Duct Acoustic Wave Modulator for HVAC Turbulence Noise
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Solution Overview
Problem
Heating and cooling systems, such as HVAC and refrigeration systems, generate significant acoustic noise due to air circulation, which existing technologies have not effectively mitigated despite efforts to design efficient fan systems.
Innovation Solution
Incorporating an acoustic wave modulator with fins into the duct assembly of these systems to reduce air turbulence and noise, combined with an active noise control device and acoustic filter media to further minimize noise levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fan speed is increased to improve airflow, then productivity is improved, but acoustic noise increases
Solution Approach 1:
An acoustic wave modulator is introduced as an intermediary component in the duct assembly between the fan and the environment. This modulator actively processes acoustic waves to reduce noise while allowing the fan to operate at higher speeds for improved airflow productivity.
Solution Approach 2:
The acoustic wave modulator utilizes mechanical vibration principles to counteract noise-generating vibrations from the fan. By introducing controlled vibrations through the modulator, the system reduces the harmful acoustic vibrations produced by high-speed fan operation.
2Object-generated harmful factors
If acoustic noise reduction components are added to the duct assembly, then acoustic noise is reduced, but device complexity increases
Solution Approach 1:
The acoustic wave modulator is designed to perform multiple functions within a single component: it reduces acoustic noise, maintains airflow efficiency, and can be integrated into existing duct assemblies without requiring complete system redesign. This multi-functionality reduces the need for multiple separate noise control components.
Solution Approach 2:
The modulator changes acoustic wave parameters (frequency, amplitude) to reduce noise. By adjusting these parameters dynamically, the system achieves effective noise reduction without requiring complex mechanical structures, thereby limiting the increase in device complexity.
3Object-generated harmful factors
If turbulence of air is reduced to minimize noise, then acoustic noise is reduced, but airflow efficiency may be impacted
Solution Approach 1:
The acoustic wave modulator dynamically adjusts its operation based on real-time acoustic conditions and airflow requirements. This dynamic control allows the system to reduce turbulence-induced noise while maintaining optimal airflow efficiency, as the modulator can adapt its turbulence reduction intensity based on system needs.
Solution Approach 2:
The modulator employs periodic action in its turbulence reduction mechanism, creating controlled periodic disturbances that cancel out chaotic turbulence. This periodic approach reduces noise-generating random turbulence while maintaining steady, efficient airflow patterns through the duct assembly.
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 reduces acoustic noise by up to 9 dB(A) through turbulence reduction and noise cancellation, maintaining airflow efficiency with minimal impact on fan performance.
Implementation Method 1
The acoustic wave modulator is configured to reduce turbulence of the air traveling through the duct assembly
Data Source
AI summary
A heating or cooling system comprising a powered fan held in a duct assembly. The powered fan generates acoustic noise when blowing air. The system also comprises an acoustic wave modulator held in the duct assembly. The acoustic wave modulator has one or more fins and is configured to reduce turbulence of the air traveling through the duct assembly.