Induction Ventilation Air Guide for Low-Draft Room Conditioning
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Solution Overview
Problem
Ventilation induction devices face challenges in maintaining a pleasant room climate due to high air speeds caused by high total volume flow, especially during reduced or no secondary air flow, leading to unpleasant climate perception and potential noise issues.
Innovation Solution
A displaceable air guiding element that narrows or widens the cross-section of the air guiding zone downstream of the induction device, influencing internal air pressure and controlling the secondary air volume flow, allowing for adjustable induction ratio without additional pressure loss or noise increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the total volume flow is reduced to lower air speed in the occupied zone, then the room climate becomes more pleasant, but the heating or cooling performance of the heat exchanger deteriorates
Solution Approach 1:
The air guiding element is made displaceable, allowing the system to dynamically adjust the cross-section of the air guiding zone based on operating conditions. This enables the system to optimize between air speed and heating/cooling performance by shifting the element to different positions depending on whether maximum comfort or maximum thermal performance is the priority.
Solution Approach 2:
The invention changes the geometric parameter of the air guiding zone cross-section by displacing the air guiding element. This parameter change directly influences the back pressure and secondary air volume flow, allowing continuous adjustment of the induction ratio to balance air speed comfort with heat exchanger performance.
2Speed
If the secondary air volume flow is reduced to lower total volume flow, then air speed in the occupied zone decreases, but the induction ratio deteriorates
Solution Approach 1:
The displaceable air guiding element provides dynamic control over the air guiding zone cross-section, enabling the system to adjust the secondary air volume flow and induction ratio according to actual operating needs. This dynamic adjustment capability allows the system to reduce air speed when comfort is prioritized while maintaining the ability to restore full induction performance when thermal performance is prioritized.
3Power
If an air guide element is added to improve secondary air flow, then heating or cooling capacity increases, but device complexity increases
Solution Approach 1:
The air guiding element is designed to perform multiple functions: it serves as both the injector device for improving secondary air flow and heat exchanger capacity, and simultaneously acts as a displacement mechanism for controlling the air guiding zone cross-section and back pressure. This multi-functionality eliminates the need for separate control components, reducing overall device complexity while maintaining enhanced thermal performance.
Solution Approach 2:
The invention merges the injector device and the air guiding zone control mechanism into a single integrated air guiding element. This consolidation reduces the number of parts and simplifies the overall structure, as the same component that enhances heating/cooling capacity also provides the means for dynamic flow control.
4Speed
If the air guiding element is made displaceable to control secondary air flow, then air speed in occupied zone is reduced, but additional pressure loss occurs
Solution Approach 1:
The invention changes the cross-sectional parameter of the air guiding zone by displacing the air guiding element, which aerodynamically influences the back pressure. This parameter change allows control of secondary air volume flow and induction ratio while minimizing energy losses through optimized aerodynamic design of the displacement mechanism.
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 solution effectively reduces air speed in the occupied zone by controlling secondary air flow, maintaining a pleasant climate and quiet operation across various control states, with no additional pressure loss or performance reduction during normal operation.
Implementation Method 1
The primary air supplied to the induction device generates an induction which draws in secondary air
Implementation Method 2
The secondary air drawn in passes through a heat exchanger and is heated or cooled there
Implementation Method 3
The air pressure inside the device, i.e. the back pressure mentioned, is influenced in an aerodynamic manner by the displaceably arranged air guiding element
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The ventilation-enabled induction machine (1) has an induction device (22) stored with primary air, a heat exchanger (18) flowed-through by secondary air based on the induction effect of the induction device and an injector device (10) designed as an air guide element (11). The air guide element is displaceably arranged for narrowing or widening the cross section of an air guiding zone (26) located downstream to the induction device. An independent claim is included for a method for venting or air conditioning of a room of a building.