Temperature and Light Intensity under Passively Cooled Natural Ventilated Polyhouse and Shade Net Structure During Summer Season

The high temperature & light intensity inside the natural ventilated polyhouse during summer season is major challenge for cultivation and is a major hindrance in utilizing the polyhouse for round the year cultivation. This study was conducted to evaluate the reduction of temperature & light intensity inside passively cooled polyhouse using various shading configuration in comparison to shade net structure. There is always increase & decrease in minimum & maximum temperature under the polyhouse and shade net structure respectively. The % light transmission under shade net structure is better than polyhouse. Among the various shading configuration, when shade net is used at 0.3 m above the polyhouse roof surface performs best in reducing the temperature inside the polyhouse. However the shade net structure performs better than passively cooled polyhouse using various shading configuration during summer season.