Method and system for assessing metabolic rate and maintaining indoor air quality and efficient ventilation energy use with passive environmental sensors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for assessing metabolic rate under free-living conditions are either invasive, costly, or fail to accurately represent an individual's metabolic activity, particularly in confined environments, and do not efficiently manage indoor air quality to prevent carbon dioxide buildup, which can be detrimental to health.
Innovation Solution
A system using passive sensors to monitor carbon dioxide and set an air change rate in a car cabin or small room, maintaining CO2 levels within a healthy range (600-1000 ppm) while providing an assessment of metabolic rate through changes in air ventilation rate, utilizing a mathematical model to determine individual metabolic rates from CO2 production rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional indirect calorimetry devices are used to assess metabolic rate, then measurement accuracy is improved, but ease of operation deteriorates due to active measurement requirements
Solution Approach 1:
The system enables passive metabolic rate assessment by automatically monitoring CO2 levels in the environment and calculating metabolic rate without requiring the individual to actively perform measurements. The environmental sensors continuously monitor CO2 production, and the processor automatically calculates metabolic rate, eliminating the need for user intervention while maintaining measurement accuracy.
Solution Approach 2:
The patent replaces traditional mechanical indirect calorimetry devices with environmental CO2 sensors and computational algorithms. Instead of using complex metabolic carts or hand-held devices that require active measurement, the system uses environmental CO2 monitoring combined with mathematical models to assess metabolic rate, substituting mechanical measurement systems with sensor-based environmental monitoring.
2Measurement precision
If Doubly Labeled Water Method is used to assess total energy expenditure, then measurement accuracy is improved, but cost and complexity worsen
Solution Approach 1:
The system replaces expensive isotope analysis with affordable environmental CO2 sensors that can be deployed continuously. Instead of using costly Doubly Labeled Water methodology requiring isotope analysis facilities, the patent uses low-cost CO2 sensors combined with computational models to achieve continuous metabolic rate monitoring at a fraction of the cost.
Solution Approach 2:
The patent substitutes the complex isotope analysis infrastructure with environmental sensor networks and computational algorithms. The system replaces the need for specialized isotope analysis equipment and facilities with readily available CO2 sensors and mathematical models, dramatically reducing complexity and cost while maintaining measurement capability.
3Object-affected harmful factors
If ventilation rate is increased to maintain indoor air quality, then indoor air quality is improved, but energy consumption worsens
Solution Approach 1:
The system continuously monitors CO2 levels in the environment and uses this feedback to dynamically adjust ventilation recommendations. The processor analyzes real-time CO2 data and provides personalized ventilation guidance, allowing the system to optimize air quality maintenance while minimizing energy consumption by adjusting ventilation rates based on actual metabolic activity and CO2 production.
Solution Approach 2:
The system enables dynamic adjustment of ventilation strategies based on real-time metabolic rate assessment. Instead of using fixed ventilation rates, the patent allows ventilation recommendations to adapt continuously to changing metabolic activity levels, ensuring adequate air quality when needed while reducing ventilation energy consumption during periods of lower metabolic activity.
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
Enables accurate, non-invasive, and cost-effective assessment of metabolic rate in minimal time, maintaining good indoor air quality and optimizing ventilation energy use, thus preventing health risks associated with high CO2 levels.
Implementation Method 1
a sensor array including at least one sensor of carbon dioxide
Data Source
AI summary
An integrated method for assessing metabolic rate and maintaining indoor air quality and efficient ventilation energy use. A physical sensor assesses room occupancy. An actuated ventilation system is set to a constant CO2 level in a predetermined healthy range, where the actuated ventilation system includes a CO2 sensor. The actuated ventilation system sets a first air ventilation rate and the sensor measures a first CO2 level. The system determines whether CO2 level is in a healthy range, if not then the CO2 level is adjusted by setting a subsequent air ventilation rate. A subsequent CO2 level is measured. If the CO2 level is determined to meet a predetermined healthy range, then an assessment of change of air ventilation rate (Δ ACH) is determined. The determination of air change rate can be further augmented by a physical pressure based measurement. The overall metabolic rate is generated.