Active Wind Deflector for Rooftop PV Fire Blocking
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Solution Overview
Problem
Rooftop photovoltaic arrays are susceptible to fire damage from hot gases and flames, with existing solutions failing to adequately protect the systems during windy conditions and fire scenarios.
Innovation Solution
An active fire-resistance wind deflector system that remains compressed during normal conditions, redirecting air over PV modules and allowing airflow beneath, featuring a heat-activated fuse that releases to adjust the deflector's position and reduce airflow ports, thereby inhibiting flame spread and hot gas flow during fires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wind deflector is kept in a fixed position to protect PV modules from fire, then fire protection is improved, but wind redirection capability during normal operations deteriorates
Solution Approach 1:
The wind deflector transitions from a static structure to a dynamic one that can change position based on conditions. During normal operations, the deflector is in a first position optimized for wind redirection and cooling. During fire conditions, it moves to a second position optimized for fire protection, thus resolving the contradiction between fixed fire protection and operational flexibility
Solution Approach 2:
The system changes its operational parameters (position and orientation) in response to environmental conditions. The deflector's position is adjusted between two states: one for normal wind management and another for fire protection, allowing the system to optimize performance for different operational scenarios
2Temperature
If the wind deflector allows maximum airflow beneath the PV array for cooling, then cooling efficiency is improved, but fire spread risk deteriorates
Solution Approach 1:
The airflow characteristics of the wind deflector are dynamically adjusted based on environmental conditions. During normal operations, the deflector configuration maximizes airflow beneath the PV array for cooling. During fire conditions, the deflector position changes to restrict airflow, thereby reducing the risk of fire spread while maintaining cooling efficiency during normal operations
Solution Approach 2:
The system modifies its airflow parameters in response to fire detection. The deflector transitions from a high-flow configuration that enhances cooling to a restricted-flow configuration that prevents fire spread, thus resolving the contradiction between cooling efficiency and fire safety
3Strength
If the compression portion is held in strain-loaded position to maintain deflector configuration, then structural integrity is improved, but device complexity deteriorates
Solution Approach 1:
A fuse acts as an intermediary element that connects the compression portion and the support portion. This simple fuse element maintains the strain-loaded position and structural integrity during normal operations, while providing a automatic release mechanism during fire conditions. The fuse simplifies the overall mechanism compared to complex actuators or sensors while maintaining structural integrity
4Extent of automation
If the heat-activated fuse is used to maintain compression position, then automatic fire response is improved, but manufacturing precision requirements deteriorates
Solution Approach 1:
The system uses a simple, inexpensive fuse as the automatic fire response mechanism. The fuse is a consumable element that is replaced after use, eliminating the need for complex, expensive, or highly precise automated systems. This approach achieves automatic fire response while reducing manufacturing precision requirements compared to using sensors, actuators, or electronic control systems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The wind deflector effectively reduces fire damage by redirecting wind and airflow, maintaining system integrity during both normal operations and fire conditions, and preventing the spread of flames and hot gases to the PV array.
Implementation Method 1
a heat-activated fuse maintaining the compression portion in the strain-loaded position
Data Source
AI summary
A rooftop photovoltaic solar system is disclosed. The solar system comprises a plurality of photovoltaic modules forming a rooftop array, the rooftop array having at least one edge and a wind deflector positioned along the edge of the rooftop array, the wind deflector constrained in a first configuration by a fuse. In the first configuration the wind deflector comprises a deflecting portion adapted to deflect wind blowing on the rooftop above the rooftop array and a ventilation portion having a plurality of openings, the openings positioned to permit airflow under the rooftop array. The wind deflector assumes a second configuration upon release of the fuse. In the second configuration, the deflecting portion is elevated from the first configuration and the ventilation portion is positioned to permit less airflow through the plurality of openings than in the first configuration.