Introduction

Motivations

Previous Work

Apparatus

Design Considerations

Design-Innovation Park

Design- SERC OTF

Operation

Body

Albedo

Status: Methodology complete

Results:

• Specific investigation for a:Si
• Grass and snow correct albedo methodology
• Effects of new methodology on design of a PV system (Similar to third paper?)

Effects of snowfall on a PV system

Results:

• Albedo effects on performance
• Shedding mode analysis
• Quantification of snow losses for 2011
• Correlation between new snow on ground and PV losses as a function of angle
  • Develop algorithm which can be refined with future data
  • Include temperature dependence

Analysis

• • Synthetic days algorithm using sandia model to interpret snow losses
  • Modified Perez model to quantify albedo effects
  • Optical algorithm to determine shedding times
  • Regression of new snow on ground with clearing times for each angle

Design of PV systems in a snowy climate

Results

• Optimal row spacing for albedo, use View 3D to calculate the effects of row spacing on effective view factor
• Seasonal tilt optimization
• Use of emissivity devices for snow clearing
  • Black tedlar backing sheets

Analysis methodology

• Use correlation between snow on ground and PV losses to optimize wintertime angles for snow shedding
• Use Veiw 3D to determine sensitivity of array spacing to albedo boost

Coatings

Results

• Hydrophobic vs. Hydrophyllic vs. Uncoated
• Quantification of economic benefit
• Economic analysis using sensitivity analysis
• Optical Characterization (Dirk's help)

Analysis

• Use synthetic days algorithm to estimate difference in losses
• Use optical algorithm to quantify shedding times
• Optical characterization using Tyler's methodology, effects on performance using AMPS

Prismatic Glass(Supplimental)

Results

• Magnitude of light scattering
• Effects on crystalline panel performance using AMPS
• Validate with test site data, would be very helpful to have non-prismatic panel.

Analysis

• Optical characterization using Tyler's methodology, effects on performance using AMPS

Appendix

Operations manual and documentation- Innovation Park

• Full systems wiring diagram
• Commented CR1000 Code
• Communications overview

Operations manual and documentation- SERC OTF

• Full systems wiring diagram
• Structural diagrams and expansion options
• Commented CR1000 Code
• Communications overview
• Code requirements and system modifications guide
• Calibration certificates and data validation

Programs to Create

• Data import for Innovation park and SERC OTF
• Synthetic Days generation
  • Radiaiton translation with perez model
  • Determination of panel temperature coefficients using Sandia method
  • Adaptive regression accounting for spectrum, snow on panels
• Optical Analysis
  • Cell profiler batch processing of Innovation park photos
    • Account for paralax
  • Automatic alignment of St.Lawrence Photos
  • Cell profiler batch processing of St.Lawrence Photos
    • Account for parallax
  • Generate marker files for snow on panels
• Regression of new snow on ground with clearing times
• View factor calculator
  • View3d
  • Use with modified Prerez to properly account for albedo reflection