Subfloor Vapor Mitigation Blower Control for Stable Vacuum
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Solution Overview
Problem
Existing vapor mitigation systems face inefficiencies due to constant power blower operation, leading to excessive energy consumption and varying vacuum pressures that do not account for changing environmental and building conditions, resulting in inadequate contaminant removal and potential exposure to VOCs and radon in buildings.
Innovation Solution
A dynamically controlled vapor mitigation system with a variable power/speed blower and vacuum controller that adjusts power based on environmental measurements, such as temperature, pressure, and contaminant levels, to maintain a consistent vacuum and optimize airflow, ensuring efficient contaminant removal while adhering to regulatory standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a constant power blower is used in vapor mitigation systems, then the system structure is simple and easy to operate, but energy consumption is excessive and vacuum pressure varies with environmental conditions
Solution Approach 1:
The patent applies dynamics by transitioning from a constant power blower to a variable power blower that dynamically adjusts its operation based on real-time environmental conditions. The system monitors temperature, pressure, and contaminant levels, then modulates blower power accordingly to maintain optimal vacuum levels while minimizing energy consumption. This dynamic adjustment resolves the contradiction by making the system adaptable to changing conditions rather than operating at fixed power levels.
Solution Approach 2:
The patent implements parameter changes by varying the power input to the blower based on measured environmental parameters such as temperature, pressure, and contaminant concentration. The system adjusts operational parameters (power, speed) in response to changing conditions, allowing it to maintain effective vapor mitigation while reducing energy consumption during periods when lower power suffices. This directly addresses the energy consumption issue without requiring complete system redesign.
2Reliability
If a constant power blower is used, then the device is easier to operate, but contaminant removal is inadequate when environmental conditions change
Solution Approach 1:
The patent employs feedback mechanisms by continuously monitoring environmental conditions (temperature, pressure, contaminant levels) and using this information to adjust blower operation. The system measures actual vacuum levels and contaminant removal effectiveness, then feeds this information back to the control system which modifies blower power accordingly. This closed-loop feedback ensures reliable contaminant removal across varying conditions while automating the complexity, making operation easier despite the advanced control capabilities.
Solution Approach 2:
The system implements self-service by automatically adjusting its own operation based on sensor inputs without requiring manual intervention. The controller autonomously monitors environmental conditions and modulates blower power to maintain optimal performance, eliminating the need for operators to manually adjust settings in response to changing conditions. This self-regulating capability maintains reliability while simplifying operation.
3Object-affected harmful factors
If vacuum pressure varies with environmental conditions, then the system is simpler to control, but negative pressures induce vapor intrusion into building spaces
Solution Approach 1:
The patent uses feedback control to maintain a pre-specified pressure differential between the interior of the building and the underlying soil or crawl space. Pressure sensors continuously monitor the vacuum level, and the controller adjusts blower power to maintain the target pressure differential (e.g., two pascals). This automated feedback control prevents vapor intrusion by ensuring the pressure differential remains within safe thresholds, resolving the contradiction between preventing harmful effects and implementing control automation.
Solution Approach 2:
The system applies preliminary anti-action by proactively maintaining a positive pressure differential in the building interior through controlled vacuum application. By anticipating that environmental changes could create negative pressure conditions conducive to vapor intrusion, the system continuously adjusts blower operation to prevent pressure inversion before it occurs. This preventive approach blocks vapor intrusion pathways by maintaining protective pressure conditions.
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 achieves energy efficiency by dynamically adjusting power to maintain optimal vacuum levels, reducing contaminant exposure and energy consumption, while ensuring compliance with regulatory discharge standards through real-time monitoring and control.
Implementation Method 1
a blower constructed and arranged to create a vacuum under the floor of the building
Implementation Method 2
create a vacuum under the floor of the building
Implementation Method 3
maintain a pre-specified pressure differential such as two pascals (0.008′′ w.c.) between the interior of the building and the underlying soil, crawl space or vapor barrier
Data Source
AI summary
A vapor mitigation system includes at least one vacuum pipe configured to collect vapors beneath a floor of a building, and a blower coupled to the at least one vacuum pipe. The blower is configured to create a vacuum under the floor of the building. The vapor mitigation system includes a controller configured to control a speed of the blower. The controller adjusts the speed of the blower in response to a level of vacuum created under the floor of the building.