Vent Cap Assembly for Roof-Mounted Photovoltaic Array Continuity
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Solution Overview
Problem
Roof-mounted solar systems face inefficiencies due to the presence of sewer gas exhaust pipes, which obstruct the placement of solar panels, leading to gaps in the array and reduced energy generation potential, as these pipes cannot be removed without compromising essential drainage functions.
Innovation Solution
A vent cap assembly that fits over and secures to the sewer gas exhaust pipes, allowing for the placement of solar panels while maintaining airflow and preventing debris and water ingress, accommodating various pipe sizes and orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If solar panels are installed to maximize energy generation, then energy production increases, but gaps appear in the array where vent pipes are located
Solution Approach 1:
The vent cap is nested within the solar panel assembly, with the cap fitting over the vent pipe and the solar panel mounted above it. This nesting allows the vent pipe to be contained within the footprint of the solar panel, eliminating gaps in the array while maintaining both functions.
Solution Approach 2:
The invention merges the vent pipe function with the solar panel mounting structure by providing a integrated assembly where the vent cap and solar panel work together as a single unit, allowing the vent pipe to be positioned within the panel's mounting area.
2Shape
If vent pipes are removed to eliminate gaps, then solar array continuity improves, but drainage function is compromised
Solution Approach 1:
The vent cap serves as an intermediary component that mediates between the vent pipe and the solar panel, allowing the panel to be mounted above the pipe while the cap maintains the pipe's drainage function and prevents debris entry.
Solution Approach 2:
The harmful aspect (the visible pipe obstructing the array) is extracted by covering it with the cap, while the useful function (drainage) is preserved through the cap's design that maintains airflow and debris prevention.
3Productivity
If vent pipes are covered to allow panel installation, then energy generation improves, but airflow and debris prevention must be maintained
Solution Approach 1:
The cap is designed with specific local qualities: an open top for airflow, a screened or slotted structure for debris prevention, and a secure fit over the pipe. These localized features address different requirements (airflow, debris protection) in different areas of the same component.
Solution Approach 2:
The cap incorporates porous or perforated structures (screens, slots, or mesh) that allow airflow while blocking debris and water, using the principle of selective permeability to maintain both ventilation and protection functions.
Data Source
AI summary
A vent cap assembly for use with a drain waste vent pipe under roof-mounted photovoltaic (PV) panels is provided. Such vent cap assemblies are adapted to fit over a cut-down roof vent pipe to maintain airflow from the vent pipe and prevent debris from entering the pipe. Vent cap assemblies can include a cap portion and a mounting bracket, the cap portion having an inner cavity accessed through an opening in an underside of the cap and the mounting bracket having one or more inwardly extending elongate members for engaging an outer surface of the vent pipe to secure the cap assembly to the pipe. The mounting bracket can include multiple inwardly extending tabs distributed about the bracket that laterally deflect and securely engage the vent pipe when the cap assembly is pressed onto the pipe.