on temperature distribution, PMV, and energy consumption.Results indicate that 20Hz/5°C, 32.7Hz/13°C, and 45Hz/15°C combinations best achieve thermal neutrality near 25°C. Lower frequencies (20Hz) cause significant vertical stratification, while higher frequencies (45Hz) enhance air mixing but introduce a noticeable draft near the 0.2 m/s comfort limit. Furthermore, lowering the water temperature to 5°C in the first hour accelerates initial cooling, saving 1.34 kWh daily. Through TOPSIS multi-objective evaluation, 32.7Hz/13°C is identified as the optimal strategy balancing comfort duration, uniformity, and energy use. These findings provide practical operation guidelines for existing buildings and essential scientific data for boundary control and thermal environment prediction in future hybrid conventional-radiant cooling systems.

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