Pad-fan systems in mediterranean greenhouses: determining optimal setup by sonic anemometry
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López Martínez, Alejandro; Valera Martínez, Diego Luis; Molina Aiz, Francisco Domingo; Peña Fernández, Ana AraceliFecha
2012-04-01Resumen
The present work studies the microclimate and airflow inside a greenhouse equipped with a pad-fan cooling system, analyzing several operational alternatives: three ventilation flow rates (18.1 m3 s-1, 20.2 to 23.5 m3 s-1, and 26.3 m3 s-1), and combining the medium flow rate with two interior fans or with a shading screen. The different airflow levels were obtained using a variable frequency drive (VFD) system to control ventilation fans (working at frequencies of 30, 40, and 50 Hz). The use of interior fans increased the velocity and intensity of the turbulent airflow, thus enhancing the mixing of air inside the greenhouse. The lowest fan frequency (30 Hz) reduced the system’s cooling capacity, increasing both the horizontal and vertical temperature gradients compared to the results obtained for the frequencies of 40 and 50 Hz. The system’s cooling capacity increased using the high-level ventilation flow rate or combining the pad-fan with a shading screen. In both situations, we obtain...