Abstract
The aim of the present work is to study, by sonic anemometry, the airflow and distribution of temperature and humidity in a multi-tunnel greenhouse equipped with a pad-fan refrigeration system. Maximum values of air velocity were recorded at the entrance of the pads. In the first meters of air inside the greenhouse, high levels of turbulence intensity were recorded, as the air dampened by the pads mixed with the hot, dry air inside and the air flow cross-section increased. The crop has a clear stabilizing effect on the airflow, producing lower energy levels and turbulence than when the greenhouse is empty. Major temperature gradients were observed both horizontally and vertically inside the greenhouse. The maximum temperature gradient was recorded in a greenhouse without crop, with an increase between the entrance of air through the pad and the exit through the extractor fans of 4.0°C. With a crop in the greenhouse, the maximum difference in temperature was 2.3°C.
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