都會區綠屋頂保溫、降溫效益研究

本研究的目的在於驗證住宅區屋頂薄層綠化之日間降溫效果、夜間室內保溫效果、熱傳導及時滯效應。於住宅區設置對照與實驗組，並記錄大氣溫度、對照區、試驗下方、植栽均值及2樓室內溫度變化，進行描述性統計分析及單因子變異數檢定。研究結果顯示中午時段屋頂綠化確實可以降低建築物的屋頂樓地板表面溫度10.2-14.2°C，最高降溫為20.6-26.2°C；另以單因子變異數分析驗證降溫效益，結果顯示不同監測區對太陽輻射熱能隔絕降溫有明顯差異，其中以2樓室內降溫13.9083℃效益最顯著。半夜(24：00)比較分析結果顯示屋頂綠化可保存輻射熱能維持建築物屋頂樓地板表面溫度1.6-2.1°C，最高可溫差高達1.9-4.1°C，具保溫效果。單因子變異數分析結果驗證保溫效益具有差異性，其中以2樓室內保溫2.2464℃效果佳。熱傳導研究結果顯示實驗區平均熱傳導Q為42.53W，對照區平均熱傳導Q為73.40W，屋頂綠化可以降低熱傳導量(42%)，達到降溫效益。時滯效應分析結果顯示相較於對照區，實驗區在16:05-16:15分是室內最高溫度(平均23.98℃)的室內環境，可延遲溫度時間平均約100分，避開用電量尖峰時段，可節省空調耗電量。整體而言，本研究驗證出住宅區屋頂薄層綠化之日間保溫效果、夜間室內保溫效果、熱傳導及時滯效應，若都會區建築物能充分施作綠屋頂，可以減少居家用電量(降低空調系統使用頻率)，初估具有節能(48.8%)的經濟效益。

關鍵字

綠屋頂；保溫；降溫；節能；熱傳導；時滯效應

並列摘要

The purpose of this study was to verify the daytime residential roof greening of the cooling effect, night accumulating of heat effect, thermal conduction and time-lag effect indoors. Set in a residential area in control and experimental groups, and record the ambient temperature, control area, under test, planting mean and the second floor indoor temperature change, descriptive statistical analysis and oneway ANOVA of checks. The results showed that green roofs can indeed noon time reduce the roof of the building surface temperature 10.2-14.2°C. When the maximum cooling of 20.6-26.2°C; the other oneway ANOVA to verify the cooling efficiency, the results show a different monitoring area of solar radiation cooling a significant difference. The 2^(nd) floor indoor cooling temperature is 13.9083℃, and efficiency is the most significant. Midnight (24:00) comparative analysis showed that green roofs it can actually improve energy saving when the building roof temperature is 1.6-2.1°C, the maximum be warmed up to 1.9-4.1°C, thus, achieving the accumulation of heat effect.. oneway ANOVA results show the effectiveness of the accumulation heat have differences, which 2nd floor indoor heat preservation 2.2464℃. Thermal conduction studies showed the average thermal conduction Q in the test zone is 42.53W and control zone is 73.40W, green roofs can reduce the amount of heat conduction by (42%) to achieve cooling efficiency. Time-lag effect showed that compared to the control zone, test zone at 16: 05 to 16: 15 is the highest indoor temperature (average 23.98℃) in the indoor environment, green roofs can be delayed about 100 minutes, to avoid the peak hours of electricity consumption, thus, saving air conditioning power consumption. Overall, this study was to verify the daytime residential roof greening of the cooling effect, night accumulating of heat effect, thermal conduction and time-lag effect indoors , if the building can be applied to the urban area as a green roof can reduce home power consumption ( reducing air conditioning the system uses frequency), initially estimated for energy-savings (48.8%) that economically efficient.