CONVENTIONAL & GREEN ROOF ALBEDO MEASUREMENT AND ANALYSIS FOR ROOF-MOUNTED PHOTOVOLTAIC APPLICATIONS

Open Access
Author:
Perez-Blanco, Jonathan Michael
Area of Honors:
Mechanical Engineering
Degree:
Bachelor of Science
Document Type:
Thesis
Thesis Supervisors:
  • Dr Jeffrey Brownson & Dr Matthew Mench, Thesis Supervisor
  • Jeffrey Brownson, Thesis Supervisor
  • Matthew M Mench, Thesis Supervisor
  • Eric Russell Marsh, Faculty Reader
  • Matthew M Mench, Honors Advisor
Keywords:
  • Green roof
  • green-roof
  • albedo
  • reflectivity
  • plant albedo
  • green roof albedo
  • green-roof albedo
  • photovoltaic
  • photovoltaic green roof
  • photovoltaic green-roof
  • PV green roof
  • PV green-roof
  • roof albedo
  • roof reflectivity
  • green roof reflectivity
  • solar green roof
  • diffuse reflectance
  • integrating sphere
Abstract:
In this work a low-cost integrating sphere is designed and constructed, for the purpose of measuring the albedo of a variety of roofing materials. The albedos of roofing materials including asphalt shingles, black polymer roofing material, green roof soils, and green roof plants are measured. Reflectivity data is referenced to a commercial highreflectivity white-roof sample, generating a reflectance ratio across the visible and infrared spectra for each sample. Absorptance spectra are also generated from the reflectivity data by using the Kubelka-Munk equation. A statistical error analysis is used to determine a wavelength range for which data is acceptable to 95% certainty. Reflectivity data is compared with performance data of copper indium gallium diselenide (CIGS) photovoltaics, to evaluate the appropriateness of various roofing materials for application with roof-mounted cylindrical photovoltaics.