Ventilation apparatus and ventilation control method
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Solution Overview
Problem
Conventional ventilation systems fail to accurately control ventilation based on CO2 concentrations in indoor spaces due to neglecting outdoor CO2 levels, leading to excessive ventilation when outdoor CO2 concentrations are high, even during low human activity periods.
Innovation Solution
A ventilation system that calculates a threshold based on outdoor CO2 concentrations and adjusts ventilation air volume accordingly, using CO2 sensors to monitor both indoor and outdoor CO2 levels, allowing for adaptive control of ventilation to match human activity levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ventilation air volume is increased to maintain low CO2 concentration in the room, then indoor air quality is improved, but energy consumption increases due to excessive ventilation when outdoor CO2 concentration is high
Solution Approach 1:
The ventilation system dynamically adjusts the ventilation air volume based on real-time CO2 concentration measurements from both indoor and outdoor sensors. The control unit continuously monitors the difference between indoor and outdoor CO2 levels and modulates the ventilation blower speed accordingly, transitioning from fixed to variable ventilation rates to match actual contamination needs
Solution Approach 2:
The system implements a feedback control mechanism where indoor and outdoor CO2 sensors provide continuous information to the control unit. The control unit processes this feedback by calculating the CO2 concentration difference and adjusts the ventilation air volume in response, creating a closed-loop control system that automatically responds to changing environmental conditions
2Ease of operation
If ventilation air volume is fixed according to design specifications, then installation and operation are simplified, but the system cannot adapt to varying human activity levels and outdoor CO2 conditions
Solution Approach 1:
The ventilation system performs self-adjustment by automatically monitoring indoor and outdoor CO2 concentrations and regulating its own ventilation air volume through the control unit and variable speed blower. This eliminates the need for manual intervention or complex user programming while maintaining adaptability to changing occupancy and environmental conditions
Solution Approach 2:
The system transitions from a static fixed ventilation design to a dynamic adaptive system that automatically adjusts ventilation rates based on real-time sensor data. The variable speed blower and control algorithm enable the system to respond flexibly to varying human activity levels without requiring complex user interaction
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 ensures optimal ventilation control, reducing energy consumption and maintaining comfortable indoor air quality by aligning ventilation rates with both outdoor CO2 levels and human activity, thereby improving energy efficiency and indoor air quality.
Implementation Method 1
a first CO2 sensor (14a) that detects CO2 concentration in exhaust air
Data Source
Figure 1
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AI summary
To provide a ventilation apparatus capable of controlling an amount of ventilation according to an amount of human activity in a room even when CO2 concentration in outdoor air changes. The ventilation apparatus includes: a ventilation unit 170 that exchanges air in an indoor space 27 and air in an outdoor space, which is a space different from the indoor space 27, and ventilates the indoor space 27; a calculation unit 112 that calculates a threshold T on the basis of CO2 concentration Coa of the air in the outdoor space and a selected operation mode selected in advance from a plurality of operation modes; and an operation control unit 113 that controls the ventilation unit 170 such that the amount of ventilation is larger when the CO2 concentration of the air in the indoor space 27 is higher than or equal to the threshold T than when CO2 concentration Cra of the air in the indoor space 27 is lower than the threshold T.