二次光學構件對燈具效能之研究─以輕鋼架螢光燈具符合節能標章為例

Luminaire Efficacy Study through Secondary Optical Design — A Case Study of T-bar fluorescent lamps for Energy Label Demands

陳志堅(Zhi-Jian Chen)

指導教授 ： 張謙允

中原大學/設計學院/室內設計研究所/碩士(2010年)

https://doi.org/10.6840/cycu201000785

摘要

室內照明耗費大量的用電，基於節能減碳的考量，經濟部於2008年底公告實施CNS14335室內燈具之節能標章規範。依據該規定，室內燈具需滿足發光效率及眩光指數範圍，方能通過認證。目前大部分市售高效率室內燈具多滿足發光效率要求，卻有過大的眩光指數。本研究主要探討眩光指數與燈具二次光學設計之關聯性，選擇辦公室常用的14W×3，2尺×2尺輕鋼架天花板螢光燈具，並藉由更換格柵、側板、及反射底板等構件，調整燈具之二次光學設計，完成不同測試樣本之量測。並以更換其格柵、側板、及反射底板等構件，調整燈管於燈具之二次光學設計，改造成22組測試樣本。所有樣本經配光曲線儀（Goniophotometer）量測發光光度分佈，再以DIALux套裝軟體計算眩光指數、發光效率之差異。
其結果發現，反射底板為影響發光效率與眩光指數的最主要構件，其次為側板，最後為格柵。且僅有底板能夠使此種燈具的發光效率滿足規定。少了反射底板，縱使側板及格柵皆能減低眩光指數，卻難以滿足發光效率的規定。再者，因為側板正好位於燈管兩側，影響縱向眩光較其他構件較顯著。至於格柵，對於橫向及縱向的眩光皆能減低，但對於發光效率只有降低的負面影響。
此外，以電腦模擬軟體進行二次光學元件功能重複性檢驗，同時也建立V形反射底板之寬度、長度、角度變化與圓弧形反射底板之弧面半徑和弧面深度變化及兩種反射底板與光源之距離和底板末端之水平延伸等模擬樣本。進一步探討反射底板各種參數變化，並建立一配光曲線與燈具效率、眩光指數變化趨勢之資料庫。

關鍵字

發光效率 ； 配光曲線 ； 節能標章 ； 眩光指數

並列摘要

To reduce energy consumption in Interior lighting the government issued CNS14335 energy-efficient interior lamp design code. According to the code, a lamp must meet the high “lumen-per-watt ratio” (efficacy), and the low “unified-glare-rating” (UGR) requirements to obtain an energy-efficient label. This is a manufacturing standard way beyond most existing lamp design, particularly in the concern of UGR. To quest into the way to lower the UGR, this research examined one of the most commonly adopted lighting fixtures: 14W×3 T-bar fluorescent lamps. By altering the combination of its constituent members, i.e., louvers, sideway shields, and bottom reflector, the test lamp’s secondary optical design and efficacy-UGR’s causal relationships may be observed. 22 test lamps are assembled and measured by a goniophotomer which layout the spectral power distribution of every lamp for the DIALux lighting calculation program.Through this process, it is found that bottom reflector dominates the efficacy-UGR ratings. Sideway shields and louvers come in second and third places. Of which, the bottom reflector is the only element that controls the efficacy ratio effectively, not the others. Since sideway shields are placed alone the light tubes, they help cut off lengthwise glare effectively. As for the louvers are all placed above light tubes, they help reducing uncomfortable glare both crosswise and lengthwise conspicuously, however, they lower efficacy controversially.

並列關鍵字

Unified Glare Rating ； UGR ； Energy label ； Efficacy ； spectral power distribution

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