Measurement of longwave radiative properties of energy-saving greenhouse screens

Light intensity, temperature, and humidity are key factors affecting photosynthesis, respiration, transpiration. Among these factors, temperature is a crucial parameter to establish an optimal greenhouse climate. Temperature can be controlled by using appropriate climate screen, which has considerable impact on crop quantity quality. The precise measurements of longwave radiative properties screens vital the selection most suitable screen for greenhouses so that desired favorable environment provided plants during nighttime. energy-saving capability also calculated as inputs in physical model. Two approaches have been reported far literature measurement properties, i.e., spectrophotometry wideband radiometry. In this study, we proposed some modified radiation balance methods determining total hemispherical different wide-band radiometers. method applicable materials having zero porosity, partial opacity, asymmetric with 100% solidity. These were not studied previously under natural conditions. existing applied compared, it was found radiometric values obtained from developed methodology similar those literature, whereas gave unstable results reflectance.