Photovoltaic Roofing Shingle Nail Zones for Secure Fastening
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Solution Overview
Problem
Existing roofing systems face challenges in securely fastening photovoltaic modules to roof decks without compromising the integrity of the modules or the roof structure, particularly due to the need for effective nail zones that allow for secure installation while minimizing damage.
Innovation Solution
The implementation of photovoltaic modules with a backsheet featuring longitudinal grooves that define a nail zone, allowing for the secure fastening of the modules to the roof deck using fasteners, while maintaining module integrity and reducing potential damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If fasteners are used to secure photovoltaic modules to the roof deck, then the stability and secure installation of the modules is improved, but the integrity of the modules may be compromised due to potential damage from fastener penetration
Solution Approach 1:
The backsheet is designed with a nail zone that has different properties than the rest of the backsheet. This nail zone includes reduced thickness and/or reduced material density, creating a localized area that is more compliant and easier for fasteners to penetrate without damaging the solar cells or compromising overall module integrity.
Solution Approach 2:
The backsheet is segmented into distinct zones: a nail zone for fastener penetration and non-nail zones for maintaining structural integrity and weather protection. This segmentation is achieved through varying the thickness or material density in specific regions, allowing the backsheet to serve multiple functions in different areas.
2Strength
If the backsheet material is made more durable and resistant, then the protection and longevity of the photovoltaic module is improved, but the ease of fastening to the roof deck deteriorates due to difficulty in penetration
Solution Approach 1:
The backsheet exhibits local quality variations where the nail zone has reduced thickness or material density compared to the rest of the backsheet. This allows the overall backsheet to maintain high durability and weather resistance while the nail zone provides easy penetration for fasteners during installation.
Solution Approach 2:
The physical parameters of the backsheet (thickness, material density) are changed locally in the nail zone to create a gradient structure. This parameter variation enables the backsheet to be both durable for long-term protection and easily fastened during installation, resolving the contradiction between strength and ease of fastening.
Data Source
AI summary
A system, including: a roof deck; a plurality of photovoltaic modules installed on the roof deck, each of the plurality of photovoltaic modules having: a solar cell, and a backsheet, where the solar cell is positioned on the backsheet, where the backsheet has a headlap portion, where the headlap portion has a first longitudinal groove and a second longitudinal groove, where the first longitudinal groove is spaced apart from the second longitudinal groove on the backsheet, to define a nail zone between the first longitudinal groove and the second longitudinal groove; and a plurality of fasteners installed so as to penetrate the nail zones of the plurality of photovoltaic modules and the roof deck.