Module temperatures as a function of room-module separation using same meterological and solar irradiance parameters in the model: (a) Peak module temperature (left) and (b) Average module temperature (right). This demonstrates the optimal separation of 10 cm for both the fiber cement and red tile roofing materials and higher optimal separation for the galvanized steel. Simulation also shows the differences in the module temperature, with fiber cement best and galvanized steel worst in considering either peak or average module temperature.