Modular Fan Unit Design for Efficiency and Acoustic Optimization
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Solution Overview
Problem
Current fan technologies for building ventilation systems face challenges in selectively optimizing efficiency and acoustic performance, often requiring compromises between efficiency and noise reduction, and cannot efficiently serve both supply and return fans with a single fan wheel diameter.
Innovation Solution
The solution involves a modular fan unit design that allows for the selection of different fan wheel diameters and the use of acoustic treatment and fixed vanes to tailor performance to specific requirements, enabling optimization of efficiency and acoustic performance by selecting from a range of fan sizes that fit within a standard housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single fan wheel diameter is used for both supply and return fans, then manufacturing and installation are simplified, but efficiency is compromised for one or both applications
Solution Approach 1:
The patent applies universality by designing a standardized housing that can accommodate multiple fan wheel diameters (e.g., 24-inch, 27-inch, 30-inch fans in a 48-inch housing). This allows the same housing design to serve both supply and return fan applications with different efficiency requirements, maintaining manufacturing simplicity while enabling optimal fan selection for each specific application's performance needs.
2Object-affected harmful factors
If noise mitigation is achieved through external sound traps, then acoustic performance is improved, but air handler length and cost increase
Solution Approach 1:
The patent merges the acoustic treatment function with the housing structure by integrating sound-absorbing material directly into the housing interior surfaces. This combination eliminates the need for separate external sound traps, achieving noise mitigation while maintaining compact air handler dimensions and reducing overall system cost.
3Productivity
If fan size is increased to meet flow requirements, then flow capacity is improved, but acoustic performance deteriorates
Solution Approach 1:
The patent applies local quality by selectively applying sound-absorbing material to specific areas within the housing where noise generation occurs, rather than uniformly treating the entire housing. This targeted approach allows larger fans to be used for increased flow capacity while mitigating noise at the source locations, achieving both productivity and acoustic performance goals.
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 approach maximizes efficiency and reduces noise, allows for uniform installation designs, and reduces manufacturing complexity and costs, while enabling in-situ adjustments to meet specific performance goals without changing the housing, thereby improving overall air handling system performance.
Implementation Method 1
a fan wheel and motor positioned inside the housing, the fan wheel being one of several different sized fan wheels that can be installed in the housing
Implementation Method 2
acoustic treatment and fixed vanes to tailor performance to specific requirements
Data Source
AI summary
Particular embodiments of the inventive technology present a method for optimizing fan performance by, e.g., adjusting fan efficiency and/or acoustics to match, or more closely match, system design requirements or preferences. Embodiments may involve the selection of a size of centrifugal fan 18 from the plurality that can fit inside a certain housing, forming a fan unit that provides an annular output 19; such selection may be made to achieve certain performance goals. Add-on appurtenances such as one or more of, e.g., an annular housing extension 10, fixed vanes 12, and acoustic treatment 8, may be used to tailor the fan unit to meet system requirements, e.g., regarding efficiency, acoustic/sonic performance (e.g., noise generated by the fan), and/or static efficiency.