Comparing Point-in-Time and Annual DGP Glare Estimates

摘要

Bold the PIT and AG analysis have pros and cons. The former one can reflect glare issue at a specific time with colorful areas to demonstrate glare resources: and the latter one offers a comprehensive picture of glare for a view throughout an entire year at one hour interval. Without an annual evaluation, a senes of glare analysis on the representative days cannot manifest a whole year situation. Especially when evaluating the efficiency of shading devices in terms of reducing glare, the AG calculation is very helpful However, annual calculation is time-consuming with uncertainties The appropnate values of Radiance Parameters has not been researched enough The disconnection results between the PIT and AG evaluation also shows the instability of the latter Neither is the explanation of 8000 cd/m~2 as the threshold provided Moreover, companng with the annual results, both the CIE and Perez sky model demonstrate inconsistent outcomes. A combination of PIT and AG calculation is effective to estimate the glare of a space; nonetheless, a good understanding of both methods, especially the gap caused by the simplified algorithm is necessary. In further research, calculation will be done to generate the correlation between the PIT and AG method under The Perez sky model, along with The recommendations of appropnate Radiance Parameters for AG method.