MEASURING THERMAL PARAMETERS OF A BUILDING ENVELOPE

摘要

The method bases on the accurate detection of the difference of temperature between air and surface through thermographic measures, from which thermal parameters such as local thermal flux, quantitatively expressed in W/m2, are calculated. The surface heat exchange between the environment and surface, by convection and radiation, is also locally calculated and measured in separated way. The measure is remotely performed through an IR thermographic system, which completely and partially frames the surface to be tested and a grid, supporting a proper number of specific targets. The method also applies for calculating the thermal transmittance in situ. The measure of the thermal transmittance is got by integrating the detection of the thermal flux on the inner side, measured through this method, with the continuous recording of the external temperature of the surface and/or air obtained with traditional thermometric or thermograpich probes.