Device for removing a partial flow from a flowing gaseous medium in a ventilation channel of an air conditioning system
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Solution Overview
Problem
Existing devices for removing a partial flow from a gaseous medium in ventilation ducts suffer from uneven flow distribution through extraction openings, leading to unequal pressure loss and flow rates across different openings.
Innovation Solution
The device incorporates additional extraction chambers with varying cross-sectional areas and strategically placed elements reducing the cross-sectional area, ensuring uniform pressure loss and flow distribution by aligning inlet openings at different heights and using screen-like or diaphragm-shaped closing elements to create differently sized exit areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If inlet openings are provided over the entire length of the removal chamber to enable gaseous medium to flow in over the entire cross section, then the device can sample from the full cross-section, but the flow distribution becomes uneven with largest amount entering closest to detection area
Solution Approach 1:
The patent applies local quality by varying the cross-sectional area of different removal chambers along the flow direction. Each removal chamber has a specifically designed cross-sectional area that compensates for its position in the flow, ensuring uniform flow distribution despite different locations. This resolves the contradiction by making each local region have the specific property needed for its position.
Solution Approach 2:
The patent changes the geometric parameter (cross-sectional area) of removal chambers along the flow direction to achieve uniform flow distribution. By adjusting this physical parameter based on position, the system compensates for natural flow variations and achieves equal flow rates from all chambers into the detection area.
2Adaptability or versatility
If multiple removal openings are arranged at different distances from detection area, then the device can capture flow from different regions, but pressure loss becomes unequal across openings
Solution Approach 1:
The patent applies local quality by designing each removal chamber with a specific cross-sectional area tailored to its position. Removal chambers closer to the detection area have different dimensions than those farther away, with each local configuration optimized to achieve the same pressure loss and flow rate despite different sampling locations.
Solution Approach 2:
The patent achieves equipotentiality in terms of pressure loss by equalizing the flow conditions across all removal chambers. Through careful design of cross-sectional areas, the system ensures that each chamber experiences the same pressure drop and flow rate, creating an equipotential flow distribution despite spatial variations in chamber positions.
3Adaptability or versatility
If removal chambers are positioned at different heights in ventilation duct cross-section, then the device can sample from different vertical positions, but flow rates become unequal due to distance variations
Solution Approach 1:
The patent applies local quality by positioning removal chambers at different heights in the vertical cross-section and assigning each a specific cross-sectional area appropriate to its location. This ensures that each vertical position contributes equally to the sampling, with local geometric adjustments compensating for distance variations from the detection area.
Solution Approach 2:
The patent uses another dimension (vertical height) for sampling distribution while compensating in a different dimension (cross-sectional area). By varying the cross-sectional area parameter to compensate for vertical position variations, the system achieves uniform flow rates across multiple spatial dimensions.
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 configuration ensures that the same amount of air flows into each extraction chamber, maintaining uniform pressure loss and flow distribution, even as the distance between extraction openings increases, thereby optimizing the flow rate and reducing pressure loss across all extraction points.
Implementation Method 1
the pressure loss is the same in all extraction chambers, so that the same amount of air can flow into the detection area via each extraction chamber
Data Source
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AI summary
The invention relates to a device for removing a partial flow from a gaseous medium flowing in a ventilation duct of a ventilation and air-conditioning system, the device comprising on the one hand a detection area, preferably arranged outside of the ventilation duct, and on the other hand a measuring tube which is located between opposite wall areas of the ventilation duct in the ventilation duct and is aligned orthogonally to the direction of flow of the flowing medium, with a removal chamber extending in the longitudinal direction of the measuring tube being provided in the measuring tube, which comprises at least one inlet opening for the gaseous medium to enter the ventilation duct from the ventilation duct into the removal chamber. In order to specify a device that enables the gaseous medium to flow in as uniformly as possible via all extraction openings provided in the measuring tube, at least one additional extraction chamber, in particular arranged in the measuring tube, should be provided, which also has at least one inlet opening through which the flow occurs, the inlet openings being in different extraction chambers are arranged at a different height of the ventilation duct cross-section and wherein all extraction chambers open into the same detection area, and further wherein either the extraction chambers have cross-sectional areas of different sizes, at least along the flow, or the extraction chambers have cross-sectional areas of the same size and at least in each additional one, over the first extraction chamber extending beyond the extraction chamber, preferably in each extraction chamber, along which flow at least one point an element reducing the cross-sectional area is provided, so that free cross-sectional areas of different sizes remain in all removal chambers or the removal chambers have cross-sectional areas of the same size and, at least viewed in the direction of flow, behind each additional removal chamber extending beyond the first removal chamber, an element that reduces the cross-sectional area is provided, which is designed as a screen-shaped closing element , so that different sized free exit cross-sectional areas result for all extraction chambers.