報告書番号

U90079

タイトル（和文）

野菜工場の実用化（１）流液式（ＮＦＴ）栽培装置と夜間電力利用空調装置の開発

タイトル（英文）

DEVELOPMENT OF VEGETABLE FACTORY FOR COMMERCIAL USE(1)DEVELOPMENT OF HYDROPONIC SYSTEM BY NFT AND AIR CONDITIONING SYSTEM BY OFF-PEAK ELECTRICITY

概要 （図表や脚注は「報告書全文」に掲載しております）

ホウレンソウ，サラダナなどを生産する野菜工場の実用化を図るため連続生産が可能な流液式（ＮＦＴ）の栽培装置と製作費の安い夜間電力利用空調装置を開発した。実用野菜工場の栽培面積を約２１６ｍ２と想定した場合，流液式の栽培装置によるホウレンソウの生産量は約４５ｋｇ／日，サラダナの生産量は約４３ｋｇ／日になると予測される。また，作業時間は，ホウレンソウの生産で，延べ１２時間４０分／日と予測され，２名で運営できる。空調装置は，夜間電力により水を冷却，加熱して水槽に蓄え，簡易な熱交換装置により栽培室の冷，暖房を行う方式である。上記の実用野菜工場では１５ｋＷのヒートポンプ，水量２５ｍ３の水槽，ダクト表面積２９０ｍ２の熱交換装置および日射透過率６０％の遮光カーテンを装備する。これにより，関東地方の夏期の最大冷房負荷発生日に，ヒートポンプの消費電力量は約２７０ｋＷｈ／日で，その約５０％を夜間電

概要 （英文）

A VEGETABLE FACTORY USING OFF-PEAK ELECTRICITY FOR AIR CONDITIONING,AND SUNLIGHT SUPPLEMENTED BY ARTIFICIAL LIGHT,HAS BEEN DEVELOPED TO LEVEL ELECTRICITY DEMAND AND TO GROW CHEMICAL-FREEVEGETABLES USING LABOR-SAVING PROTECTED CULTIVATION. A MOVING HYDROPONIC SYSTEM WITH SPACING DETERMINED BY THE VEGETABLE GROWTH WAS DESIGNED ON THE BASIS OF NFT TECHNOLOGY FOR STABLE CONTINUOUS PRODUCTION. THE PRODUCTION OF VEGETABLES AND LABOR TIME FOR A COMMERCIAL FLOOR AREA OF 312 SQUARE M AND A CULTIVATION AREA OF 216 SQUARE M WERE ESTIMATED BY FROM THE EXPERIMENTAL RESULTS. THE AMOUNT OF SPINACH AND LEAF LETTUCE PRODUCED WAS ESTIMATED AT ABOUT 45 KG/DAY IN SUMMER AND 43 KG/DAY ON AVERAGE,RESPECTIVELY. THE LABOR TIME WAS ESTIMATED AT 12 HOURS AND 40 MINUTESPER DAY. THEREFORE,THE FACILITIES COULD BE OPERATED BY TWO PEOPLE. THEAIR CONDITIONING SYSTEM USED OFF-PEAK ELECTRICITY AND WAS DESIGNED TO REDUCE PRODUCTION COSTS. IT IS COMPOSED OF A HEAT-PUMP FOR THE HEAT SOURCE,A WATER RESERVOIR FOR HEAT STORAGE,AND A NEWLY-DESIGNED HEAT EXCHANGER USING PLASTIC TUBE TO EXCHANGE HEAT FROM THE WATER TO AIR. COMMERCIAL FACILITIES REQUIRE A 15 KW HEAT-PUMP,25 CUBE M WATER RESERVOIR AND 290 SQUARE M HEAT EXCHANGER,AND A SHADING SCREEN WITH 60% TRANSMISSIVITYFOR COOLING IN SUMMER. THE FACILITIES NEED 270 KWH/DAY TO COOL THE AIRBELOW 30 DEGREE ON THE HOTLEST DAY IN THE KANTO REGION OF JAPAN. HALF THE ELECTRICITY IS OFF-PEAK ELECTRICITY.

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