[工學(xué)]建筑環(huán)境學(xué)chapter41-2thermalcomfortable(參考版)
2025-02-25 00:50本頁面
【正文】 燈具效率 ? 任何材料制成的燈罩，對于投射在其表面的光通量都要被它吸收一部分，光源本身也要吸收少量的反射光，余下的才是燈具向周圍空間投射的光通量 ? 在規(guī)定條件下測得的燈具發(fā)射光通量與燈具內(nèi)的全部光源在燈具外按規(guī)定條件測得的光通量之比 how to do Lighting design 照明設(shè)計 First , find the standard service illuminance levels 照度標(biāo)準(zhǔn) Table . P156 for different applications The aim of Lighting design is to reach the illuminance levels Then , choose the luminaires 選擇燈具 use Lumen method 流明法 to calculate the number of lamps needed. L L FUFFAEN???? DLOR )WL(HWLRIm ????房間指數(shù) Hm——mounted height of the luminaire above the working plane L L FUFFAEN????UF= utilisation factor 燈具的利用系數(shù) is the ratio of the total flux reaching the working plane pared to the total flux output of the lamps 光源實際投射到工作面上的有效光通量與全部燈的額定光通量之比 table P158 LLF=light loss factor 光損失系數(shù) is the ratio of the illuminance provided at some given time pared to the initial illuminance At the end of design, we should place these lamps in a regular grid pattern and their spacing must not exceed certain distances. type of luminaire + height at which they set. Typical values are as follows For fluorescent tubes in diffusing luminiaires Smax= For filament lamps in direct luminaires Smax= Figure spacing of luminaires P160 Worked example A factory space measuring 40m by 12m by 4m in height requires a service illuminance of 500lux on the work benches which are set 1m above the floor. The 65W tubular fluorescent lamps chosen have a luminous efficacy of 80lm/W. they are to be mounted on the ceiling in luminaires which have a DLOR of 50%. The room reflectances are for the ceiling and for the wall。 ? 配光曲線上的每一點，表示燈具在該方向上的發(fā)光強度。當(dāng)光強體被通過 z軸的平面截割時，在平面上獲得一封閉的交線。 behind the mirror. do di For a plane mirror: do = di and ho = hi ho hi do = distance from object to mirror di = distance from image to mirror ho = height of object hi = height of image Image is behind mirror: di 0 Illusions, Mirages Lamp and energy conservation 燈與節(jié)能 ? Lighting is an important area of energy conservation in buildings ? a shorter payback period Luminaires 燈具 light fixture or light fitting l a m p ( s ) i t s ofo u t p u t l i g h t l u m i n ai r e ofo u t p u t l i g h t d o w n w a r d sD L O R ?l a m p ( s ) i t s ofo u t p u t l i g h t l u m i n ai r e ofo u t p u t l i g h t u p w a r d sU L O R ?l am p ( s ) i t s ofo u t p u t l i g h t l u m i n ai r e ofo u t p u t l i g h t T o t alL O R ?U L O RD L O R ??L O RLet’s do some judgements Direct 直接向下型 51 General diffusing 普通漫反射型 Semiindirect 半間接型 燈具的配光曲線 ? 任何光源或燈具一旦處于工作狀態(tài)，就必須向四周空間投射光通量。t flow from the image, the image is virtual. Rays seem to e from behind the mirror, but, of course, they don39。 The CIE colour rendering groups Group Ra Importance Typical application 1A 90...100 accurate colour matching Galleries畫廊，美術(shù)館 , medical examinations, colour mixing 1B 80...90 accurate colour judgement Home, hotels, offices, schools 2 60...80 moderate colour rendering Industry, offices, schools 3 40...60 accurate colour renderin
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