Supply Air Terminal Nozzle Layout for Quiet High-Induction Ventilation
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Solution Overview
Problem
Conventional supply air terminal devices face challenges in reducing noise and draughts while achieving high induction and efficient air mixing, often requiring large air volumes and velocities that lead to discomfort.
Innovation Solution
The supply air terminal device features convergent spray nozzle-shaped airflow passages, adjustable regulating elements with level control means, and an air spreader to manage air flow direction and volume, ensuring high velocity with reduced noise and improved induction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large air volume is blown into the room from the supply air terminal device to achieve good ventilation and air mixing, then the ventilation effectiveness is improved, but it causes a feeling of discomfort due to blowing or draughts in the room
Solution Approach 1:
The air flow is divided into multiple separate air flows by providing several airflow passages instead of a single large opening. Each passage produces a smaller, more controlled air jet that mixes more gently with room air, reducing draughts while maintaining overall ventilation effectiveness through the combined effect of multiple streams.
Solution Approach 2:
The airflow passages are arranged in a specific three-dimensional configuration within the device housing, allowing air to be distributed from multiple spatial directions. This dimensional arrangement creates a more uniform and dispersed air distribution pattern in the room, reducing localized high-velocity jets that cause discomfort while maintaining good air mixing.
2Power
If the velocity of air leaving the airflow passages is increased to achieve high induction effect and good air mixing, then the induction power is improved, but it results in noise and draughts in the room
Solution Approach 1:
The single high-velocity air flow is segmented into multiple smaller air flows through separate passages. Each individual passage operates at lower velocity, reducing noise generation and draught effects, while the collective induction effect of multiple passages maintains or enhances overall air mixing performance.
Solution Approach 2:
Different airflow passages can have different geometries, orientations, and flow characteristics tailored to specific local requirements. This allows optimization of each passage's induction effect while controlling noise and draught at that specific location, with the overall system achieving good ventilation through the combination of locally optimized flows.
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 allows for high-velocity air flow with reduced noise and improved air mixing, enabling effective ventilation with smaller air volumes, minimizing draughts and enhancing comfort.
Implementation Method 1
The airflow passages (7a, 7b, 7c) are of convergent spray nozzle shape
Implementation Method 2
The airflow passages (7a, 7b, 7c) are of convergent spray nozzle shape
Implementation Method 3
The air leaving the airflow passages in a supply air terminal device causes negative pressure in the supply air terminal device. This negative pressure contributes to the creation of an induction effect whereby air may be drawn into the supply air terminal device from a room.
Implementation Method 4
part of the air in a room is drawn by induction through a temperature battery situated in the supply air terminal device. The room air passing through the battery is thereafter caused to mix in the supply air terminal device with cooler new air from a ventilation system.
Data Source
AI summary
A supply air terminal device (1) with a main chamber (2) configured to have air (3) flowing through it. The main chamber (2) comprises an inlet (4) for inflow of air (3) from a source disposed outside the supply air terminal device (1), and a bottom plate (5), which bottom plate (5) comprises air flow passages (7a, 7b) running through it for throughflow of at least part of the air (3) from an inside to an outside of the main chamber (2). An adjustable regulating element (10) is disposed in the supply air terminal device (1). The regulating element (10) comprises inside the main chamber (2) and at a distance from the airflow passages (7a, 7b) at least one beam element (12a, 12c). The beam element (12a, 12c) is connected to means (13a, 13b, 13c) with a respective direction from the beam element (12a, 12c) towards and through a respective airflow passage (7a, 7b). Each means (13a, 13b, 13c) has in its direction per unit length a narrowing cross-sectional area and is adjustable in the respective air flow passage (7a, 7b) so that a throughflow cross-section for the respective air flow passage (7a, 7b) can be adjusted between at least a first size of throughflow cross-section and at least a second size of throughflow cross-section.