整合照度需求與照明節能之照明功率密度基準及簡易圖表法—以辦公空間為例

A New Lighting Power Density Standard and Chart Method for Integrating the Illumination Standard and Energy Saving—Using Offices as an Example

一般評估照明節能的指標並無法同步評估空間的照度值，而照度的事前評估通常需要電腦模擬。對於非專業人士來說，要能在事前掌握光源種類及配置數量有其困難。本研究擬探討可兼顧照度標準與照明節能的把關機制，藉由調整照明功率密度基準，間接把照度標準的評估納入，即用一個係數同時檢討照度標準與照明節能。本研究以電腦模擬的方式，探討了光源種類、光源瓦數大小、室內表面反射率、天花板高度、辦公桌隔板之有無等因子，對全般照明型式辦公空間之作業面平均照度及照明用電密度的影響。本研究發現，在所探討的三種光源之中，LED最為節能，T5次之，T8最耗能。同樣種類的光源中，瓦數較大者較為節能。天花、牆面、地板之反射率減少20%時照明功率密度須提高2～6%、1～4%、4～8%。天花高度每升高0.3m，照明功率密度須提高2%～3%。辦公桌加裝隔板後，照明功率密度須提高12～19%。本研究一併提出了以查表方式快速掌握照明功率密度的圖表法，任何非專業人士均可以查詢圖表的方式，立即掌握空間所需之照明功率密度概略值。使用者僅需決定照度值及擬採用的光源瓦數，即可以簡單算數立刻求出空間所需燈具數量。依照此數量平均分配燈具位置，即可確保完成後的作業面照度值符合原先的設定值。為兼顧照度標準與照明節能，本研究建議辦公空間以500lx做為作業面的平均照度，以8～9W/m2做為照明功率密度的基準。

 

Generally, the indicators for evaluating lighting energy saving cannot simultaneously evaluate the illuminance value, and the pre-evaluation of illuminance usually requires computer simulation. For non-professionals, it is difficult to grasp the type and number of configurations of light sources beforehand. This study intends to explore a mechanism that can take into account both illuminance and energy saving.This study found that among the three light sources discussed, LED is the most energy-efficient, followed by T5, and T8 is the most energy consuming.When the reflectivity of ceiling, wall and floor reduced by 20%, the lighting power density must increase by 2-6%, 1-4% and 4-8%.When the ceiling height increases by 0.3m, the lighting power density must increase by 2% to 3%.Partitions make the lighting power density increase by 12-19%.This research also proposes a chart method for quickly grasping the lighting power density. Users only need to determine the illuminance and the wattage of lights, and the number of lamps required can be calculated immediately by simple calculations.This study recommends 8-9W/m2 as the benchmark for the lighting power density.