Air Diffuser Mixing Chamber Design for Extended Throw Distance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional HVAC diffusers inefficiently mix conditioned and room air, and are unable to effectively distribute air over a desirable distance, leading to suboptimal ventilation and conditioning of spaces, particularly in large areas where peripheral regions do not require substantial conditioning.
Innovation Solution
An air diffuser with a mixing chamber, nozzles to accelerate conditioned air, a circulation inlet to induce room air into the mixing region, and a blank-off plate to control room air entry, combined with an oblique additional plate to enhance air flow velocity and throwing distance through the Coanda effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional diffusers are used to distribute conditioned air, then air distribution is provided, but mixing efficiency between conditioned air and room air is poor and throwing distance is insufficient
Solution Approach 1:
The diffuser is divided into distinct functional segments: a mixing region for air blending, a throwing region for air projection, a nozzle for accelerating conditioned air, and a blank-off plate for controlling room air intake. This segmentation allows each region to perform its specific function optimally, improving mixing efficiency and throwing distance while maintaining manageable structural complexity.
Solution Approach 2:
Different regions of the diffuser are designed with different properties: the mixing region has a first cross-sectional area optimized for air blending, the throwing region has a second cross-sectional area optimized for air projection, and the nozzle is positioned at specific locations to accelerate air flows. This local differentiation of properties enables simultaneous optimization of mixing efficiency and throwing performance.
2Length of moving object
If conditioned air is thrown a specified distance from traditional diffusers, then air distribution reach is achieved, but air flow velocity decreases substantially before reaching the target area
Solution Approach 1:
Room air is pre-induced into the mixing region through the circulation inlet and blank-off plate configuration before the air is projected into the throwing region. This preliminary mixing action ensures that the air entering the throwing region already has optimized velocity and composition, maintaining air flow velocity over the specified throwing distance.
Solution Approach 2:
The diffuser utilizes fluid dynamics principles where the nozzle accelerates conditioned air into the mixing region, creating a high-velocity jet that induces room air through the circulation inlet. The combined air flows are then projected through the throwing region, leveraging the momentum and pressure characteristics of the mixed air stream to achieve specified throwing distance while maintaining velocity.
3Productivity
If traditional diffusers mix conditioned air with recirculated room air, then ventilation is provided, but the mixing process is inefficient and requires additional cooling or heating coils
Solution Approach 1:
The diffuser design enables self-service mixing where the accelerated conditioned air from the nozzle automatically induces room air through the circulation inlet and blank-off plate arrangement. This self-induced mixing process eliminates the need for additional cooling or heating coils, reducing energy consumption while maintaining effective ventilation through the efficient blending of conditioned and room air in the mixing region.
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
Improves adiabatic mixing and air flow velocity, allowing for more efficient ventilation and conditioning of central areas within large spaces by recycling unconditioned room air without the need for additional cooling or heating coils, and optimizing the distribution of conditioned air.
Implementation Method 1
an oblique additional plate to enhance air flow velocity and throwing distance through the Coanda effect
Implementation Method 2
a blank-off plate configured to separate the mixing region from a room air intake fluidly coupled to the circulation inlet
Implementation Method 3
Improves adiabatic mixing and air flow velocity, allowing for more efficient ventilation and conditioning of central areas within large spaces
Data Source
AI summary
An air diffuser of a heating, ventilation, and/or air conditioning (HVAC) system includes a mixing chamber having a circulation inlet and a mixing region, a room air intake fluidly coupled with the circulation inlet and separated from the mixing region by a blank-off plate, and a nozzle. The nozzle is disposed adjacent to the circulation inlet and configured to accelerate a conditioned air flow into the mixing region such that unconditioned room air is induced by the conditioned air flow to enter the mixing region through the circulation inlet and from the room air intake.