Numerical and experimental results concerning the emission of a tracer gas (N_2O) inside a naturally ventilated greenhouse are presented and analyzed. Air samples were continuously taken at six points in the greenhouse and in two positions outside the greenhouse using two infrared gas analysers with multiple inlets. The calculations by the numerical model were done for several wind directions and wind speeds. In each set values for the experiments were used for air speed and direction. The comparison between experimental data and simulation results has shown a quantitatively and qualitatively good agreement, since, for the tested cases, the correlation coefficients between measured and numerically obtained values were varied between 0.81 and 0.985. The simulation results provided useful information about the emission of N_2O around the experimental greenhouse and are a first step towards the determination of the behaviour of pesticides around greenhouses, since a similar behaviour should be expected when instead of N_2O, a pesticide is used.
展开▼
