[工學(xué)]建筑環(huán)境學(xué)chapter41-2thermalcomfortable-免費(fèi)閱讀
【正文】 此交線以極坐標(biāo)的形式繪制在平面圖上，這就是燈具的配光曲線。 3) The correlated colour temperature (CCT) 相關(guān)色溫 is the absolute temperature of a perfect radiator when the colour apperance of the radiator best matches that of the light source Unit : kelvin (K) ?色溫反映燈光本身的表觀顏色 ?The CCT reflects the apparent color of light itself, ?The lower values of colour temperature indicate light with a higher red content. ? 光源色溫為 6900K表示（ ） ? A 光效很高 ? B 光效很低 ? C 光色偏冷色 ? D 光色偏暖色 ? Some examples of colour temperatures are given below ? Clear sky 晴天 12,00024,000K ? Overcast sky 全陰天 5,0008,000K ? Tubular fluorescent lamps 3,0006,500K ? Tungsten filament lamps 2,7003,100K 4） Colour rendering顯色性 is the ability of a light source to reveal the colour appearance of surfaces. ? reference source such as daylight日光 ? colour rendering index（ Ra) which has a value of 100 for an ideal lamp. ? Practical sources of white light range in Ra value between 50and 90 ?顯色性是指燈光對(duì)其照射的物體的影響作用。 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。 燈具效率 ? 任何材料制成的燈罩，對(duì)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(cè)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(cè)得的光通量之比 how to do Lighting design 照明設(shè)計(jì) 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(shí)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 value
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