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Apr 11, 2023 •141 likes •267 views

SmartSA Vendor Summit Sustainability City of San Antonios Under 1 Roof program PERFORMANCE ASSESSMENT OF HIGHSOLAR REFLECTANCE ROOFS IN SAN ANTONIO HAZEM RASHEDALI, PH.D. Associate Professor, The University of Texas at San Antonio

  1. SmartSA Vendor Summit Sustainability

  2. City of San Antonio’s Under 1 Roof program PERFORMANCE ASSESSMENT OF HIGH‐SOLAR REFLECTANCE ROOFS IN SAN ANTONIO HAZEM RASHED‐ALI, PH.D. Associate Professor, The University of Texas at San Antonio President, Architectural Research Centers Consortium

  3. PROJECT OBJECTIVES • Project has two major objectives: – Assess impact of high solar-reflectance roofs on attic temperatures in different seasons. – Assess impact of high solar-reflectance roofs of home electricity use intensity.

  4. PROJECT METHODOLOGY Phase I includes the monitoring and performance • analysis of 30 homes. An additional 30 homes are currently being monitored. The study included three major parts: • Monitoring, analyzing and comparing average home attic – temperatures pre- and post- roof installation. Analyzing home electricity use (billing) information to – assess the impact of the cool roof installation on electricity use. Utility data were normalized for weather. Surveying home-owners to identify any external factors – that may have affected electricity use.

  5. Outdoor – Pre‐Installation Average Summer Temperature Difference between Attic & ATTIC TEMPERATURE – SUMMER Temperature Difference (°F) -10 10 15 20 25 30 35 40 -5 0 5 1:00 AM 3:00 AM 5:00 AM 7:00 AM 9:00 AM 11:00 AM 1:00 PM 3:00 PM 5:00 PM 7:00 PM 9:00 PM 11:00 PM Outdoor – Post‐Installation Average Summer Temperature Difference between Attic & Temperature Difference (°F) -10 10 15 20 25 30 35 40 -5 0 5 1:00 AM 2:00 AM 3:00 AM 4:00 AM 5:00 AM 6:00 AM 7:00 AM 8:00 AM 9:00 AM 10:00 AM 11:00 AM 12:00 PM 1:00 PM 2:00 PM 3:00 PM 4:00 PM 5:00 PM 6:00 PM 7:00 PM 8:00 PM 9:00 PM 10:00 PM 11:00 PM 12:00 AM

  6. ATTIC TEMPERATURE – SUMMER Temperature Difference (°F) -10 10 15 20 25 30 35 40 -5 0 5 1:00 AM Summer Temperature Difference Pre‐ and Post‐Installation 2:00 AM 3:00 AM 4:00 AM 5:00 AM 6:00 AM 7:00 AM 8:00 AM 9:00 AM 10:00 AM 11:00 AM 12:00 PM 1:00 PM Temperature Difference Post‐ Installation 2:00 PM Temperature Difference Pre‐ Installation 3:00 PM 4:00 PM 5:00 PM 6:00 PM 7:00 PM 8:00 PM 9:00 PM 10:00 PM 11:00 PM 12:00 AM

  7. Outdoor – Pre‐Installation Average Winter Temperature Difference between Attic & ATTIC TEMPERATURE – WINTER Temperature Difference (°F) -10 10 15 20 25 30 35 40 -5 0 5 1:00 AM 3:00 AM 5:00 AM 7:00 AM 9:00 AM 11:00 AM 1:00 PM 3:00 PM 5:00 PM 7:00 PM 9:00 PM 11:00 PM Outdoor – Post‐Installation Average Winter Temperature Difference between Attic & Temperature Difference (°F) -10 10 15 20 25 30 35 40 -5 0 5 1:00 AM 2:00 AM 3:00 AM 4:00 AM 5:00 AM 6:00 AM 7:00 AM 8:00 AM 9:00 AM 10:00 AM 11:00 AM 12:00 PM 1:00 PM 2:00 PM 3:00 PM 4:00 PM 5:00 PM 6:00 PM 7:00 PM 8:00 PM 9:00 PM 10:00 PM 11:00 PM 12:00 AM

  8. Winter Temperature Difference Pre‐ and Post‐Installation ATTIC TEMPERATURE – WINTER Temperature Difference (°F) -10 10 15 20 25 30 35 40 -5 0 5 1:00 AM 2:00 AM 3:00 AM 4:00 AM 5:00 AM 6:00 AM 7:00 AM 8:00 AM 9:00 AM 10:00 AM 11:00 AM 12:00 PM 1:00 PM Temperature Difference Pre‐Installation Temperature Difference Post‐Installation 2:00 PM 3:00 PM 4:00 PM 5:00 PM 6:00 PM 7:00 PM 8:00 PM 9:00 PM 10:00 PM 11:00 PM 12:00 AM

  9. ELECTRICITY USE INTENSITY 35.3 Homes wo/ Central AC except excluded 36.7 34.6 Homes wo/ Central AC 35.0 34.9 Homes w/Central AC 39.9 35.1 All homes except excuded 37.9 34.4 All homes 36.3 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 Post‐Installation WN EUI (kBtu/ft2.yr) Pre‐Installation WN EUI (kBtu/ft2.yr) Pre‐and Post‐installation EUI for Phase I Homes

  10. ELECTRICITY USE INTENSITY Homes wo/ Central AC except excluded ‐3.9% Homes wo/ Central AC ‐1.1% Homes w/Central AC ‐12.5% All homes except excuded ‐7.3% All homes ‐5.1% ‐20.0% ‐18.0% ‐16.0% ‐14.0% ‐12.0% ‐10.0% ‐8.0% ‐6.0% ‐4.0% ‐2.0% 0.0% Percentage of Reduction in EUI for Phase I Homes

  11. THNK YOU Hazem Rashed‐Ali, Ph.D. Associate Professor, The University of Texas at San Antonio President, Architectural Research Centers Consortium hazem.rashedali@utsa.edu

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