Kitchen Air Extraction Control for Variable Cooking Loads
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Solution Overview
Problem
Existing air extraction systems in commercial kitchens are inefficient in managing air-borne particles, heat, smoke, and carbon dioxide, often consuming excessive energy and generating noise, especially since they operate at constant pressure or full power regardless of cooking activity levels.
Innovation Solution
A system that adjusts air extraction intensity based on cooking activity levels using a filter chamber, sensors (heat, smoke, CO2), and a signal processing system to control a pumping mechanism, maintaining constant pressure with variable air volume, and includes an air supply mechanism to balance extraction and supply, using eddy current or UV filters and Belimo motors for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pump operates at constant high intensity to ensure adequate air extraction during cooking, then air extraction reliability is improved, but energy consumption increases
Solution Approach 1:
The pump operates with variable speed rather than constant speed, adjusting its intensity dynamically based on detected cooking activity levels. The controller modulates pump speed between low and high intensities to match actual extraction needs, ensuring reliability during cooking while reducing energy consumption during non-cooking periods.
Solution Approach 2:
The system uses sensors (heat, smoke, CO2 detectors) to continuously monitor cooking activity and provides feedback to the controller, which adjusts pump operation accordingly. This closed-loop feedback mechanism ensures the pump operates at appropriate intensity levels based on real-time conditions, balancing reliability and energy efficiency.
2Reliability
If the pump operates at full power to extract air-borne waste products effectively, then air extraction effectiveness is improved, but noise generation increases
Solution Approach 1:
The pump speed is dynamically adjusted based on cooking activity detection. During non-cooking periods, the pump operates at low intensity or remains off, significantly reducing noise. During cooking activities, the pump increases to high intensity to maintain effective air extraction, thus managing noise while preserving effectiveness.
Solution Approach 2:
The pump operates periodically rather than continuously, activating only when cooking activity is detected and deactivating when no cooking is present. This periodic operation reduces overall noise exposure while maintaining extraction effectiveness during necessary periods.
3Use of energy by moving object
If the system operates at constant pressure with variable air volume, then energy efficiency is improved, but system complexity increases
Solution Approach 1:
The system incorporates multiple sensors (heat detectors, smoke detectors, CO2 sensors) that provide feedback to a controller, which adjusts pump operation to maintain constant pressure while varying air volume based on cooking activity. This feedback mechanism enables energy-efficient constant pressure operation without requiring complex variable speed drives.
Solution Approach 2:
The system changes operating parameters (air volume, pump speed) while maintaining constant pressure. By detecting cooking activity levels and adjusting air volume accordingly, the system achieves energy efficiency through parameter optimization without requiring overly complex control mechanisms.
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 reduces energy consumption and noise by matching air extraction rates with cooking activity, ensuring efficient removal of pollutants while minimizing energy use during non-cooking periods and maximizing extraction during cooking, thus providing a more energy-efficient and flexible solution.
Implementation Method 1
The filter chamber may be an eddy current filter. Eddy current filters can remove over 50% of fatty particles of 5μm or more in diameter from the incident exhaust air.
Implementation Method 2
The filter chamber may be an ultra-violet light filter.
Data Source
AI summary
A system for extracting air from a vicinity comprising a filter chamber, a means for determining the level of cooking activity, a signal processing means and a pumping means, wherein the means for determining the level of cooking activity feeds information to the signal processing means in order to control the pumping means.