Effects of surrounding buildings on air patterns and turbulence in two naturally ventilated mediterranean greenhouses using tri‐sonic anemometry
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López Martínez, Alejandro; Valera Martínez, Diego Luis; Molina Aiz, Francisco Domingo; Peña Fernández, Ana AraceliFecha
2011-08-01Resumen
The aim of the present study is to increase the available information concerning the influence of surrounding buildings on air patterns and turbulence characteristics of the ventilation airflow in greenhouses. With a view to evaluating the possible effect of different obstacles close to greenhouse vents, sonic anemometry has been used. At the side opening, the airflow was mainly horizontal, while at the roof vent it was upward or downward. The vicinity of obstacles to the greenhouse side openings reduced the incoming mean flow up to 79% and increased turbulence. Larger ventilation rates were observed for the leeward roof vent, since the wind impacts directly with the windward side opening without obstacles, with a maximum of 31.6 air exchanges per hour. However, when the roof vent is on the windward side, the wind is partially blocked by another similar greenhouse located upwind, as the outside air enters through the roof vent and exits through the two side openings. In this situation,...