Multi-Room Air Sampling Using Venturi Vacuum for Low-Energy Monitoring
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Solution Overview
Problem
Existing air monitoring systems for building ventilation face challenges in efficiently and economically sampling and monitoring air quality across multiple rooms, leading to delays and increased maintenance costs due to reliance on active vacuum devices and variable purge times.
Innovation Solution
An air sampling system utilizing a Venturi Vacuum device to generate suction from the existing HVAC system, allowing continuous sampling and monitoring of air quality across multiple rooms with minimal energy consumption and reduced maintenance, by selectively directing air samples to sensors and purging only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If active vacuum devices are used to sample air from multiple rooms, then air sampling can be performed, but energy consumption increases and maintenance costs increase
Solution Approach 1:
The system uses the existing HVAC system's air flow to self-generate the suction needed for air sampling. The Venturi vacuum device creates suction by utilizing the kinetic energy of the HVAC air flow, eliminating the need for separate powered vacuum pumps. This self-service approach reduces both energy consumption and maintenance requirements.
Solution Approach 2:
The invention employs pneumatic principles by using the Venturi effect - a fluid dynamic phenomenon where a constriction in the air flow path creates a pressure difference that generates suction. The HVAC air flow passes through a restricted section of the sampling line, creating negative pressure that draws air samples from multiple rooms without mechanical vacuum devices.
2Productivity
If air samples from multiple rooms are continuously monitored, then real-time air quality data is obtained, but system complexity increases
Solution Approach 1:
The system combines multiple air sampling functions into a single integrated network. Multiple sampling lines from different rooms converge at a common manifold that connects to a single sensor device. This merging approach allows simultaneous monitoring of multiple rooms while using shared infrastructure, reducing overall system complexity.
Solution Approach 2:
The HVAC system serves multiple functions: it provides climate control for the building and simultaneously powers the air sampling system through the Venturi effect. The air flow controller acts as a multi-functional device that can selectively direct air samples from any combination of rooms to the sensor, providing versatile monitoring capability without proportionally increasing complexity.
3Measurement precision
If purge lines are used to clear air samples, then sensor accuracy is maintained, but variable purge times cause delays
Solution Approach 1:
The system continuously flows air samples through the sampling lines even when not currently being measured. This continuous flow preliminary action ensures that the lines are always flushed with fresh air, eliminating the need for time-consuming purge cycles before measurements and maintaining sensor accuracy without delays.
Solution Approach 2:
The air sampling system operates continuously rather than in discrete cycles. Air samples flow continuously through the lines, and the sensor can continuously monitor different rooms by switching which sample line is connected. This continuous operation eliminates idle purge times and maintains measurement readiness at all times.
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 approach enables efficient, real-time monitoring of air quality across multiple rooms with reduced operational costs and maintenance, maintaining a low cycle time and responsive system operation.
Implementation Method 1
An air sampling system utilizing a Venturi Vacuum device to generate suction from the existing HVAC system
Data Source
AI summary
An air sampling system configured to detect an air quality metric for a plurality of volumetric regions is disclosed. The system comprises an air sample return unit, an air flow controller, and at least one sensor. The air sample return unit is configured to independently transfer air from the plurality of regions as a plurality of air samples. The air flow controller is configured to receive each of the plurality of air samples and selectively direct a selected sample to a sensor supply line and the remainder of the samples to a sample purge line. The at least one sensor is configured to measure an air quality metric of the selected sample and communicate the air quality metric to a controller. The remainder of the air samples are directed to the air sample return unit throughout operation.