HVAC Duct Cleanliness Evaluation Using Non-Invasive PM10 Sensing
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Solution Overview
Problem
Current methods for evaluating the cleaning state of aeration and conditioning plants are invasive, costly, and require plant shutdowns, making it difficult to efficiently assess the need for maintenance and filter replacement, especially for monitoring particulate matter (PM10) within ducts and filters.
Innovation Solution
A non-invasive, portable method using a mathematical model to calculate cleaning indexes based on limited, localized measurements of PM10 concentrations, temperature, and humidity, allowing for the evaluation of duct and filter cleanliness without disrupting plant operation, and providing forecasting for maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If invasive measurement methods are used to evaluate powder concentration inside ducts, then measurement precision is improved, but device complexity and loss of time increase due to expensive interventions and plant shutdowns
Solution Approach 1:
The patent uses air vents as intermediary access points to the duct system. By measuring powder concentration at the air vent opening rather than inside the ducts, the method enables non-invasive evaluation. The air vent serves as a mediator that allows sampling of duct air without requiring physical penetration into the duct system or plant shutdown.
Solution Approach 2:
The patent replaces invasive mechanical measurement systems with optical detection methods. Instead of using physical probes that require insertion into ducts, the system employs optical sensors to detect powder concentration at air vents, substituting mechanical intrusion with optical field-based measurement.
2Measurement precision
If multiple sensors are deployed to evaluate plant cleaning state, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent employs a universal measurement approach where a single sensor system at the air vent performs multiple evaluation functions. The same optical measurement setup assesses both filter efficiency and duct cleaning state, eliminating the need for separate sensor systems for each measurement objective.
Solution Approach 2:
The patent combines multiple measurement objectives into a single measurement location. By evaluating both filter performance and duct cleanliness from powder concentration measurements at the air vent, the method merges what would traditionally require separate measurement systems into one integrated approach.
3Reliability
If frequent measurements are performed to monitor powder accumulation, then reliability is improved, but loss of time and productivity decrease due to repeated plant shutdowns
Solution Approach 1:
The patent enables continuous monitoring of powder concentration at air vents without interrupting plant operation. The non-invasive measurement approach allows the aeration system to remain active while measurements are taken, maintaining continuous air circulation and room pressurization while gathering data for maintenance scheduling.
Solution Approach 2:
The patent performs preliminary assessments of duct cleaning needs through regular non-invasive measurements at air vents. By continuously monitoring powder concentration trends, the system can predict when cleaning will be necessary, allowing maintenance to be scheduled in advance without unexpected plant shutdowns.
Data Source
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AI summary
The present invention places in the field of the maintenance of aeration, conditioning, air-conditioning, etc. plants, and in particular the present invention relates to a method for evaluating the cleaning state of a plant, with particular reference to the atmospheric particulate.