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 selecting the appropriate ventilation path based on indoor and outdoor temperature ranges to prevent discomfort and optimize energy use.
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 readings. When the temperature difference between indoor and outdoor air exceeds a predetermined threshold, the system activates heat exchange ventilation; otherwise, it uses normal ventilation, thereby adapting to varying environmental conditions to optimize energy efficiency.
Solution Approach 2:
The control unit monitors temperature parameters and changes the ventilation mode based on temperature difference thresholds. By comparing the temperature difference against a predetermined value, the system adjusts its operation to either utilize heat exchange or bypass it, optimizing power consumption based on environmental parameters.
2Loss of energy
If heat exchange ventilation is performed for extended periods, then heat recovery efficiency is improved, but annual power consumption becomes high
Solution Approach 1:
The system periodically evaluates the temperature difference between indoor and outdoor air and switches between heat exchange ventilation and normal ventilation modes. This periodic assessment prevents continuous operation of the heat exchange system, reducing cumulative power consumption while maintaining heat recovery efficiency when conditions warrant it.
Solution Approach 2:
The control unit changes operational parameters by switching ventilation modes based on temperature conditions. When temperature differences are small, the system transitions to normal ventilation mode, thereby reducing annual power consumption while preserving the capability for efficient heat recovery when temperature differences are large.
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 user comfort may be affected
Solution Approach 1:
The control unit monitors temperature parameters and switches ventilation modes based on whether the temperature difference exceeds a predetermined threshold. This parameter-based control ensures that user comfort is maintained by only using normal ventilation mode when temperature conditions are favorable, while heat exchange ventilation is used when needed for comfort and efficiency.
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 minimizing internal pressure loss during normal ventilation modes when temperatures are within comfortable ranges, thereby saving energy without causing user discomfort, while efficiently using heat exchange ventilation when necessary.
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.