Building Ventilation Pressure Control Against Radon Infiltration
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Solution Overview
Problem
Buildings are not airtight, leading to energy loss and infiltration of pollutants, including radon, which poses health risks, and existing solutions like sealing or active ventilation are costly and energy-intensive with uncertain results.
Innovation Solution
A method and system to control a building's ventilation system by measuring and adjusting air pressure differences across the building envelope to prevent pollutant infiltration, using sensors and a computerized control system to increase indoor pressure if it's below a predetermined threshold, and adjusting fan speeds or vent openings to maintain a desired pressure difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sealing openings in the building envelope is performed to prevent pollutant infiltration, then pollutant infiltration is reduced, but the cost and complexity of modification increases significantly
Solution Approach 1:
The patent replaces mechanical sealing systems with a pressure control system using fans and vents. Instead of physically sealing the building envelope, the system uses negative pressure generation through fans to prevent pollutant infiltration, thereby avoiding complex building modifications while achieving the same protective effect.
Solution Approach 2:
The patent changes the physical parameter of air pressure within the building envelope by using fans to maintain negative pressure. This parameter change prevents pollutant infiltration without requiring structural modifications to seal openings, thus resolving the contradiction between effectiveness and modification complexity.
2Object-affected harmful factors
If active ventilation is used to replace air frequently to prevent pollutant infiltration, then indoor air quality is improved, but energy consumption increases significantly
Solution Approach 1:
The patent employs feedback control by using sensors to detect pollutant levels and radon concentrations, then adjusting fan operation accordingly. This feedback mechanism allows the system to maintain air quality while minimizing energy consumption by operating fans only when necessary, rather than continuous high-speed ventilation.
Solution Approach 2:
The patent applies partial action by using negative pressure to prevent pollutant infiltration at the source rather than completely replacing all indoor air. This partial approach is sufficient to achieve the goal of preventing harmful infiltration while consuming less energy than full air replacement systems.
3Object-affected harmful factors
If pipes and fans are installed to create alternative path for ground gases, then radon infiltration is prevented, but device complexity and installation cost increase
Solution Approach 1:
The patent makes the ventilation system multi-functional by using the same fans and pressure control mechanism to handle both general pollutant infiltration and radon prevention. Instead of installing separate dedicated radon mitigation systems with pipes, the system achieves radon prevention through overall negative pressure control, thereby reducing device complexity.
Solution Approach 2:
The patent extracts the radon mitigation function from the complex pipe system and integrates it into the general ventilation system. By using negative pressure to prevent radon entry at the building envelope level rather than installing separate sub-floor pipe systems, the solution simplifies the overall device complexity while maintaining effectiveness.
4Object-affected harmful factors
If higher air pressure difference is maintained to prevent pollutant infiltration, then infiltration is reduced, but energy loss from air leakage increases
Solution Approach 1:
The patent applies partial action by maintaining just enough negative pressure to prevent pollutant infiltration rather than using excessive pressure differences. This minimal sufficient approach prevents harmful infiltration while minimizing energy loss from air leakage through the building envelope.
Solution Approach 2:
The patent uses feedback control to dynamically adjust the pressure difference based on actual pollutant levels and environmental conditions. This allows the system to maintain only the necessary pressure difference to prevent infiltration, reducing energy loss compared to continuous high-pressure-difference operation.
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
Effectively reduces pollutant infiltration and energy loss by maintaining a controlled air pressure difference, enhancing indoor air quality and reducing the risk of radon accumulation while minimizing energy consumption.
Implementation Method 1
obtaining a measurement of a current difference in air pressure on respective sides of a building envelope and if the air pressure on the inside of the building envelope is not at least a predetermined threshold for air pressure difference higher than the air pressure on the outside of the building envelope
Data Source
AI summary
Methods and systems for controlling ventilation in a building based on measurements of air pressure differences between inside and outside of the building envelope in order to prevent infiltration of pollutants in general. The system is particularly suited to prevent infiltration of radon from the ground. Air pressure is measured on both sides of the building envelope and the building's ventilation system is controlled in order to ensure that the air pressure inside the envelope is at least a minimum threshold higher than the air pressure on the outside of the building envelope.