報告書番号

482012

タイトル（和文）

水蓄熱式太陽熱暖房温室に関する研究－水耕栽培専用シムテムの性能－

タイトル（英文）

STUDIES ON THE GREENHOUSE HEATING WITH SOLARENERGY USING WATER AS THE STORAGE MEDIUM -PERFORMANCE OF THE SOLAR HEATING SYSTEM FOR WATER CULTURE-

概要 （図表や脚注は「報告書全文」に掲載しております）

水を蓄熱体とした太陽熱暖房温度において，蓄熱槽を温室内に設置し，水耕ベットを兼用させるシステムを開発した。蓄熱槽は，プラスチックフィルムで上下に分割し，上部に水耕液を入れ，下部に蓄熱用の水を入れる。蓄熱水を「水膜式熱交換器」に導き，太陽熱の集熱と夜間の暖房を行う。１ヵ月間の連続試験の結果，このシステムは温室内を１０度に保つのに必要な全暖房熱量の８６％を太陽熱から供給できた。

概要 （英文）

WE HAVE BEEN DEVELOPING THE SOLAR HEATING GREENHOUSE USING WATER AS THE STORAGE MEDIUM,TO ACHIEVE A HIGHER EFFICIENCY AND A LOWER COST.THIS SYSTEM REQUIRES A WATER TANK.FOR ITS EFFICIENCY AND THE CULTIVATION OF CROPS,IT IS NECESSARY TO DETERMINE THE MOST SUITABLE PLACE AND SHAPE. THE NEW SYSTEM FOR THE EXCLUSIVE USE OF WATER CULTURE WAS DEVELOPED AND CONSTRUCTED IN A SMALL GREENHOUSE(3.6MX9M).TWOWATER TANKS(0.5M DEEP;0.6M WIDE AND 6M LONG) WERE INSTALLED AND WERE BURIED 0.35M DEEP IN THE GROUND INSIDE THE GREENHOUSE. EACH WATER TANK SERVED AS A WATER CULTURE BED WAS SEPARATED INTO TWO PARTS BY THIN PLASTIC FILM,I.E.UPPER PART OF THE TANK STORING 0.6 CUBIC M CULTURAL WATER AND LOWER PART STORING 2.4 CUBIC M HEAT STORAGE WATER(FRESH WATER).DAYTIME SOLAR ENERGY COLLECTION AND NIGHTTIME HEATING WERE PERFORMED TO CIRCULATE THE STORAGE WATER IN THE AIR-WATER HEAT EXCHANGER.THE CULTURAL WATER WAS HEATED BY THE STORAGE WATER AND,THEREFORE,IT COULD BE SERVED ASTHE HEAT STORAGE MEDIUM. THE AIR-WATER HEAT EXCHANGER DEVELOPED FOR THIS SYSTEM WAS ADAPTED THE FLAT PLATE HEAT EXCHANGE SURFACES CONSISTING OF NON-WOVEN FABRIC SANDWICHED IN BETWEEN TWO PLASTIC FILMS. THIS SYSTEM WAS ABLE TO MAINTAIN THE AIR TEMPERATURE INSIDE THE GREENHOUSE AT 11 CENTI DEGREE,AND THE TEMPERATURE OF CULTURAL WATER AND HEAT STORAGE WATER RANGED FROM 17 CENTI DEGREE TO 24 CENTI DEGREE WHEN AMBIENT AIR TEMPERATURE WAS -3.5CENTI DEGREE DURING JANUARY.FURTHER,THIS SYSTEM WAS CONTINUOUSLY OPERATED FOR ONE MONTH DURING FEBRUARY.THIS SYSTEM WAS ABLE TO SUPPLY 86% OF THE NIGHTTIME TOTAL HEATING LOAD REQUIRED TO MAINTAIN THE AIR TEMPERATURE ABOUT 10 CENTI DEGREE,AND WATER TEMPERATURE ABOVE 13CENTI DEGREE.

報告者

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