Biosafety Cabinet Divided Plenum Design for Independent Filter Airflow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional biosafety cabinets with a single blower and plenum face inefficiencies due to the need to operate the blower at higher speeds to overcome the pressure drop of both the supply and exhaust filters, leading to increased power consumption, noise, and reduced filter lifespan.
Innovation Solution
A biosafety cabinet with a divided plenum that separates airflow into independent supply and exhaust passageways, allowing a single blower to supply air to both sections. This configuration enables the blower to operate at a lower speed, with airflow through each filter independent of the other, reducing power consumption and noise while extending filter life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single blower supplies air to both supply and exhaust filters through a single plenum, then the device complexity is reduced, but the blower must operate at higher speed leading to increased power consumption
Solution Approach 1:
The plenum is divided into two separate plenums (supply plenum and exhaust plenum), which segment the airflow paths. This allows the single blower to operate at lower speed while still supplying both filters independently, resolving the contradiction between device simplicity and energy consumption.
Solution Approach 2:
A divider is introduced as an intermediary element within the plenum to separate the airflow into distinct supply and exhaust paths. This mediator enables independent airflow control to each filter, reducing the pressure requirements on the blower and thus lowering power consumption while maintaining a single-blower configuration.
2Reliability
If a single blower pressurizes a single plenum to overcome the highest pressure drop filter, then both filters can be supplied, but the blower operates at higher speed causing increased noise
Solution Approach 1:
By segmenting the plenum into separate supply and exhaust sections, each filter receives dedicated airflow pressure. The blower only needs to overcome the pressure drop of individual filters rather than the combined or maximum of both, significantly reducing operating speed and noise generation while ensuring reliable airflow to both filters.
3Productivity
If the blower operates at higher initial speed to overcome supply filter pressure drop, then sufficient airflow is provided, but the available life span of filters is reduced
Solution Approach 1:
The segmented plenum design allows the blower to operate at lower speed since it only needs to overcome the pressure drop of one filter path at a time rather than the combined resistance. This reduced operating speed decreases the rate at which filters accumulate contaminants, thereby extending filter lifespan while maintaining sufficient airflow productivity.
4Device complexity
If airflow through supply and exhaust filters is dependent on a single plenum pressure, then the system is simpler, but the airflow through each filter is affected by the other's pressure drop
Solution Approach 1:
The plenum is segmented into separate supply and exhaust plenums, providing independent airflow paths to each filter. This segmentation enables independent airflow control for each filter while maintaining relatively simple device architecture, resolving the contradiction between system simplicity and airflow independence.
Solution Approach 2:
The divider acts as an intermediary that separates the airflow within the plenum, allowing independent pressure and flow control to each filter. This mediator enables each filter to operate independently without being affected by the other filter's pressure drop, while still using a single plenum structure.
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
The divided plenum design allows for more efficient operation by reducing the blower speed, lowering power consumption and noise, and extending the lifespan of the filters, while maintaining effective airflow and containment within the biosafety cabinet.
Implementation Method 1
the speed of the blower can be set at a level so that the air within each of the supply section and the exhaust section is at a pressure just above the resistance or pressure drop of the supply filter and the exhaust filter, respectively
Implementation Method 2
An exhaust filter may be positioned within the exhaust passageway between the exhaust inlet and the exhaust outlet. In this manner, air supplied to the exhaust passageway from the blower passes through the exhaust filter. A supply filter may be positioned within the supply passageway between the supply inlet and supply outlet
Data Source
AI summary
A biosafety cabinet including a plenum and a divider positioned in the plenum. The divider divides the plenum into a supply section and an exhaust section. A blower is positioned adjacent the plenum and in fluid communication with the plenum. The blower is configured to simultaneously supply air to both the supply section and the exhaust section of the plenum. An exhaust filter is positioned between the exhaust section and an exhaust outlet. The air supplied to the exhaust section from the blower passes through the exhaust filter. A supply filter is positioned between the supply section and a work area. The air supplied to the supply section from the blower passes through the supply filter. An adjuster may be coupled to the divider to adjust a position of the divider in the plenum.