Inflatable Air-Jacket Duct Insulation for Higher HVAC R-Value
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Solution Overview
Problem
Existing HVAC ducts face challenges in achieving high R-values without increasing costs, as they require additional insulating materials, which can pose safety and environmental concerns.
Innovation Solution
An insulated duct design featuring an inflatable air jacket that uses the flowing air to create an insulating space, potentially combined with low emissivity materials, to enhance thermal resistance without the need for additional insulating materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If additional insulating materials are added to increase R-value, then thermal resistance is improved, but cost and device complexity increase
Solution Approach 1:
The patent uses pneumatic pressure from the HVAC system to inflate an air jacket surrounding the duct, creating an insulating air layer. The air jacket expands when pressurized air is supplied through inlet openings, forming a protective insulating barrier without requiring additional solid insulating materials.
Solution Approach 2:
The patent utilizes trapped air within the air jacket as an inert insulating medium. The air layer between the duct surface and the external environment provides thermal resistance, leveraging the insulating properties of stationary air to reduce heat transfer without adding complex insulation layers.
2Temperature
If additional insulating materials are added to increase R-value, then thermal resistance is improved, but safety and environmental risks increase
Solution Approach 1:
The air jacket system replaces potentially hazardous insulating materials with pressurized air as the insulating medium. This eliminates concerns about fiberglass exposure, fire hazards from additional insulation layers, and environmental disposal issues associated with traditional insulating materials.
Solution Approach 2:
The HVAC system's own pressurized air supply is utilized to inflate and maintain the air jacket, eliminating the need for separate insulation materials. The system uses its existing operational resources (pressurized air) to provide the insulating function, reducing material requirements and associated safety/environmental concerns.
3Temperature
If air is used to inflate the jacket, then additional insulating capability is provided, but device complexity increases
Solution Approach 1:
The air jacket serves multiple functions: it provides structural support to the duct, acts as an insulating barrier, and can be inflated using the existing HVAC pressurized air supply. By making the air jacket multi-functional, the patent avoids adding dedicated inflation systems while still achieving the insulating effect.
Solution Approach 2:
The air jacket is designed to be inflated and maintained using the pressurized air already present in the HVAC system. The system uses its own operational air supply to maintain the air jacket, eliminating the need for separate compression systems, tanks, or complex inflation mechanisms.
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 design efficiently and cost-effectively increases the R-value of HVAC ducts, allowing a duct with an R-6 value to be upgraded to R-8, while minimizing environmental impact and safety risks associated with extra insulation.
Implementation Method 1
fluid from the channel or the source of fluid other than the channel inflates the inflatable space to form a static pressure condition
Implementation Method 2
creates an insulating layer for the duct segment
Data Source
AI summary
An insulated duct includes an inflatable jacket surround the duct. The jacket is inflated, preferably with air traveling in the duct, to create a static condition in the air space formed by the jacket to provide additional insulation for the duct. When the jacket is combined with additional insulation and low emissivity material, the R value of the duct can be increased in a more efficient manner from manufacturing and cost viewpoints.