A new method for the thermal characterization of transparent and semi-transparent materials using outdoor measurements and dynamic simulation

Thermal and Electrical Characterization of a Semi-Transparent Dye-Sensitized Photovoltaic Module under Real Operating Conditions

“…Maximum outside air temperature experienced during the period was 26 °C As a first validation check, the air temperature trend inside the old framed box (OF) was compared with the simulation data provided by the STB original model to verify the old calibration accuracy. A RMSE of 2.72 • C was obtained over the whole period of test with a NRMSE of 4% indicating a good agreement with the original calibration [31].…”

“…The Normalized Root Mean Square Error is defined as: In particular, since the DSM has to be the only glazed element hit by solar radiation, it was fundamentally providing the two boxes with a suitable wood frame to shield the glazed pane that hold the DSM. The new frame was bigger than the other used in previous tests of other materials [31]. Owing to the flexibility of the method, it was possible to test a sample with different geometry simply calibrating the STB for the new configuration.…”

“…Here, the method is briefly described. The methodology of STB is more deeply described in previously published works [31].…”

“…The firstly U-value indetermination directly affects the SHGC evaluation. This is mainly due to the low sensitivity of the method to the U-value calculation owing to the small heat flux put into play during the process [31]. For this reason, and also considering the poor fit obtained in Figure 9a, an additional measurement of the U-value was carried out with the same box in indoor conditions to validate the result.…”

“…A RMSE of 2.72 °C was obtained over the whole period of test with a NRMSE of 4% indicating a good agreement with the original calibration [31]. The boxes were positioned at ESTER lab, with two identical glazed elements (reference double pane) facing south.…”