Active stairwell compensation systems and methods
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Solution Overview
Problem
Conventional stairwell pressurization systems face challenges in maintaining a consistent positive pressure differential, especially in tall buildings, leading to issues with door accessibility during evacuations and slow response to pressure changes, which can allow smoke to infiltrate the stairwell.
Innovation Solution
An active stairwell compensation system with multiple air injection points, sensors, and adjustable dampers controlled by a system controller to dynamically regulate airflow and pressure, ensuring a positive pressure differential while allowing stairwell doors to open for egress, and quickly responding to changes in pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional stairwell pressurization systems are used, then smoke can be prevented from entering the stairwell, but the system cannot maintain consistent positive pressure differential in tall buildings and responds slowly to pressure changes
Solution Approach 1:
The stairwell is divided into multiple zones with separate air injection points at different elevations, each controlled by its own damper. This segmentation allows independent pressure control in different sections, enabling faster localized response to pressure changes while maintaining overall smoke prevention
Solution Approach 2:
The system uses variable air volume dampers that can dynamically adjust airflow quantities in real-time based on feedback from pressure sensors. This dynamic adjustment capability enables the system to respond quickly to pressure changes while maintaining reliable smoke prevention
2Object-affected harmful factors
If high air pressure is maintained in the stairwell to prevent smoke infiltration, then smoke prevention is improved, but stairwell doors become difficult to open for egress
Solution Approach 1:
Different pressure levels are maintained in different zones of the stairwell based on local conditions. The controller adjusts damper positions to create optimal pressure differentials at each air injection point, ensuring smoke prevention where needed while maintaining door-openability in egress areas
Solution Approach 2:
The system dynamically changes pressure parameters by adjusting damper positions and airflow quantities. This allows the pressure differential to be optimized continuously - high enough to prevent smoke infiltration but low enough to allow door operation for egress
3Stability of the object's composition
If multiple air injection points are used to improve pressure distribution in tall buildings, then pressure consistency is improved, but system complexity increases
Solution Approach 1:
A single controller manages multiple air injection points and dampers, providing centralized coordination that simplifies operation despite the distributed nature of the system. The controller executes pre-programmed logic to adjust all dampers based on feedback from various sensors, maintaining pressure consistency without requiring complex manual coordination
Solution Approach 2:
Pressure sensors at multiple locations provide continuous feedback to the controller, which automatically adjusts damper positions to maintain target pressure differentials. This closed-loop feedback system simplifies the management of multiple air injection points by enabling automatic coordination rather than requiring complex manual control
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 maintains a positive pressure differential in stairwells, preventing smoke infiltration and ensuring door accessibility during emergencies, with rapid adjustments to pressure changes, thereby enhancing occupant safety.
Implementation Method 1
maintain a desirable amount of air pressure at the plurality of air injection points. The desirable amount of air pressure is selected to prevent smoke from entering the stairwell
Implementation Method 2
A respective air injection damper is located between each air injection point and the fan. The controller has programming to utilize data from the plurality of sensors to adjust an amount of air provided by the fan and independently adjust the air injection dampers
Implementation Method 3
At least some of the plurality of sensors are located inside the stairwell, and at least some of the plurality of sensors are located outside the stairwell
Implementation Method 4
The desirable amount of air pressure is selected to prevent smoke from entering the stairwell while allowing stairwell doors to open for egress
Data Source
AI summary
An active stairwell compensation system includes air injection points at different elevations in a stairwell; a fan for providing airflow to the air injection points; sensors; air injection dampers; and a controller in data communication with the fan, the sensors, and the air injection dampers. At least some of the sensors are located inside the stairwell, and at least some of the sensors are located outside the stairwell. A respective air injection damper is located between each air injection point and the fan. The controller has programming to utilize data from the sensors to adjust an amount of air provided by the fan and independently adjust the air injection dampers to maintain a desirable amount of air pressure at the air injection points. The desirable amount of air pressure is selected to prevent smoke from entering the stairwell while allowing stairwell doors to open for egress.