Aerodynamic device
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Solution Overview
Problem
Conventional ventilation devices have limited efficiency due to predetermined dimensions, resulting in a ratio of the tangential fan's impeller diameter to the housing height of 0.4 to 0.45, which restricts the achievable performance and requires a large construction depth, making them unsuitable for underfloor or underfloor facade applications.
Innovation Solution
The tangential fan and heat exchanger are arranged laterally adjacent to each other with a ratio of the impeller diameter to the housing height of ≥0.5, allowing for a higher impeller diameter compared to the housing height, and the heat exchanger is angled to create an air flow chamber that widens towards the impeller, enhancing airflow and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the heat exchanger is arranged horizontally with a large surface area, then the overall depth is large, but the overall height is reduced
Solution Approach 1:
The heat exchanger is arranged at an angle (inclined arrangement) rather than purely horizontally or vertically, changing the spatial dimension of heat exchange. This angular arrangement allows the air flow chamber to expand towards the impeller while maintaining both compact height and depth dimensions, resolving the contradiction between overall depth and overall height.
2Productivity
If the impeller diameter is increased to improve fan performance, then the ratio of impeller diameter to housing height increases, but the housing dimensions are constrained
Solution Approach 1:
The patent changes the geometric parameters by arranging the heat exchanger at an angle, which allows the air flow chamber to expand towards the impeller. This parameter change enables a larger impeller diameter relative to housing height (ratio ≥0.5) without proportionally increasing the overall housing height, thus improving fan performance while constraining housing dimensions.
3Productivity
If the heat exchanger is arranged at an angle to create an expanding air flow chamber, then the airflow efficiency is improved, but the structural complexity increases
Solution Approach 1:
The heat exchanger arrangement merges the heat exchange function with the airflow channel formation. The angled heat exchanger structure simultaneously performs heat exchange and defines the expanding air flow chamber geometry, eliminating the need for separate airflow channel components and reducing overall structural complexity despite the improved airflow 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
This configuration results in a ventilation device with a small overall depth and high efficiency, enabling its use as an underfloor or underfloor facade unit with improved performance compared to conventional devices, while maintaining a compact footprint.
Implementation Method 1
The drawn-in air passes through a heat exchanger, which is tempered with hot or cold water
Implementation Method 2
The ventilation device draws in room air from a room by means of the tangential fan
Data Source
Figure 1
AI summary
The invention relates to a ventilation device (1), in particular a recirculation device (2), with a housing (9) having an air inlet zone (21) and an air outlet zone (22), in which an impeller (37) provided with a vortex generator (40) having cross-flow fan (24) and a heat exchanger (23) are arranged. It is provided that the tangential fan (24) and heat exchanger (23) are arranged laterally adjacent to one another in such a way that an end face (31) of the heat exchanger (23) is assigned to the tangential fan (24) and that the ratio of the diameter (D) of the impeller (37) of the tangential fan (24) to the height (H) of the housing (9) is ≥ 0.5, preferably ≥ 0.6.