Air Diffuser Dump Mechanism for Switchable Ceiling and Downward Flow
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Solution Overview
Problem
Conventional air diffusers in HVAC systems often direct hot air to accumulate under the ceiling, failing to rapidly heat a cold room effectively, as they rely on the Coandă effect to distribute air upwards, rather than allowing it to flow downward.
Innovation Solution
An air diffuser with a volume control mechanism and a dump mechanism that allows selective redirection of air flow from an upward diffusion direction to a downward direction using pivotally supported blades or elements, controlled by a stepper motor, enabling volumetric control and redirection of air flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional diffuser uses the Coandă effect to direct air along the ceiling, then air distribution is improved, but heating efficiency deteriorates because hot air accumulates under the ceiling instead of flowing downward
Solution Approach 1:
The diffuser incorporates movable dump elements that can dynamically change position between a first position (allowing Coandă effect for air distribution) and a second position (redirecting air downward for heating). This dynamic adjustment allows the system to adapt between different operational modes - normal air distribution versus rapid heating mode - resolving the contradiction between ease of operation and heating efficiency
Solution Approach 2:
The system changes the flow direction parameter by moving the dump elements between positions. When dump elements are in the first position, air flows along the ceiling; when moved to the second position, the flow direction changes to downward. This parameter change enables the system to switch between distribution mode and heating mode, addressing the contradiction between air distribution quality and heating efficiency
2Adaptability or versatility
If a diffuser provides selective air flow control (diffusion or direct flow), then versatility is improved, but device complexity increases due to additional mechanisms
Solution Approach 1:
The diffuser body is segmented into multiple flow passages (first flow passage for diffusion, second flow passage for direct flow) with movable dump elements that can selectively open or close each passage. This segmentation allows independent control of different air flow paths, providing versatility while keeping each individual passage relatively simple in structure
Solution Approach 2:
The diffuser is designed with multi-functionality to provide both diffusion mode (using Coandă effect) and direct flow mode (for rapid heating or air curtains) through the same device structure. The volume control mechanism and dump elements work together to achieve multiple functions, improving versatility without requiring entirely separate systems for each mode
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 efficient and cost-effective control of air flow direction, allowing air to flow downward for rapid heating or air curtain creation, while maintaining volumetric control, thus addressing the limitations of conventional diffusers in heating cold rooms.
Implementation Method 1
air diffusers are also often used to distribute air evenly in desired directions as it enters the room—especially to cause a jet of air from the diffuser to attach to a ceiling, taking advantage of the Coandă effect
Data Source
AI summary
A flow of air through a diffuser (10) is controlled by controlling the volumetric flow rate of the flow of air in a control passage, directing the air through a diffusion flow passage, and then either diffusing the air in a first, normal direction, or occasionally diffusing it in a second direction, to dump the air into a room. The air is dumped by operating a dump mechanism (26) to displace a dump element (28,46) from a first diffusion position in which the flow of air is directed in the first diffusion direction, along a ceiling, to a second diffusion position in which the dump element (28,46) redirects the flow of air to dump it.