Conclusion
Impact of uncertainty in ground reflectance is practiced in this study. This value in EnergyPlus is considering as average monthly equal 0.2. However, according literature, this value can be varied between 0.05 and 0.45. Regarding to conduct this analysis, two different scenarios are evaluated. First scenario considers a controlled shading strategy and second one assessing the performance of a fix shedder. Total amount of incident solar radiation on the building envelope with the respect of ground radiation uncertainty is evaluated. The uncertainty in ground reflectance is propagate on the building energy model and the analysis are performed for 5 years of weather conditions. In order to propagate this uncertainty, different sets of samples are generated with Monte Carlo sampling. The results provide a better overview of the performance of each scenario, specially, on the lower and upper limits of shading performance also the frequency of incident solar radiation for each hour of a day.
This kind of analysis will be useful for designers to provide a more confidence performance of proposed shading strategies. Also, this analysis can use for analysis related to solar heat gains and inside comfort conditions. This analysis could be used to reduce the performance gap between reality and building energy simulations. As observed in scenario 2.
The future work of this study, will focused on adopting this activities for the different building orientations. Moreover, the more complex building environment, will be considered. Here only variation of ground reflectance was analyzed, however future work can also include the shading parameters on ground (like tree) in order to achieve more realistic model of actual building environment.