During construction of the Vdara residential tower in Las Vegas, it was discovered that the curved facade of the building was focusing the energy of the sun into the building site in a pattern that moved across the future swimming pool deck. Loisos + Ubbelohde was hired to characterize the extent , the movement on site, and the intensity of this solar convergence and to work with the team to assess mitigation options. Using a robust, full-spectrum simulation of the phenomena, we identified the locations and times when the convergence would be a concern. To ensure accuracy and reliability of our analysis, we monitored the intensity of the solar convergence using research-grade instruments on-site and used the results to calibrate the simulation.

 

View of multiple reflections of the sun and circumsolar region from a convergence location on site.

SERVICES

We provide accurate predictive or forensic analysis of the impact of solar reflections from building curtain walls. We evaluate both the visual and thermal impacts of solar reflections as well as reflection convergences. We use simulation techniques to quantify the impact of glazing selection and curtainwall design on the building’s surroundings.
• Characterize reflections to understand temporal and spatial patterns
• Use calibrated simulations of solar radiation to quantify intensity and distribution
• Design and evaluate mitigation alternatives

Convergence on site.

Instrumentation installed onsite to measure intensity and effects of solar convergence.

Potential mitigation measures included shading and film for the curtain wall glazing. Working with the architect we initially explored shade structure options. When the owner determined that films would be a preferred direction, we analyzed the physical properties of a wide range of films and assisted in the development of a custom film. We used the calibrated simulation of the convergence to assess the potential impact of implementing these measures, arriving at a solution that added that custom film to the outside surface of the glass. Pool deck umbrellas offer additional shade as needed for comfort. Once the team selected and implemented a solution, we returned to the site to verify that the solution achieved the expected reduction in intensity.

 

Simulations of solar convergence.