Recyclable Flexible HVAC Duct With Polymer Support Structure
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Solution Overview
Problem
Factory-made flexible HVAC ducts are not recyclable due to mixed materials in the duct liner and vapor barrier, leading to environmental issues and safety concerns, with metal helices causing deformation and injury during handling and installation.
Innovation Solution
A flexible HVAC duct design featuring a duct liner and vapor barrier made from compatible polymer materials, allowing for recycling together, and a polymer support structure that replaces metal helices to prevent deformation and injury.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal helices are used to support the duct liner, then structural strength is improved, but deformation and injury hazards occur during handling and installation
Solution Approach 1:
The patent replaces metal helices with a polymer support structure consisting of a polymer scrim layer integrated with the polymer film layers. This substitution eliminates the mechanical deformation and injury hazards associated with metal helices while maintaining structural support through the distributed reinforcement of the polymer scrim throughout the duct wall construction.
2Reliability
If mixed materials are used in duct liner and vapor barrier, then performance requirements are met, but recyclability is prevented
Solution Approach 1:
The patent employs homogeneous polymer materials throughout the duct construction, using the same polymer type for both the duct liner and vapor barrier components. This material uniformity allows the entire duct assembly to be recycled together as a single material stream, eliminating the need to separate different materials while still meeting all performance requirements through proper polymer selection and formulation.
3Reliability
If factory-made flexible ducts are constructed with multiple material layers, then safety and performance criteria are met, but recycling becomes economically unfeasible
Solution Approach 1:
The patent constructs the entire duct assembly using homogeneous polymer materials that can be processed together in a single recycling stream. The polymer film layers, polymer scrim reinforcement, and insulation materials are all compatible with the same recycling process, making recycling economically feasible while maintaining all required safety and performance characteristics through engineered polymer formulations.
Solution Approach 2:
The patent creates a composite polymer structure where polymer films are laminated with polymer scrim reinforcement to achieve the required mechanical strength and safety performance. This composite construction uses compatible polymer materials throughout that can be separated and recycled together, unlike traditional multi-material constructions that require complex separation processes.
4Ease of manufacture
If polymer materials are used instead of metal helices, then recyclability is improved, but packaging volume increases
Solution Approach 1:
The patent uses flexible polymer film layers with integrated polymer scrim support structures that can be efficiently folded and compacted for packaging. The flexibility of the polymer construction allows the duct to be collapsed into a compact form for shipping and storage, reducing packaging volume compared to rigid metal-helix constructions while maintaining the recyclability advantages of polymer materials.
Data Source
AI summary
A flexible HVAC duct is made with a support structure-containing duct liner, insulation layer, and reinforcing layer-containing vapor barrier. At least the duct liner and vapor barrier are constructed of polymer materials that enable them to be placed in the same recycling stream once the flexible HVAC duct is removed from its installed location. The insulation layer can also be made of a polymer material compatible with that used for the duct liner and vapor barrier so that the entire duct can be recycled once removed.