Damper Airflow Measurement Layout for Disturbed Duct Flow
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Solution Overview
Problem
Traditional air flow control systems in ventilation units face challenges in accurately measuring and controlling low air flow velocities and pressure, especially in environments with flow disturbances, requiring significant space for pressure sensors to function effectively.
Innovation Solution
The air flow control unit incorporates multiple measurement areas on both sides of the damper with integrated measurement probes and walls to enhance pressure difference measurement, allowing for more precise control and protection from flow disturbances, and a controller adjusts the damper blade position based on pressure data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional pressure sensors are used to measure air pressure inside the duct, then air flow control is achieved, but measurement precision deteriorates due to insufficient measurement capability for low air flow velocity and sensitivity to flow disturbances
Solution Approach 1:
The measurement function is segmented into multiple measurement areas (first measurement area on inlet side, second measurement area on outlet side) with separate measurement probes. This segmentation allows each probe to measure pressure at specific locations shielded from flow disturbances, improving overall measurement precision and reliability
Solution Approach 2:
Walls are introduced as intermediary structures between the measurement probes and the air flow. The first wall is positioned behind the first measurement point and the second wall is positioned in front of the second measurement point, acting as shields to protect the measurement points from direct exposure to flow disturbances while still allowing pressure measurement
2Reliability
If safety distance is maintained after flow disturbances for sensor placement, then measurement reliability is improved, but device complexity increases due to required space
Solution Approach 1:
The walls serve as intermediary protective structures that enable reliable measurement without requiring large safety distances. By placing the first wall behind the first measurement point and the second wall in front of the second measurement point, the system achieves measurement reliability in compact spaces where traditional sensors would be exposed to flow disturbances
Solution Approach 2:
The measurement points are positioned in three-dimensional space relative to the flow direction and duct geometry. The first measurement point is positioned upstream of the first wall and the second measurement point is positioned downstream of the second wall, creating a spatial arrangement that protects measurements from disturbances while minimizing space requirements
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
This solution enables improved air pressure measurement and control, reducing the need for extensive space and enhancing the accuracy of air flow adjustments, allowing for more compact and efficient ventilation systems.
Implementation Method 1
each measurement area comprises at least one measurement probe having a measurement point for measuring pressure
Implementation Method 2
a first wall behind the first measurement point in air flow direction causing a change in the air flow at the first measurement area
Implementation Method 3
a second wall in front of the second measurement point in air flow direction causing a change in the air flow at the second measurement area
Implementation Method 4
at least one damper blade (11), arranged between the inlet side and the outlet side, configured to rotate about an axis perpendicular to the air flow direction
Data Source
AI summary
An air flow control unit for controlling air flow in a duct, comprising a damper, which is arranged to be installed to the duct, wherein the air flow unit comprises a measurement unit comprising at least two measurement areas so that one measurement area is arranged on different side of the damper in air flow direction than another measurement area, wherein each measurement area comprises at least one measurement probe having a measurement point for measuring pressure, the first measurement area is arranged on the inlet side of the damper, and the first measurement area comprises a first measurement probe having a first measurement point, and a first wall behind the first measurement point in air flow direction causing a change in the air flow at the first measurement area.