Ventilation Duct Self-Diagnosis for Permeability and Airflow Faults
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Solution Overview
Problem
Conventional ventilation system installation methods face challenges in accurately diagnosing duct permeability and airflow distribution due to bulky measuring devices, restricted access, and the need for specialized labor, leading to potential damage and increased costs.
Innovation Solution
A diagnostic method that uses a control unit and integrated measuring devices to measure airflow at each duct's inlet or outlet, determine pressure drops, and calculate duct leak rates, allowing for precise identification of sealing defects and fault detection without external devices or specialized labor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate measuring devices are used to check duct permeability, then measurement capability is improved, but device complexity and cost increase
Solution Approach 1:
The existing ventilation assembly components (fan, control unit) are made to serve dual purposes: the fan performs both ventilation and creates pressure for measurement, while the control unit manages both ventilation control and measurement coordination. This eliminates the need for separate dedicated measuring devices while maintaining measurement capability.
Solution Approach 2:
The ventilation assembly itself provides the measurement function through its existing components. The system uses its own fan and control unit to perform permeability measurements without requiring external specialized equipment, making the system self-diagnostic.
2Measurement precision
If bulky measuring devices are used, then measurement capability is improved, but ease of operation deteriorates due to restricted access
Solution Approach 1:
The measurement process is segmented into discrete steps (closing outlet, activating fan at determined pressure, measuring airflow, calculating leak rate) that can be performed sequentially using compact components, avoiding the need for large bulky devices that cannot access restricted spaces.
Solution Approach 2:
The patent replaces bulky mechanical measuring devices with an electronic control system that coordinates the fan and measures airflow using integrated sensors, allowing measurements in restricted spaces where mechanical devices cannot physically access.
3Measurement precision
If specialized labor is used for duct permeability measurement, then measurement accuracy is improved, but productivity deteriorates due to temporary dismantling requirements
Solution Approach 1:
The ventilation assembly performs self-diagnosis through integrated sensors and control unit that automatically coordinate the measurement process, eliminating the need for specialized operators to temporarily dismantle ducts for measurement.
Solution Approach 2:
The control unit receives feedback from airflow sensors and automatically adjusts fan operation to determined pressures, then calculates leak rates based on measured airflow data, providing automated measurement without requiring specialized manual intervention or duct dismantling.
4Measurement precision
If repeated manipulations are performed on ducts, then measurement capability is improved, but reliability deteriorates due to drop in initial performance
Solution Approach 1:
The system performs measurement by closing the outlet and activating the fan before any potential damage can occur, allowing permeability assessment without repeated manipulations or dismantling that would compromise duct integrity and initial performance.
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
Enables precise diagnosis of duct permeability and airflow issues, reducing the risk of damage and costs, and allowing for independent testing of each duct within the ventilation assembly.
Implementation Method 1
put the fan into operation at a determined operating pressure
Implementation Method 2
provide at least one measuring device designed to measure the air flow at the inlet or outlet of the damper in each duct
Implementation Method 3
determine the pressure drop Actual Damper Pressure... Determine the actual duct pressure by subtracting the actual damper pressure drop from the determined operating pressure
Data Source
AI summary
The invention relates to a method for diagnosing a single-flow or double-flow ventilation system (1), the method in particular allowing the diagnosis of the permeability and placement of each duct (4) of the ventilation system (1) via measuring devices (5') and a control unit (3).