Ventilation Switching Device for Dynamic Room-Level Air Distribution
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Solution Overview
Problem
Ventilation systems lack the ability to dynamically switch between supplying fresh air and extracting stale air based on specific room needs, leading to inefficient air distribution and mass flow balancing.
Innovation Solution
A switching device with separate chambers for fresh air supply and exhaust air discharge, connected via switching valves that allow individual rooms to be connected to either supply or exhaust air, with adjustable and continuously controllable mass flow regulation using mass flow sensors and driven hollow tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the direction of air flow is fixed in an unchangeable manner, then the ventilation system structure is simple, but the system cannot adapt to different room requirements and seasonal conditions
Solution Approach 1:
The ventilation system is divided into multiple independent control zones, with each room equipped with its own switching valve (7.1-7.4) that can independently select between supply air and exhaust air modes. This segmentation allows each room to be controlled individually while maintaining overall system simplicity.
Solution Approach 2:
The system incorporates dynamically adjustable switching valves that can change the air flow direction in each room based on occupancy and air quality requirements. The valves transition between fixed positions and dynamic control, enabling adaptation to different conditions without complex centralized control.
2Adaptability or versatility
If switching valves are added to allow individual room control, then the system becomes adaptable to different room requirements, but the device complexity increases
Solution Approach 1:
The control function is segmented and distributed to individual rooms through separate switching valves (7.1-7.4), each managing only its local room's air flow direction. This distributes complexity across multiple simple components rather than requiring one complex centralized control system.
Solution Approach 2:
Each room's switching valve can be independently operated based on local conditions (occupancy, air quality), making the system self-regulating at the room level without requiring complex inter-room coordination or centralized control logic.
3Productivity
If mass flow sensors and continuous control are implemented, then the mass flow balancing is optimized, but the system complexity and cost increase
Solution Approach 1:
Mass flow sensors are integrated into the connection lines to provide feedback on actual air flow conditions. This feedback enables continuous adjustment of the switching valves to optimize mass flow balancing, ensuring efficient air distribution while maintaining simple valve mechanisms.
Solution Approach 2:
The system continuously adjusts the position of the switching valves based on real-time mass flow measurements, dynamically changing the air flow parameters to optimize distribution efficiency. This maintains simple mechanical valve structures while achieving sophisticated flow optimization through parameter adjustment.
Data Source
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AI summary
In a switching device (1) for a ventilation system with a fresh air supply (2) and an exhaust air discharge (3) as well as several connecting lines (6.1, 6.2, 6.3, 6.4), the fresh air supply (2) opens into a first chamber (4) and the exhaust air discharge (3) into a second chamber (5). Each connection line (6.1, 6.2, 6.3, 6.4) is connected to a switching valve (7.1, 7.2, 7.3, 7.4). The switching valves (7.1, 7.2, 7.3, 7.4) connect the connection lines (6.1, 6.2, 6.3, 6.4) either to the first chamber (4) or to the second chamber (5).