The evaluation of bulk charcoal as greenhouse evaporative cooling pad

Abstract

The aim of this study was to evaluate the suitability of bulk charcoal as alternative evaporative cooling pad material used in greenhouses.  A special test setup is designed to evaluate the performance of charcoal pad.  The cooling efficiency and relative humidity difference were evaluated.  The results show that the best average cooling efficiency in 209.58 kg m^-3 charcoal's bulk density at 70%, with 1.38 m s^-1 air velocity and 0.19 kg s^-1water flows for each square meter of pad.

Keywords: greenhouses, evaporative cooling pads, bulk charcoal, pad material