Journal: Transactions of ASABE 46(3), pp.763-772.
Author: I. Lee, S. Sase, Okusima, A. Ikeguchi, K. Choi, J. Yun
Abstract
A two-dimensional particle image velocimetry (PIV) system installed in a large-sized wind tunnel was used to examine the natural ventilation of fully open roof and Venlo-type multi-span greenhouses. Since the PIV system has rarely been used for large-scale, low-turbulence airflow conditions, the PIV system was investigated to improve its performance and accuracy. The PIV accuracy tests were conducted without any greenhouse models in the wind tunnel because it was very difficult to insert the anemometer sensors in the small-scale greenhouse models, and it was also assumed that the sensor itself could affect natural airflow patterns inside the models. Good results were obtained in the PIV accuracy test, and the errors were shown to be mostly in the -5 to +5% range. Additionally, the natural airflow in 2- to 10-span greenhouses was investigated using the PIV system. The PIV results indicated that the PIV technique was an effective method for evaluating the relative performance of alternative designs of greenhouse and other structures with turbulent interior air distributions.
Keywords. Multi–span greenhouse, Natural ventilation, Particle image velocimetry, PIV, Wind tunnel.
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