versatility of racking systems to maximize design efficiency
DESCRIPTION
Versatility of Racking Systems to Maximize Design EfficiencyTRANSCRIPT
Versatility of Racking Systems to Maximize
Design Efficiency
q This webinar will be available afterwards at www.solarpowerworldonline.com & email
q Q&A at the end of the presentation q Hashtag for this webinar: #SolarWebinar
Before We Start
Steven Bushong Solar Power World
Moderator Presenter
Mark Dobos HatiCon Solar
Versatility of Racking Systems to Maximize Design Efficiency
Versatility of Racking Systems to Maximize
Design Efficiency
• PV Racking System Design & Information Needed • PV Racking System Installation Considerations & Practices • New Technology
Design Codes
• Design Codes o Site Address
• Current State Code o ASCE 7-05
• IBC 2009 o ASCE 7-10
• IBC 2012 • Exposure B, C, or D
Wind Exposure Explained
o Exposure B - Urban and suburban areas, wooded areas, or other terrain with numerous closely spaced obstructions having the size of single-family dwellings or larger. Exposure B shall be assumed unless the site meets the definition of another type exposure.
o Exposure C - Open terrain with scattered obstructions, including surface undulations or other irregularities, having heights generally less than 30 feet (9144 mm) extending more than 1,500 feet (457 m) from the building site in any quadrant. This exposure shall also apply to any building located within Exposure B type terrain where the building is directly adjacent to open areas of Exposure C type terrain in any quadrant for a distance of more than 600 feet (183 m). This category includes flat open country, grasslands and shorelines in hurricane prone regions.
o Exposure D - Flat, unobstructed areas exposed to wind flowing over open water (excluding shorelines in hurricane prone regions) for a distance of at least 1 mile (1.61 km). Shorelines in Exposure D include inland waterways, the Great Lakes, and coastal areas of California, Oregon, Washington and Alaska. This exposure shall apply only to those buildings and other structures exposed to the wind coming from over the water. Exposure D extends inland from the shoreline a distance of 1500 feet (457 m) or 10 times the height of the building or structure, whichever is greater.
• From International Code Council
Additional Design Information
o Wind & Snow Load o Tilt Angle o Module Mfr., Model, Size o Orientation o String Size o Layout o Size of Project o Projected Start Date
System Types
Ground Mount, Flat/Low Slope, Pitched Roof
o Ground Mount/Open Field • Two Post, Single Post, or
Tracker (single & double axis) • Aluminum or Steel • Geotechnical Soils Report • Footing Type • Pull Tests
Ref: www.distinctdesignconstruction.net
Ground Mount
• Ground Mount – Considerations & Practices o Foundations
• Pile Driving - least expensive and quickest o Vibratory
• Gayk • Turchi • Pile Driver – Hammer Type
• Ballast Blocks o Pre-Cast or Cast on Site
Ref: www.gayk.us
Ground Mount
• Ground Mount o Rack Installation Considerations
• Racking Assembly Efficiency Factors
o Adjustability in Field o Little or No On-site Fabrication
• Panel Installation • Electrical
Flat Roof/Low Slope
• Types o Ballasted o Penetrating o Hybrid
Flat Roof/Low Slope
o Required Design Information • Roof Drawing & Picture • Type of Roof Membrane • Roof Height • Module Mfr. & Model • Orientation • Layout • Roof zones
Flat Roof/Low Slope
• Roof Zones o Zone I – Interior Zone
• Lowest Wind Load • Longer Spans • Less Ballast Needed
o Zone II – Edge Zone • Medium Wind Load • Shorter Spans • More Ballast needed
o Zone III – Corner Zone • High wind Load • Shortest Spans • More Connections • More Ballast Needed
Flat Roof/Low Slope
• Flat Roof Installation Considerations o Ballasted, Penetrating, or Hybrid o Roof Structure Load Limit o Racking Wt/Sq Ft o Roof Membrane
Pitched Roof • Pitched Roof
o Residential
o Commercial
Pitched Roof
o Pitched Roof Design Information • Roof Type • Roof Height • Joist Spacing • Module • Layout • Roof zones
• Thermal breaks – aluminum o Every 40 ft with End clamps
Pitched Roof
• Pitched Roof Installation Considerations o Stagger Penetrations
• Spreads out the Load o Micro Inverter Installation
• Most Attach to Rails Using Hardware (T-Bolts)
Latest Technology
• Bifacial Modules • Integrated Grounded Clamps
And Splices (Hatibond Splice) • Micro Inverters
o Dual Panel o Three Phase Microinverter
• New Metal Roof Attachments o TRP o Angle Plate
Questions? Steven Bushong Solar Power World [email protected] Twitter: @Solar2Steven
Mark Dobos HatiCon Solar [email protected] Phone: 610.577.6702
q This webinar will be available at www.solarpowerworldonline.com & email
q Tweet with hashtag #SolarWebinar
q Connect with Solar Power World
q Discuss this topic on EngineeringExchange.com
Thank You