Optimized-Pitch Ducts for Uniform Heat Exchanger Cooling
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Solution Overview
Problem
Conventional ventilation devices for heat exchangers in motor vehicles suffer from inefficiencies, including large volume occupation, non-uniform air distribution, and partial masking of the heat exchanger by propeller fans, leading to inadequate cooling, especially when ambient air flow is sufficient.
Innovation Solution
A ventilation device with ducts having specific geometric profiles and air manifold configurations that distribute air flow uniformly across the heat exchanger, utilizing a Coanda effect to enhance air flow distribution and reduce the need for bulky propulsion systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a propeller fan is used to generate airflow through the heat exchanger, then airflow is created to enhance heat exchange, but the assembly occupies significant volume and creates non-uniform air distribution
Solution Approach 1:
The ventilation system is divided into multiple independent ducts (at least two) that are distributed across the heat exchanger surface. Each duct acts as an independent airflow generation unit, allowing the system to achieve uniform air distribution without requiring a single large propeller fan, thus reducing overall system volume while maintaining heat exchange efficiency.
Solution Approach 2:
Ducts serve as intermediary elements between the airflow source and the heat exchanger surface. These ducts are positioned at specific locations (including ends and corners) to mediate and distribute airflow uniformly across the entire heat exchanger, eliminating the need for a bulky central propeller fan while ensuring comprehensive air coverage.
2Productivity
If a propeller fan is positioned opposite the center of the heat transfer tube array, then airflow is generated, but the air distribution is not uniform across the entire heat exchanger surface
Solution Approach 1:
The single centralized airflow generation point is segmented into multiple distributed ducts positioned at different locations across the heat exchanger. This segmentation ensures that airflow is generated at multiple points simultaneously, creating uniform air distribution across the entire surface including ends and corners, rather than having a single non-uniform flow pattern from a central propeller fan.
Solution Approach 2:
Each duct is strategically positioned at specific locations (including ends and corners of the heat exchanger) to provide localized airflow generation. This local quality approach ensures that each region of the heat exchanger receives appropriate airflow, achieving overall uniform distribution that cannot be accomplished with a single centrally positioned propeller fan.
3Use of energy by stationary object
If the ventilation system is not required, then energy consumption is reduced, but the fan blades partially obscure the heat exchanger and limit heat exchange
Solution Approach 1:
The ventilation function is extracted from a single centralized propeller fan and distributed across multiple separate ducts. When ventilation is not required, these distributed ducts can be independently controlled or deactivated, allowing the heat exchanger to operate without obstruction from fan blades, thus maintaining full heat exchange capability while reducing energy consumption when needed.
Solution Approach 2:
The ventilation system employs dynamic control of multiple ducts, allowing selective activation or deactivation of individual ducts based on operational requirements. This dynamic approach enables the system to adapt to varying conditions, maintaining heat exchange capability when ventilation is needed while minimizing energy consumption and obstruction when ambient airflow is sufficient.
4Volume of stationary object
If ducts are positioned close together to reduce system volume, then compactness is achieved, but airflow induction is reduced
Solution Approach 1:
The pitch distance between adjacent ducts is optimized to a specific range (15-30 mm) that balances compactness with airflow induction. This parameter optimization ensures that ducts are positioned close together to minimize system volume while maintaining sufficient spacing to allow effective airflow induction and distribution, achieving both compactness and productivity simultaneously.
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 achieves a more efficient and compact ventilation system that ensures uniform cooling of the heat exchanger, even when ambient air flow is sufficient, by optimizing air flow distribution and reducing the required energy consumption.
Implementation Method 1
A ventilation device with ducts having specific geometric profiles and air manifold configurations that distribute air flow uniformly across the heat exchanger, utilizing a Coanda effect to enhance air flow distribution
Data Source
Figure 1~2
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Figure 6~7
AI summary
The invention relates to a ventilation device (2) for generating an air flow in the direction of a heat exchanger (1) of a motor vehicle, comprising pipes (8) through which an air flow is intended to pass, the pipes (8) being provided with at least one opening (40) for the passage of the air flow, separate from the ends thereof. The pipes (8) are aligned in a direction perpendicular to a direction of extension of the pipes (8), with a pitch of at least 15 mm and at most 30 mm.