Hybrid Room Ventilation with Mixed Passive and Active Airflow
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Solution Overview
Problem
Conventional room ventilation systems face challenges in efficiently ventilating rooms while minimizing energy use and maintaining comfort, especially at lower outside temperatures where passive window ventilation becomes uncomfortable due to cold air intake, and existing solutions often require motor-driven window closers or disrupt internal pressure.
Innovation Solution
A hybrid room ventilation device with active and passive elements integrated into the same outer wall, allowing for controlled interaction between both systems, including motorized and manual operation options, and a control device that balances ventilation modes based on temperature and wind pressure to ensure comfortable and energy-efficient air exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If passive window ventilation is used at lower outside temperatures, then energy consumption is reduced, but comfort deteriorates due to cold air intake
Solution Approach 1:
The patent combines passive window ventilation with active ventilation elements (external wall device) into a hybrid system. The control device coordinates both systems to operate simultaneously or alternatively, allowing the benefits of passive ventilation (energy savings) to be extended to lower temperatures while the active element compensates for comfort issues by providing warmed air.
Solution Approach 2:
The control device monitors outside temperature and adjusts the operation mode of the ventilation system. At lower temperatures, it transitions from purely passive window ventilation to a hybrid mode where the active external wall device supplements the ventilation, effectively changing the system parameters to maintain comfort while preserving energy efficiency.
2Extent of automation
If motor-driven window closers are installed for hybrid ventilation control, then ventilation mode switching is automated, but device complexity increases
Solution Approach 1:
The control device acts as an intermediary that manages the hybrid ventilation system without requiring motor-driven window closers. It coordinates the passive window ventilation and active external wall device based on sensor inputs, providing automated control while avoiding the complexity of motorizing the windows themselves.
3Object-affected harmful factors
If active ventilation is used exclusively, then room air conditioning is maintained, but energy consumption increases
Solution Approach 1:
The hybrid ventilation system applies partial active ventilation rather than full active ventilation. The external wall device provides supplemental ventilation capacity when needed, allowing the system to maintain room air conditioning through a combination of passive and active elements, thereby reducing overall energy consumption compared to exclusive active 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
Enables extended energy-saving window ventilation at lower temperatures by mixing fresh air streams for temperature equalization and switches to active ventilation when necessary, reducing energy consumption and allowing retrofitting without motor-driven window closers, while maintaining room comfort and air quality.
Implementation Method 1
the actively and passively supplied fresh air streams can mix so that there is a certain temperature equalization and the supply air is no longer perceived as uncomfortable
Implementation Method 2
The exchange of air then takes place essentially convectively or turbulently due to the influence of the wind
Data Source
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AI summary
The device has a control device (34) for controlling an active ventilation element and passive ventilation elements such as roof light (16) and a hopper window (18). The active ventilation element is designed as an outer wall device (26) and positioned below the passive ventilation element at the outer wall. The active ventilation element sucks outside air by an outside air opening in the outer wall and delivers as supply air in the room. The control device comprises an operating mode in which the active and passive ventilation elements are simultaneously operated.