Ventilation amount estimation device, ventilation amount estimation method, and program
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Solution Overview
Problem
Existing ventilation amount estimation devices face challenges in accurately estimating ventilation rates in indoor spaces without additional information, such as the number of occupants or external influences, and struggle to minimize errors in carbon dioxide concentration measurements.
Innovation Solution
A ventilation amount estimation device that uses a control unit to collect and analyze carbon dioxide concentration data, estimate outside air concentrations, and calculate candidate ventilation amounts and occupant numbers, then selects the combination with the smallest mean square error to output an estimated ventilation amount as a weighted average, reducing the influence of disturbances like open windows or doors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If carbon dioxide concentration measurement is used to estimate ventilation amount, then ventilation estimation can be performed, but measurement errors and disturbances (open windows, doors) cause estimation inaccuracy
Solution Approach 1:
The system uses feedback by comparing actual carbon dioxide concentration measurements with calculated concentration values to iteratively determine the most accurate ventilation amount estimate. The control unit adjusts estimation based on the difference between measured and calculated values, refining the result through continuous feedback loops.
Solution Approach 2:
The patent applies partial action by using only carbon dioxide concentration data without requiring additional information about occupants, light conditions, or other environmental factors. This selective use of minimal necessary data reduces the impact of disturbances while maintaining estimation accuracy.
2Measurement precision
If additional information (occupant number, light conditions) is used to improve ventilation estimation, then accuracy may improve, but device complexity and information requirements increase
Solution Approach 1:
The system performs self-service by using only the carbon dioxide concentration measurements that are already being taken for other purposes. It derives ventilation amount information from this existing data without requiring additional sensors, occupant counts, or environmental monitoring equipment.
Solution Approach 2:
The patent demonstrates universality by making the ventilation estimation function work with a single type of data (carbon dioxide concentration) that can be obtained in various settings. This multi-functional approach allows the same measurement to serve both occupancy monitoring and ventilation estimation purposes.
Data Source
AI summary
A ventilation amount estimation device estimates a ventilation amount of an indoor target space. The ventilation amount estimation device includes a control unit configured to output, based on a value related to an actual measurement value of a carbon dioxide concentration in the target space and a plurality of calculation results related to a carbon dioxide concentration in the target space calculated with a condition changed, an estimated value of the ventilation amount of the target space from a calculation result corresponding to the actual measurement value of the plurality of calculation results.