Indoor environmental quality control device with carbon dioxide concentration control
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Solution Overview
Problem
Indoor spaces face challenges in maintaining optimal carbon dioxide levels, temperature, and humidity, which can affect occupant health and plant growth, with existing technologies failing to provide real-time and precise control, especially in environments like hospitals and greenhouses.
Innovation Solution
An indoor environmental quality control device equipped with carbon dioxide, temperature, and humidity measuring sections, along with a control system that adjusts these parameters based on reference values set through a control panel, including a carbon dioxide supply mechanism, heating/cooling, and humidifying/dehumidifying functions, to maintain predetermined levels and support plant cultivation or indoor air cleaning modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If real-time monitoring and control of carbon dioxide concentration is implemented, then indoor air quality and plant growth conditions are improved, but device complexity and cost increase
Solution Approach 1:
The control system is divided into separate functional modules: a carbon dioxide concentration detection module that monitors CO2 levels, a control module that processes the detected data, and an execution module that adjusts ventilation or carbon dioxide supply based on control instructions. This modular segmentation reduces overall system complexity while maintaining real-time control capability.
Solution Approach 2:
The system implements closed-loop feedback control where the detection module continuously monitors carbon dioxide concentration and feeds this information back to the control module. The control module compares the detected concentration with preset thresholds and automatically adjusts the ventilation system or carbon dioxide supply accordingly, ensuring reliable indoor air quality control without requiring complex manual intervention.
2Productivity
If carbon dioxide concentration is increased for plant photosynthesis, then plant growth and crop yield improve, but excessive carbon dioxide becomes harmful to occupants
Solution Approach 1:
The system applies different carbon dioxide concentration standards to different spatial zones: in plant cultivation areas, higher carbon dioxide concentrations (1000-1500 ppm) are maintained to promote photosynthesis and growth, while in occupied areas, carbon dioxide levels are kept below safety thresholds (typically <1000 ppm) to protect human health. The detection and control modules can be configured with zone-specific parameters to achieve this differentiated quality control.
Solution Approach 2:
The system dynamically adjusts carbon dioxide concentration parameters based on real-time detection data and operational mode. In plant growth mode, the target concentration is set higher (1000-1500 ppm) to optimize photosynthesis, while in occupancy mode, the target is lowered (<1000 ppm) to ensure safety. The control module transitions between these parameter sets based on sensor inputs and preset conditions, allowing the same system to serve dual purposes safely.
3Reliability
If ventilation system is used to control carbon dioxide, then carbon dioxide levels are adjusted, but energy consumption increases
Solution Approach 1:
Instead of maintaining continuous full-capacity ventilation, the system applies partial action by adjusting ventilation intensity based on actual carbon dioxide concentration levels. When CO2 levels are within acceptable ranges, ventilation operates at minimal capacity or remains idle. When CO2 exceeds thresholds, the ventilation system activates at the necessary intensity to restore acceptable levels, then reduces again. This on-demand partial operation maintains reliable CO2 control while significantly reducing energy consumption compared to continuous full-capacity ventilation.
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 device ensures real-time control of indoor environments, enhancing occupant comfort and plant growth by maintaining optimal carbon dioxide, temperature, and humidity levels, thereby improving crop yield and indoor air quality.
Implementation Method 1
a carbon dioxide measuring section 110 for measuring the amount of carbon dioxide in an indoor space
Implementation Method 2
a temperature measuring section 120 for measuring the temperature of the indoor space
Implementation Method 3
a humidity measuring section 130 for measuring the humidity of the indoor space
Implementation Method 4
a carbon dioxide supply device for supplying carbon dioxide into the indoor space according to a control signal
Data Source
AI summary
Provided is an indoor environmental quality control device with a carbon dioxide concentration control, and more particularly an indoor environmental quality control device that is set up in indoor spaces requiring a control of carbon dioxide concentration to provide comfort indoor environments by adjusting the concentration of carbon dioxide to be acceptable for each indoor space and offering temperature and humidity controls.