報告書番号

483007

タイトル（和文）

環境調整ガラス室内の光量増加方式

タイトル（英文）

INCREASING METHODS OF LIGHT INTENSITY INSIDEENVIRONMENTAL CONTROL GREENHOUSES

概要 （図表や脚注は「報告書全文」に掲載しております）

自然光利用型の人工気象室の光環境条件の改善（増光）を図り，光要求度の高い植物に対する排ガス影響試験を行うため，ガス室内の光環境改善方式について検討した。光ファイバーケーブルとフレネルレンズを組合せた方式では，床面から１０ｃｍの距離に光放出口を置いた場合，床面の日射量は，室外とほぼ等しくなった。また，反射鏡方式ではガラス室内の日射量は室外の約１．１倍に増光された。光ファイバー反射鏡方式とも４００から７４０ｍｍの波長域では波長の組成に変化は認められなかった。曇雨天日では全天日射量に占める散乱日射量の比率が高くなり，両方式とも増光効果を発揮しなかった。

概要 （英文）

IN ORDER TO STUDY INFLUENCE OF AIR POLLUTANTGAS BEING LOW CONCENTRATION AND LONG TERM EXPOSURE,THE NATURAL LIGHT PHYTOTRON WAS ESTABLISHED IN THIS LABORATORY. HOWEVER,LIGHT INTENSITY OFTHE PLANT GROWTH ROOMS OF THIS EQUIPMENT WAS INSUFFICIENT TO GROW PLANTS REQUIRING A LARGE AMOUNT OF LIGHT INTENSITY. IN RECENT YEARS,THE LIGHT CONCENTRATION AND CONDUCTIVE DEVICE BY PLASTIC FRESNEL LENS AND LIGHT CONDUCTIVE FIBER CABLE AND THE MEANS OF LIGHT REFLECTANCE BY HELIOSTAT HAVING BEEN DEVELOPED WITHIN THE TECHNIQUE OF SOLAR POWER GENERATION AND OTHER SOLAR ENERGY UTILIZATIONS.SUCH TECHNIQUES MUST BE ADOPTED FORLIGHT INCREASING METHODS INSIDE THE PLANT GROWTH ROOMS. 1.IN THE LIGHTCONCENTRATION DEVICE USING FOR EXPERIMENTS,THE PLASTIC FRESNEL LENS WAS 35CM IN DIAMETER AND 39CM IN DISTANCE OF FOCUS,LIGHT CONDUCTIVE FIBERCABLE WAS ASSEMBLED 39 FIBERS MADE UP OF A 400 MICRONS GLASS CORE AND CLAD WITH POLIMER.WHEN THE LIGHT OUTLET PORT OF THE FIBER CABLE WAS SITUATED VERTICALLY 50CM DISTANCE FROM THE FLOOR INSIDE THE GROWTH ROOM,LIGHT INTENSITY OF THE FLOOR SURFACE WAS 73.8% OF THE OUTSIDE LIGHT INTENSITY.AND THE OUTLET PORT WAS SETTED AT 10CM,THE LIGHT INTENSITY WAS 95.5% OF THE OUTSIDE,THIS WAS ABOUT 1.4 TIMES AS MUCH AS THE OUTLET PORT WAS REMOVED. 2.THE REFLECTIVE METHODS OF THE HELIOSTAT,WHICH WAS EQUIPEDWITH A FLAT MIRROR,WAS ABLE TO INCREASE THE LIGHT INTENSITY ON THE FLOOR SURFACE IN 110.4% OF THE OUTSIDE,IT WAS FOUND THAT THE INNER LIGHT INTENSITY BECAME HIGHER THAN THE OUTSIDE. 3.IT WAS NOT FOUND THAT BOTH METHODS CHANGED THE SPECTRA COMPOSITIONS IN THE RANGE FROM 400 TO 740 NM. IN RAINY AND CLOUDY DAYS,THE RATIO OF SCATTERED LIGHT INCREASES IN GLOBAL SOLAR RADIATION,BOTH METHODS COULD NOT INCREASE THE LIGHT INTENSITY INSIDE THE GROWTH ROOM.

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