[工學(xué)]建筑環(huán)境學(xué)chapter41-2thermalcomfortable-在線瀏覽
2025-04-11 00:50本頁(yè)面
【正文】 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。s life time. 在美國(guó)，該燈的價(jià)格要高于白熾燈，但整個(gè)壽命內(nèi)可節(jié)約的電費(fèi)達(dá) 40美元 ? Like all fluorescent lamps, CFLs contain mercury, which plicates their disposal 和其他熒光燈一樣， CFLs含有汞蒸氣，處理起來(lái)復(fù)雜 2） Mercury discharge lamps 汞放電燈 ? uses mercury in an excited state激發(fā)狀態(tài) to produce light. ? mercury lamp emits sharp light at certain blue and green wavelengths. 發(fā)藍(lán)、綠光 ?mercury halide lamp鹵汞燈 , better colour rendering high efficacy A metal halide gas discharge lighting system provides illumination for a college baseball game at Olsen Field in College Station, Texas. Note the various colors of the lights as they warm up 3） Sodium discharge lamps鈉放電燈 Lowpressure sodium lamps 低壓鈉燈 Sodium 鈉（發(fā)光） Mercury 汞（緩沖劑和增加放電電抗的作用） xenon 氙氣 （起?。? ? distinctive 鮮明的 yellow light ? gives poor colour rendering . ? Very high efficacy ? been traditionally used for street lighting ? 燈塔指示燈、航道、機(jī)場(chǎng)跑道的照明 Highpressure sodium lamps （ SON）高壓鈉燈 ? produce a continuous spectrum without much blue light ? a colour rendering more acceptable ? used in modern street lighting and for the economic lighting of large areas such as forecourts籃球場(chǎng) and warehouses倉(cāng)庫(kù) . Office building illuminated by high pressure sodium lamps. 無(wú)極燈 ? 高頂棚工業(yè)廠房的照明光源應(yīng)選用 ? 高顯色光源 ? 高光效光源 ? 瞬間啟動(dòng)光源 ? 低色溫光源 Reflection ? We describe the path of light as straightline rays ? Reflection off a flat surface follows a simple rule: ? angle in (incidence) equals angle out (reflection) ? angles measured from surface ―normal‖ (perpendicular) surface normal same angle incident ray exit ray reflected ray Virtual Images in Plane Mirrors If light energy doesn39。t. It is virtually as if the rays were ing from behind the mirror. Virtually: the same as if As far as the eyebrain system is concerned, the effect is the same as would occur if the mirror were absent and the chess piece were actually located at the spot labeled virtual image. ? 低色溫的 光源是（ ） ? 表面溫度高 ? 光色偏青白 ? 光色偏橙黃 ? 光效較高 ? 下列光源顯色指數(shù)高的光源是（ ）
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