Pressed-Fibre Air Guide for Quiet Compact Wall Ventilation
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Solution Overview
Problem
Reversible-flow ventilation units face challenges in being silent, energy-efficient, and compact enough for retrofit installations in existing buildings, while also needing to be cost-effective, which can conflict with each other in design considerations.
Innovation Solution
The indoor air exchange assembly features a pressed-fibre air guide with a blind airflow channel and a half-dome airflow deflector, combined with a developable surface distal side, which reduces noise and turbulence, and is made with mineral wool impregnated with a binding agent, along with a liner fabric for stabilization and sound reduction, allowing for a silent and energy-efficient design that fits compact spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional ventilation system is installed to achieve energy recovery, then energy efficiency is improved, but the system becomes large and complicated, making it unsuitable for compact installations and retrofits in old buildings
Solution Approach 1:
The patent divides the ventilation system into separate modular units: an outdoor unit and an indoor unit, connected by a simple duct. This segmentation allows the energy recovery function to be achieved without a single large complex system, enabling compact installation in existing buildings while maintaining energy efficiency through the modular architecture.
Solution Approach 2:
The patent reconfigures the airflow path to extend along the wall plane rather than through a centralized horizontal duct system. The indoor unit's airflow channel extends parallel to the wall from the duct interface to the ventilation orifice, creating a compact vertical/wall-parallel arrangement that fits limited retrofit spaces while maintaining energy recovery functionality.
2Adaptability or versatility
If the ventilation unit is made compact for retrofit installation, then adaptability to existing buildings is improved, but noise transmission from the air duct and airflow channel increases
Solution Approach 1:
The patent employs a composite construction for the indoor unit's cover, combining a pressed-fibre air guide (providing acoustic absorption and airflow guidance) with a separate cover structure. This composite design achieves effective noise reduction within a compact form factor, allowing retrofit installation while minimizing noise transmission to the interior space.
Solution Approach 2:
The pressed-fibre air guide uses porous pressed-fibre material that absorbs and dampens noise from the airflow channel and air duct while still allowing efficient airflow. This porous structure provides acoustic attenuation within the compact indoor unit, reducing noise transmission without compromising the adaptability for retrofit installation.
3Device complexity
If a simple straight airflow path is used, then device complexity is reduced, but noise from the air duct and airflow channel increases
Solution Approach 1:
The patent incorporates curved surfaces in the airflow channel design, including a half-dome airflow deflector at the duct interface and a developable surface for the distal side of the air guide. These curved geometries guide airflow smoothly through the simple straight path, reducing turbulence and noise generation while maintaining low device complexity suitable for retrofit applications.
4Adaptability or versatility
If the airflow channel is made compact to fit limited spaces, then adaptability to existing buildings is improved, but airflow efficiency and turbulence are compromised
Solution Approach 1:
The patent extends the airflow channel along the wall plane in a longitudinal direction rather than using a compact horizontal arrangement. This dimensional reconfiguration allows the channel to achieve sufficient length for efficient airflow while maintaining a compact footprint that fits within limited retrofit spaces, preserving airflow efficiency without compromising adaptability.
Solution Approach 2:
The curved half-dome deflector and developable surface geometry optimize airflow transitions within the compact channel, reducing turbulence and maintaining efficient airflow despite the constrained dimensions required for retrofit installation.
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 minimizes noise leakage and maximizes airflow efficiency while maintaining a compact and aesthetically pleasing design, suitable for retrofit installations in existing buildings, balancing silence, energy efficiency, and cost considerations.
Implementation Method 1
The pressed-fibre air guide may be configured to dampen noise from an air flow channel defined therein
Implementation Method 2
heating the mould press to bind the binding agent, thereby joining the compressed sheet of fibre material with the liner fabric
Data Source
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AI summary
An indoor air exchange assembly for a reversible-flow ventilation unit comprises a wall mount (28) configured to be attached to an indoor wall face extending in a wall plane, the wall mount (28) comprising an air duct interface (32a); and a cover configured to be held by the wall mount (28), the cover comprising a pressed-fibre air guide (40) having a proximal side configured to face said indoor wall face (30) and a distal side configured to face away from said indoor wall face (30), the proximal side of the pressed-fibre air guide (40) defining an elongate airflow channel (52) extending parallel to the wall plane (P) from the air duct interface (32a) to a ventilation orifice (54).