Method for measuring pressure differences between different premises in a building
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Solution Overview
Problem
Existing methods for measuring pressure differences in buildings, such as two-port pressure difference meters and absolute pressure sensors, face challenges including inconvenient installation, maintenance requirements, and high accuracy demands, leading to instability and errors due to the dynamic nature of air pressure.
Innovation Solution
A method that uses absolute pressure sensors to mathematically separate the pressure difference caused by ventilation from the measurement results by incorporating information on ventilation efficiency, allowing for accurate control of the ventilation process and reducing installation costs through adaptive measurement strategies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two-port pressure difference meters are used to measure pressure differences between premises, then measurement can be performed, but installation becomes inconvenient and difficult in existing buildings
Solution Approach 1:
The measurement system is segmented into multiple independent absolute pressure sensors placed at different locations (inside and outside the building), replacing the single integrated two-port pressure difference meter. This segmentation allows flexible installation in existing buildings without requiring complex routing of pressure channels through the building structure.
Solution Approach 2:
The patent introduces an intermediary computational process that processes measurements from multiple absolute pressure sensors to derive pressure difference information. Instead of directly measuring pressure difference through physical channels, the system uses intermediate absolute pressure measurements combined with ventilation efficiency data to calculate the effective pressure difference, eliminating the need for complex physical installation.
2Measurement precision
If two measuring elements measuring absolute pressure are used to determine pressure difference by subtraction, then measurement can be performed, but long-term instability and high accuracy requirements cause errors
Solution Approach 1:
The system incorporates feedback by continuously monitoring ventilation efficiency and using this information to correct and adjust the pressure difference calculations. The control unit uses real-time ventilation efficiency data to compensate for changes in the building's pressure field, maintaining measurement reliability even as environmental conditions change over time.
Solution Approach 2:
The patent changes the measurement parameters from direct pressure difference to a combination of absolute pressure measurements and ventilation efficiency metrics. By measuring and utilizing ventilation efficiency as an additional parameter, the system can distinguish between pressure changes caused by ventilation and those caused by other factors, improving long-term measurement stability and reliability.
3Measurement precision
If high measuring accuracy of 1 Pa is required, then precise pressure difference measurement is achieved, but the complexity and costs increase significantly
Solution Approach 1:
The system achieves multi-functionality by using the same absolute pressure sensors for multiple purposes: measuring both absolute pressure values and, in combination with ventilation efficiency data, deriving pressure difference information. This universal approach eliminates the need for specialized high-precision pressure difference sensors, reducing system complexity and cost while maintaining the required 1 Pa measurement accuracy.
4Measurement precision
If pressure channels are installed for two-port pressure difference meters, then pressure measurement is enabled, but regular maintenance is required
Solution Approach 1:
The patent replaces the mechanical pressure channel system with electronic sensing and computational processing. Instead of using physical hoses and ducts to transport air pressure to the measuring element, the system uses absolute pressure sensors that directly measure pressure at their locations, with results processed computationally. This substitution eliminates the mechanical pressure channels that would require regular maintenance for leaks, blockages, and calibration.
Data Source
AI summary
A method for measuring pressure differences in different premises of a building, in which the pressure difference is measured using one or more sensors (2) that measure absolute pressure. The measurement results obtained from the sensors (2) are combined with information on the efficiency of the ventilation of the building, and the pressure difference caused by ventilation is mathematically separated from the measurement result by making use of information on the ventilation efficiency at any one time.