在全球暖化與都市熱島效應背景下，熱環境問題日益嚴峻，在台灣，常見的街屋建築地面層常作為店面並採開放式經營，其中多為傳統中小型早餐店。這類空間除面臨烹飪設備產熱問題，其建築形式亦多為狹長型且僅有單一主要通風口，室內通風不良，高溫問題在氣候變遷下更為顯著。然而，多數業者為兼顧成本而不願使用空調，在成本與舒適度間面臨兩難，或受限於既有建築結構與預算，難以導入複雜高成本的改造方案。因此本研究欲探討兼具簡易、經濟、節能效益之水冷系統於此類空間應用後之熱舒適改善及最佳化策略。研究方法採自製小型水冷系統，在不同環境條件及使用策略下進行實驗，並透過問卷調查使用者的TSV與TCV以解析熱環境期待與熱適應行為。研究結果顯示，原始物理環境條件對水冷系統的降溫效果影響極大，在高溫>33°C且低濕<50%RH的環境下得以展現最佳降溫效能，有機會降溫>2°C，而在開放空間中使用水冷有助於維持溫度穩定或減緩升溫幅度、穩定濕度並促進氣流流動之特性。實務應用建議當環境溫度>30°C時將水冷置於開口處，可使TSV在-1至1的舒適範圍內，延長水冷使用時長對氣流循環亦有助益，>60%的受訪者認為風速舒適；25-30°C時將水冷置於室內使用效果較佳，近70%受訪者感覺舒適，但需避免長時間於室內使用導致局部區域過冷，將水冷置於開口處並延長使用時長，對於改善熱舒適與氣流感受效果佳；20-25°C時，建議短暫置於開口處輔助氣流循環為主。另外，若現況完全依賴空調的開放式餐飲空間改為與水冷併用，即使調升設定溫度整體舒適度仍更佳，濕度與氣流滿意度均有提升，稍滿意至滿意的比例增加40%以上。整體而言，在副熱帶開放式餐飲空間中，人可接受更寬廣的溫熱條件、對偏涼環境的適應力較高、可接受微暖(TSV=1)至涼爽(TSV=-2)、對風速要求較高、熱環境偏好微涼(TSV=-1)。水冷的應用在簡易、經濟、舒適間取得平衡，並賦予空間節能的潛力。

Global warming and urban heat island effects intensify thermal environment issues, notably in Taiwan's common open-plan shophouse breakfast eateries. These narrow, poorly ventilated spaces, burdened by cooking heat, face exacerbated high temperatures due to climate change. Operators often shun costly air conditioning, caught between comfort and cost, with limited retrofit options. This study investigates a simple, economical, and energy-efficient evaporative cooling system for thermal comfort improvement, application potential, and optimization strategies in these settings. Methodology involved experiments with a self-made evaporative cooler under varied conditions and usage strategies, with TSV/TCV surveys analyzing user expectations and adaptive behaviors.Results show initial environmental conditions significantly impact cooling. Optimal performance (>2°C reduction) occurred in high-temperature (>33°C), low-humidity (<50%RH) conditions. Evaporative cooling also stabilized temperatures, humidity, and promoted airflow in open spaces. Practical guidelines emerged: at >30°C, placement at openings maintained TSV within -1 to 1, with extended use aiding circulation. Between 25-30°C, indoor use was effective, though overcooling risks with prolonged use; placement at openings with extended use also improved comfort. For 20-25°C, short-term use at openings primarily aided air circulation. Furthermore, combining evaporative cooling with existing air conditioning improved overall comfort and satisfaction even at higher AC setpoints (e.g., 27°C), with satisfaction increasing by over 40%.Overall, users in subtropical open-plan eateries accept wider thermal ranges, adapt well to cooler conditions (TSV 1 to -2), demand higher air speeds, and prefer slightly cool environments (TSV -1). Evaporative cooling offers a balance of simplicity, economy, and comfort, with significant energy-saving potential for these prevalent eateries.

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