Supply and exhaust ventilation device
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Solution Overview
Problem
Conventional supply and exhaust ventilation devices experience high annual power consumption due to increased internal pressure loss during heat exchange ventilation, especially when the heat exchange element is used for extended periods.
Innovation Solution
A ventilation device with a main body featuring separate air supply and exhaust paths, a heat exchange element at their crossover, and a damper system controlled by temperature sensors to switch between heat exchange and normal ventilation modes, reducing power consumption by minimizing internal pressure loss when comfortable temperature ranges are maintained.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If heat exchange ventilation is performed using a heat exchange element, then heat recovery efficiency is improved, but internal pressure loss increases and power consumption increases
Solution Approach 1:
The system dynamically switches between heat exchange ventilation mode and normal ventilation mode based on real-time temperature sensor feedback. When the temperature difference between indoor and outdoor air exceeds a predetermined threshold, the system activates heat exchange ventilation; otherwise, it switches to normal ventilation, thereby adaptively optimizing power consumption while maintaining heat recovery efficiency when needed.
Solution Approach 2:
The control unit changes the operational parameters of the ventilation system by switching between different ventilation modes based on temperature conditions. This parameter change (mode switching) allows the system to optimize the balance between heat recovery efficiency and power consumption according to environmental conditions.
2Loss of energy
If heat exchange ventilation is performed for extended periods, then heat recovery efficiency is maintained, but annual power consumption becomes high
Solution Approach 1:
The system implements periodic assessment of temperature conditions to determine whether to activate heat exchange ventilation. By periodically checking temperature differences and switching modes accordingly, the system avoids continuous operation of the heat exchange element, thereby reducing annual power consumption while maintaining heat recovery efficiency during periods when it is actually beneficial.
3Use of energy by moving object
If the damper switches between heat exchange exhaust air path and normal ventilation air path, then power consumption is reduced, but system complexity increases
Solution Approach 1:
The system extracts the temperature sensing and control functions into a separate control unit that independently manages the damper positioning. This extraction simplifies the overall system architecture by separating the control logic from the ventilation execution components, making the system easier to manage despite the added functionality.
Solution Approach 2:
The system employs feedback control where temperature sensors continuously monitor indoor and outdoor temperatures, and the control unit uses this feedback to automatically adjust damper positions. This feedback mechanism enables automatic optimization of power consumption without requiring complex manual intervention or oversight.
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 effectively reduces power consumption by switching to normal ventilation when indoor and outdoor temperatures are within comfortable ranges, minimizing discomfort and energy usage while maintaining airflow volumes.
Implementation Method 1
a heat exchange element which is disposed on a crossover part of the supply air path and the exhaust air path and exchanges heat of the outdoor air and heat of the indoor air
Data Source
AI summary
In order to efficiently exchange indoor air and outdoor air, to reduce power consumption, and to reduce discomfort to a user, damper, which switches between a heat exchange exhaust air path and a normal ventilation air path, is provided in an exhaust air path. In addition, a discomfort index is calculated from detection results of indoor temperature sensor provided on indoor-side inlet and outdoor temperature sensor provided on outdoor-side inlet. Further, controller, which switches between the heat exchange exhaust air path and the normal ventilation air path so as not to cause discomfort to the user, is provided to control damper.