Experimental Evaluation of the Effect of Mecanical Ventilation on Greenhouse Air Temperature

A study was undertaken to evaluate the effect of mechanical ventilation on greenhouse air temperature. The study indicated that the greenhouse air temperature rise above the ambient was 18.2°C when the ambient air temperature was 42°C and insolation 900 W/m². The ventilation rate in the range of 2–3 air change per minute was found to be suitable for a clear polyethylene covered greenhouse. The jute cloth cover over the polyethylene glazing lowered the ventilation rate requirement to 1.4 m/s (1.34 air change per minute).