Evaluation of Structural Characteristics of Naturally Ventilated Multi-Span Greenhouses Using Computer Simulation

JARQ : Japan Agricultural Research Quarterly
ISSN 00213551
書誌レコードID(総合目録DB) AA0068709X

Natural ventilation system modifications were evaluated using a computational fluid dynamics (CFD) numerical model (code: Fluent Version 4.5). Wind speed and direction, side vent opening size and location, roof vent opening type, and number of spans were examined in terms of ventilation rates and airflow distribution. For the side vent located at 2.5 m above the floor with a west wind of 2.5 m/s, 59% of the incoming air through the side vent was predicted to move out through the first roof vent opening without reaching distant areas in the greenhouse, resulting in high inside air temperatures. The air mainly moved in through the side vent and fourth roof vent openings for an cast wind of 0.5 m/s while the third and fourth roof openings were the only predicted inlets of airflow for an east wind of 2.5 m/s. The hinged open roof multi-span greenhouses were predicted to have significantly higher natural ventilation rates than the double polyethylene-covered multi-span greenhouses for all the spans in the absence of side vent.

作成者 In-Bok LEE Ted H. SHORT Sadanori SASE Limi OKUSHIMA Guo Yu QIU
国立情報学研究所メタデータ主題語彙集(資源タイプ) Journal Article
開始ページ 247
終了ページ 256
言語 eng