実用規模閉鎖型苗生産システムのエネルギ収支

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タイトル別名
  • Energy Balance of a Commercial Scale Closed Transplant Production System.
  • ジツヨウ キボ ヘイサガタ ナエ セイサン システム ノ エネルギ シュウシ

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The energy balance of a commercial scale closed transplant production system was investigated to estimate the energy consumed by the system and to find the optimal strategies of environmental control of the system. The system consisted of a transportation/irrigation machine, four basic modules and thermal insulation wall. The basic module consisted of shelves, lamps, air conditioners, fans and a humidifier. Sweetpotato (IPomoea batatas (L.) Lam. cv. Beniazuma) transplants were grown for 15 days under conditions of 140/200/320μ molm-2s-1 (1-5/6-11/12-15 days after planting, respectively) photosynthetic photon flux with 16h d-1 photoperiod, 28°C air temperature, 74% relative humidity and 990μmol mol-1CO2 concen-tration in the system. The total electric energy consumed by the system during 15 days when four basic modules operated was 764 MJ m-2. The system's lamps, air conditioners, fans, humidifiers and transportation/irrigation machine consumed 78.4%, 10.6%, 7.1%, 0.7% and 3.2% of the total electric energy consumed by the system, respectively. The electric energy cost per transplant, depending on the seasonal electric energy charge, was 2.5-2.6 Yen. The ratio of net chemical energy fixed by transplants to the total electric energy consumed by the system was estimated at 0.006 when the transplants grew normally. The coefficient of performance of the system was 8.0 and about 2 times higher than that described in the catalog of the air conditioner. The maximum percentage of heat energy transported by ventilation and penetra-ted through walls and floor to the cooling load of the system was estimated at 0.18% in summer and -25% in winter.

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