Metodologie di misura e di calcolo delle caratteristiche radiometriche di materiali di copertura dei fabbricati zootecnici per il controllo delle condizioni microclimatiche estive

The present research proposes a methodology to evaluate the radiometric properties of the constructive materials used for the livestock buildings. Reflectivity measurements of eleven materials in fibrocement, steel and aluminium were carried out in order to assess the capacity of the material to reduce the high temperature inside the livestock buildings during the warm periods. Laboratory tests and elaborations of the measurements showed that the highest value of the reflectivity coefficient in the solar wavelength range, equal to 40.1%, was recorded for a painted steel surface, while the fibrocement surfaces showed values of the reflectivity coefficient higher than 23%. Concerning the emissivity coefficient fibrocement materials showed a value of 99.1% while the painted metals recorded lower values but anyway higher than 90%. Differently the non painted steel recoded a very low emissivity coefficient, equal to 5.7%.