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

Abstract

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 18.2degreeC when the ambient air temperature was 42degreeC 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).