グリーンハウス内の非全層冷房 (第2報)

• スハルディヤント ヘリー

  高知大学農学部

• 松岡 孝尚

  高知大学農学部

書誌事項

タイトル別名

• Studies on a Zone Cooling System in a Greenhouse. 2. Evaluation of a System for Microclimate Modification in a Plastic Greenhouse during Hot Weather.
• Evaluation of a System for Microclimate Modification in a Plastic Greenhouse during Hot Weather

抄録

A zone cooling system was tested to modify the greenhouse microclimate for plant growing with the minimum energy input during hot weather. The cooling system was equipped with perforated polyethylene tubes to distribute cool air from spot coolers into the zone in which spinach plants were grown in pots in a plastic greenhouse during the summer of 1991. The ratio of the cooling capacity of the spot coolers to the floor area of the cooled zone in the greenhouse was 0.18 kW⋅ m^-2. The cooling system was turned on when one of the air temperature sensors at four positions in the plant zone exceeded 30°C and turned off when all the air temperature data at these positions decreased to 27°C. The overall transmissivity of greenhouse cover and shading materials to solar radiation was 0.54. Watering was done to meet the requirements of the spinach plants. The microclimate conditions in the cooled zone were compared with that in a naturally ventilated zone in a similar greenhouse.<BR>During sunny days throughout the experimental period when the daily solar radiation exceeded 18 M J⋅m^-2⋅day^-1, we were able to maintain the daily maximum air temperature in the plant zone from 30.4 to 36.8°C compared to from 32.0 to 39.0°C in the naturally ventilated plant zone. During the above experimental days, the electrical energy required to run the system was 0.57 to 0.68 M J⋅m^-2⋅day^-1, and the daily total cooling time was 8.2 to 9.5 hr⋅day^-1. Under these conditions, the daily degree-hour value in the cooled plant zone was 22 to 2 7°C⋅hr⋅day^-1 lower than that in the naturally ventilated plant zone. The growth of spinach plants in both cooled and naturally ventilated zones showed that the fresh weight of the top part of the spinach plants in the cooled zone exceeded twice that of the naturally ventilated environment on the 45th day after sowing.

収録刊行物

• 生物環境調節

  生物環境調節 30 (4), 143-151, 1992

  日本生物環境工学会

詳細情報

• CRID: 1390282680056808704
• NII論文ID: 130003879510
• DOI: 10.2525/ecb1963.30.143
• ISSN: 21851018
• ISSN: 05824087
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可