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.