Floor Ventilation Using Dual-Impulse Air Stratification for Comfort
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Solution Overview
Problem
Existing methods for ventilating, heating, and cooling rooms do not consistently create a pleasant indoor climate, as they fail to effectively stratify air to enhance comfort.
Innovation Solution
The method involves using primary and secondary air flows with distinct impulse velocities, where primary air is introduced with low impulse for displacement ventilation and secondary air with high impulse to induce room air, creating an air stratification that results in a comfortable indoor climate. The secondary air, after being heat-treated, enters the room with a strong impulse, inducing room air into its flow and forming a mixed displacement ventilation that reduces impulse as it overlaps with primary air, leading to a pleasant stratified air layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If secondary air is introduced with high impulse to induce room air, then air mixing and ventilation efficiency improve, but air stratification and comfort may be compromised
Solution Approach 1:
The ventilation system is divided into two independent air supply systems: primary air outlets introducing outside air with low impulse, and secondary air outlets introducing pre-heated/pre-cooled air with high impulse. This segmentation allows each system to perform its specific function without interfering with the other, enabling both effective air mixing and stable stratification to coexist.
Solution Approach 2:
The system changes the impulse parameter of secondary air by pre-heating or pre-cooling it before introduction. This parameter modification enables the secondary air to induce room air effectively through buoyancy-driven flow while maintaining control over the mixing intensity, thus resolving the contradiction between ventilation efficiency and stratification stability.
2Stability of the object's composition
If primary air is introduced with low impulse for displacement ventilation, then air stratification is maintained, but air mixing and ventilation effectiveness are reduced
Solution Approach 1:
The ventilation system is divided into two independent air supply systems: primary air outlets introducing outside air with low impulse, and secondary air outlets introducing pre-heated/pre-cooled air with high impulse. This segmentation allows each system to perform its specific function without interfering with the other, enabling both effective air mixing and stable stratification to coexist.
Solution Approach 2:
The system merges two different ventilation mechanisms (displacement ventilation from primary air and mixed displacement ventilation from secondary air) into a single integrated system. The primary air maintains stratification while the secondary air provides effective mixing, and their combined effect achieves both goals simultaneously.
3Stability of the object's composition
If secondary air impulse is reduced to maintain stratification, then air layer stability improves, but induction of room air and mixing efficiency decrease
Solution Approach 1:
The secondary air is pre-heated or pre-cooled before being introduced into the room. This preliminary thermal treatment creates density differences that enhance the induction effect, allowing the secondary air to effectively draw in and mix with room air even when its impulse is reduced, thus maintaining both stratification stability and mixing efficiency.
4Stability of the object's composition
If only displacement ventilation is used, then air stratification is achieved, but temperature treatment and comfort consistency are insufficient
Solution Approach 1:
The system merges two different ventilation mechanisms (displacement ventilation from primary air and mixed displacement ventilation from secondary air) into a single integrated system. The primary air maintains stratification while the secondary air provides effective mixing, and their combined effect achieves both goals simultaneously.
Solution Approach 2:
The system changes the impulse parameter of secondary air by pre-heating or pre-cooling it before introduction. This parameter modification enables the secondary air to induce room air effectively through buoyancy-driven flow while maintaining control over the mixing intensity, thus resolving the contradiction between ventilation efficiency and stratification stability.
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 creates a stratified air layer in the occupied zone of the room, providing a consistently pleasant indoor climate by ensuring that the air mixture is both temperature-treated and includes induced room air, enhancing comfort and efficiency.
Implementation Method 1
the flow speed/its impulse is so great that room air is induced laterally in the air flow becomes
Implementation Method 2
passed through a heat exchanger which serves to heat or cool the mixed air
Data Source
Figure 1~2
Figure 3~4
AI summary
The method involves discharging temperature-based or temperature-unconcerned primary air (11) perpendicularly or diagonally upward as source air (34), at a floor area an area (1). The primary air is discharged perpendicularly or diagonally upward adjacent with temperature-based or temperature-unconcerned secondary air (25) in the floor area as mixing source air (33). The mixing source air is placed or moved in a horizontal flow via the former source air, to form an air bedding (33').