Fume Cupboard Airflow Control via Power Threshold Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fume cupboards consume large volumes of tempered air when not in use, leading to increased heating and cooling costs and environmental impact due to inefficient power consumption and ventilation.
Innovation Solution
A method and apparatus for a fume cupboard that includes an electrical power measuring unit to determine if power consumption is below a threshold, a VOC sensor, temperature sensor, and presence detectors to ensure no work is being performed before deactivating the unit, reducing airflow to a minimum when no work is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fume cupboard operates with continuous high airflow to ensure safety and containment, then contaminant capture and operator protection are maintained, but energy consumption and heating/cooling costs increase significantly
Solution Approach 1:
The patent applies dynamics by transitioning the fume cupboard from static continuous operation to dynamic variable operation. The system automatically adjusts airflow based on detected work activity: maintaining high airflow during work to ensure contaminant capture, and reducing to minimum airflow during idle periods to conserve energy. This dynamic adaptation resolves the contradiction between maintaining reliability and reducing energy consumption.
Solution Approach 2:
The patent implements feedback through sensors that continuously monitor work conditions (presence detection, power consumption, VOC levels, temperature) and feed this information back to the control system. Based on this feedback, the system automatically adjusts airflow rates - maintaining high flow when work is detected and reducing flow when idle. This closed-loop feedback mechanism enables the system to maintain safety while optimizing energy consumption.
2Loss of energy
If the fume cupboard is deactivated to reduce energy consumption during idle periods, then heating and cooling costs decrease, but safety and contaminant containment may be compromised
Solution Approach 1:
The patent applies partial action by providing different levels of airflow based on operational needs. Instead of complete shutdown, the system provides minimum necessary airflow during idle periods to maintain basic containment and safety, while reducing overall energy consumption. This partial operation resolves the contradiction by maintaining essential safety functions while eliminating excessive energy waste.
Solution Approach 2:
The patent changes the airflow parameter dynamically based on detected work conditions. During work, high airflow parameters ensure safety and containment. During idle periods, the system changes to minimum airflow parameters that maintain basic safety while reducing energy consumption. This parameter adjustment resolves the contradiction between energy conservation and safety maintenance.
3Measurement precision
If multiple sensors and monitoring systems are added to detect work conditions accurately, then automatic deactivation accuracy improves, but device complexity increases
Solution Approach 1:
The patent merges multiple detection functions into a unified control system. Sensors detecting presence, power consumption, VOC levels, and temperature are integrated and evaluated together by a single control unit that makes deactivation decisions based on the combined information. This merging approach improves measurement precision through multiple indicators while managing device complexity through centralized control logic.
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A process (100) for deactivating a fume cupboard (10) is provided. The fume cupboard comprises an open front section (15) which is closable by means of a front sash (17), a work chamber (13) enclosed by side sections (16), a bottom section (18), a back side section (14), and a top section (20) provided with an exhaust opening (22). The fume cupboard further comprises an electrical power measuring unit (44) configured to measure electrical power consumption of the fume cupboard. The process comprises the steps of determining (102), by means of the electrical power measuring unit, if an electrical power consumption of the fume cupboard fulfills a predetermined threshold condition; if so, closing (201) the front sash of the fume cupboard; switching (203) an electrical power for the fume cupboard off; and controlling (204) an air flow through the fume cupboard to a minimum flow.