Perforated Air Distribution Chamber for Uniform Low-Noise Ventilation

Solution Overview

Problem

Existing air distribution devices in building ventilation systems face challenges in achieving uniform air distribution while minimizing noise levels, particularly in displacement ventilation systems where low-velocity air distribution devices are placed near occupants.

Innovation Solution

The air distribution device incorporates an air distribution chamber with a perforated inner wall, an impermeable outer wall, and a pressure equalization chamber, featuring throttling plates or meshes to regulate airflow and reduce noise, ensuring uniform air distribution by equalizing ventilation air pressure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If air distribution devices are used to distribute air uniformly in the room space, then air distribution uniformity is improved, but noise levels increase

Engineering Contradiction:

Improveair distribution uniformityVSAvoidnoise levels

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The air distribution device is divided into multiple functional chambers: a first air distribution chamber with a first array of openings, a second air distribution chamber with a second array of openings, and an intermediate chamber positioned between them. This segmentation allows different zones to handle different aspects of air distribution, enabling uniform air delivery while controlling noise through the intermediate chamber's acoustic properties

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

An intermediate chamber is positioned between the first and second air distribution chambers, acting as a mediator that receives air from the first chamber and delivers it to the second chamber. This intermediate structure serves as an acoustic buffer that reduces noise transmission while maintaining the functional air distribution pathway, thus resolving the contradiction between uniform air delivery and noise control

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If supply air is supplied at floor level close to occupants in displacement ventilation systems, then indoor air quality is improved, but noise levels become unacceptable

Engineering Contradiction:

Improveindoor air qualityVSAvoidnoise levels

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The air distribution device is divided into multiple functional chambers: a first air distribution chamber with a first array of openings, a second air distribution chamber with a second array of openings, and an intermediate chamber positioned between them. This segmentation allows different zones to handle different aspects of air distribution, enabling uniform air delivery while controlling noise through the intermediate chamber's acoustic properties

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

An intermediate chamber is positioned between the first and second air distribution chambers, acting as a mediator that receives air from the first chamber and delivers it to the second chamber. This intermediate structure serves as an acoustic buffer that reduces noise transmission while maintaining the functional air distribution pathway, thus resolving the contradiction between uniform air delivery and noise control

Inventive Principle:

Principle #24Intermediary (Mediator)

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 effectively enhances air distribution uniformity and reduces noise levels, providing improved indoor air quality and occupant comfort by managing airflow velocity and pressure.

Implementation Method 1

The air distribution chamber further comprises at least one perforated throttling plate or throttling mesh perpendicular to the inner perforated wall and perpendicular to the flow of ventilation air from the air inlet into the air distribution chamber

Methodology Applied

Scientific EffectThrottling: Pressure Drop

Implementation Method 2

a perforation-free area of the outer perforated wall is smaller than the perforation free area of the inner perforated wall in order to equalize ventilation air pressure in the equalization chamber and to provide a uniform flow of air through the outer perforated wall

Methodology Applied

Scientific EffectPressure equalization: Pressure Gradient

Implementation Method 3

Heated air rises upwards due to its lower density and is collected via the outlets to the exhaust air ducts

Methodology Applied

Scientific EffectBuoyancy: Archimedes' Principle (Buoyancy)

Data Source

PatentEP2896905B1Air distribution device

Publication Date: 2018.08.15 HALTON OY

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AI summary

The invention is an air distribution device. The air distribution device an air distribution chamber arranged to receive a flow of ventilation air from the air outlet. The air distribution chamber further comprises one or more perforated throttling plates or meshes perpendicular to the inner perforated wall and perpendicular to the flow of ventilation air from the air outlet into the air distribution chamber. The air distribution device also comprises a pressure equalization chamber formed between an inner air permeable front plate of the air distribution chamber and an outer front plate. Perforation-free area of the outer perforated front plate is smaller than the perforation free area of the inner perforated front plate in order to equalize ventilation air pressure in the equalization chamber and to provide a uniform flow of air through the outer front plate.