Dual-Outlet Ventilation with Choke Control for Demand-Based Airflow
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Solution Overview
Problem
Existing ventilation systems face challenges in efficiently controlling air supply according to varying occupancy needs, particularly in measuring and managing both large and small air flows, which complicates demand-controlled ventilation.
Innovation Solution
A ventilation device with a controllable choke device and detectors that adjust airflow through multiple outlets based on detected parameters like temperature, humidity, motion, and air quality, allowing for demand-controlled ventilation with reduced complexity and noise, and improved energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If demand-controlled ventilation is implemented using advanced measurement and control technology, then air supply can be optimized according to occupancy needs, but the device complexity increases and small air flows are difficult to measure
Solution Approach 1:
The ventilation system is divided into multiple independent outlets (first outlet and second outlet), each capable of being controlled separately. This segmentation allows the system to handle different air flow requirements independently, simplifying the measurement and control of small air flows at each outlet while maintaining overall optimization capability
Solution Approach 2:
The system changes the operational parameters of the outlets by switching between different modes (first outlet active/second outlet inactive versus first outlet inactive/second outlet active). This parameter switching allows demand-controlled ventilation without requiring complex continuous measurement, as the system can operate in discrete optimized states based on occupancy detection
2Reliability
If continuous ventilation flow is maintained, then air supply reliability is ensured, but energy consumption increases and the system cannot adapt to varying occupancy needs
Solution Approach 1:
The system implements periodic switching between different outlet configurations based on occupancy needs. Rather than maintaining continuous flow at full capacity, the system periodically activates appropriate outlets (first or second) based on detected parameters, ensuring reliable ventilation when needed while reducing energy consumption during low-occupancy periods
Solution Approach 2:
The ventilation system transitions from static continuous operation to dynamic operation where the active outlet configuration changes based on real-time occupancy detection. This dynamic adaptation maintains reliability by ensuring adequate air supply when occupancy is detected while reducing energy consumption when the space is unoccupied
3Productivity
If airflow measurement and control is optimized for large flows, then ventilation capacity is sufficient, but measurement precision deteriorates for small air flows
Solution Approach 1:
By segmenting the ventilation system into multiple outlets with independent control, the system can measure and control air flows at each outlet separately. This segmentation allows optimized measurement for the specific flow range at each outlet, improving precision for small flows while maintaining adequate ventilation capacity through coordinated operation of multiple outlets
Solution Approach 2:
The system uses partial action by activating only the necessary outlet (first or second) based on occupancy levels, rather than operating all outlets at full capacity. This approach provides sufficient ventilation capacity when needed while enabling more precise measurement and control of the actual air flow required, avoiding the measurement challenges of large flows when full capacity is not needed
Data Source
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AI summary
The present invention relates to a ventilation device (1) comprising a first air duct (2) for air supply and a second air duct (3) for air supply. The first air duct (2) comprises a first outlet (4) for air flow and the second air duct (3) comprises a second outlet (5) for air flow, where the first outlet (4) is arranged to admit passage for a predefined amount of air per time unit (F-i). The second outlet (5) comprises a controllable choke device (6) that is arranged to either take a first position that admits passage for a predefined amount of air per time unit (F3) or a second position that does not admit passage of air. The ventilation device (1) comprises a control unit (7) and at least one detector (8, 9), where the control unit (7) is arranged to control the controllable choke device (6) in dependence of input data from said detector (8, 9) such that demand controlled ventilation is obtained.