Passive Microwave Fire Detection for Aircraft Terminal Glass Protection
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Solution Overview
Problem
Existing exterior fire suppression systems for structures like aircraft terminals and hotels with large glass curtain walls are inadequate, as they often suffer from false alarms, limited detection capabilities, and inefficiencies in water usage, particularly in detecting incipient fires and providing timely protection against external fire threats.
Innovation Solution
An exterior fire suppression system incorporating passive microwave radiation detection and a water sprinkler system that can be activated to protect windows and structural elements from external fires, using directional passive microwave antenna arrays and a deluge valve system to efficiently distribute water, while minimizing water consumption and reducing false alarms through intelligent processing of environmental data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional exterior fire suppression systems are used, then fire protection is provided, but water consumption is excessive and false alarms occur frequently
Solution Approach 1:
The system performs preliminary detection using passive microwave radiation sensors to identify incipient fires before they require full suppression activation. This early detection allows the system to prepare for potential fire events while avoiding premature water discharge, thereby reducing false alarms and unnecessary water consumption.
Solution Approach 2:
The system monitors changes in microwave radiation parameters to detect fire development stages. By tracking parameter changes over time rather than using fixed threshold alarms, the system can distinguish between normal thermal variations and actual fire events, reducing false alarms while maintaining accurate fire detection.
2Measurement precision
If traditional detection systems are used, then fire detection is provided, but detection precision for incipient fires is insufficient
Solution Approach 1:
The system replaces traditional mechanical or optical detection mechanisms with passive microwave radiation detection. Microwave radiation can penetrate smoke and detect thermal signatures of incipient fires that other systems miss, providing superior detection precision without requiring complex mechanical moving parts or optical alignment systems.
Solution Approach 2:
The passive microwave detection system serves multiple functions: detecting incipient fires, tracking fire development, and providing early warning. This multi-functionality achieves high detection precision across different fire stages without proportionally increasing system complexity, as the same sensor platform handles all detection tasks.
3Speed
If exterior fire suppression systems are installed, then protection from external fires is provided, but response time is delayed
Solution Approach 1:
The system is pre-positioned and pre-configured at the exterior of structures, allowing immediate response to detected fires without requiring activation sequences or coordination delays. The passive microwave sensors continuously monitor and can trigger suppression systems instantaneously upon fire detection, achieving rapid response speed.
Solution Approach 2:
The system merges detection and suppression functions into an integrated exterior fire protection system. By combining passive microwave detection with exterior sprinkler or water curtain systems in a unified architecture, the system eliminates communication delays between separate detection and suppression systems, achieving faster overall response time.
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 system effectively detects and responds to external fires, reducing the risk to occupants and property by providing timely and targeted water application, while minimizing water usage and false alarm triggers, thus enhancing fire safety and protection for structures with large glass surfaces.
Implementation Method 1
passive microwave radiation reception
Implementation Method 2
providing timely and targeted water application
Data Source
AI summary
An automatic fire suppression system used to provide protection of window glass and other structural elements in aircraft terminals which are exposed to exterior fires caused by natural, accidental, or intentional events comprises a directional passive microwave receiver, a central processor for processing received microwave signals over time and comparing the received signals over time with thermal event signatures stored in memory to selectively actuate a sprinkler system for protecting the window glass in the vicinity of an identified fire event. The memory may further store a model of the aircraft terminal, and the processor utilizes a fire dynamics simulator to simulate a thermal event at the terminal. A related fire suppression process involves the detection of incipient fires through an array of exterior passive microwave heat sensor fire detectors connected to an electronic control processor which identify zones such as 30 to 100 linear foot zones of exterior glass surface and automatically initiates an array of quenching sprinkler heads applying water to the exposed surfaces of glass and other structural elements in response to detection of an identified fire event by its signature.