Reflective Laminate Insulation Assembly for Thin HVAC Transition Boxes
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Solution Overview
Problem
Existing HVAC transition boxes face challenges in achieving increased resistance to thermal transfer while maintaining a standard size, as increased insulation thickness is required by new building codes, but this is difficult due to limited space and reduces R value when compressed.
Innovation Solution
The use of a combination of a mineral wool layer and a reflective laminate layer, where the reflective laminate layer is placed outside or inside the transition box, forming a composite with a combined thickness less than 2 inches to achieve an R value of at least 8, allowing for installation in smaller spaces while meeting thermal resistance standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If increased thickness of mineral wool insulation is used to increase R value, then thermal resistance is improved, but the insulation cannot fit within standard size transition box
Solution Approach 1:
The patent applies composite materials by combining mineral wool insulation with reflective insulation layers to create a multi-layer insulating assembly. This composite structure achieves higher thermal resistance (R value) in a thinner overall profile, allowing the insulation to fit within standard transition box dimensions while meeting increased thermal resistance requirements
Solution Approach 2:
The patent applies local quality by using different insulation materials in different locations and orientations. Mineral wool is placed in specific areas while reflective insulation is positioned in other areas, with each material optimized for its specific function and location within the transition box assembly
2Volume of moving object
If mineral wool insulation is compressed to fit inside transition box, then space constraint is resolved, but R value is reduced
Solution Approach 1:
The patent uses composite materials where reflective insulation layers are combined with mineral wool to achieve the required thermal resistance without compression. The reflective layers provide thermal resistance through radiation reflection rather than conduction, allowing the mineral wool to remain uncompressed and maintain its R value
Solution Approach 2:
The patent applies dimensionality change by adding reflective insulation layers that work in a different thermal resistance dimension (radiation reflection) rather than relying solely on increased thickness of conductive insulation. This allows achieving higher R values without increasing the physical thickness that would require compression
3Temperature
If size of register box is increased to accommodate insulation, then thermal resistance is improved, but cost increases and aesthetic appeal decreases
Solution Approach 1:
The patent uses composite insulation materials that provide high thermal resistance in a thin profile, eliminating the need to increase transition box size. This maintains standard box dimensions, keeping manufacturing costs down and aesthetic appeal intact while still achieving required R values
Solution Approach 2:
The patent applies parameter changes by transitioning from relying on thickness as the primary parameter for thermal resistance to using material composition and reflective properties. This allows achieving high R values with thin insulation layers, maintaining standard transition box sizes without increasing cost or compromising aesthetics
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 configuration enhances thermal resistance and noise reduction, allowing for installation in previously inaccessible locations while maintaining indoor air quality and reducing material costs, as the composite insulation provides an R value greater than the sum of its components.
Implementation Method 1
a reflective laminate layer having a second R value overlies the mineral wool layer
Implementation Method 2
A mineral wool layer having a first R value is adjacent the inside surface of the box
Data Source
AI summary
An insulated HVAC duct component such as a transition box includes a first insulation layer and a second, different insulation layer. The transition box includes at least four sidewalls and one of a top and a back wall, the transition box further including a first access port and a second access port, the first access port having a different cross section than the second access port, one of the access ports being spaced from a nearest sidewall by less than 2 inches. The first insulation layer is located along an inside surface of the box. The second different insulation layer overlies the first insulation layer, the second different insulation layer having an air impervious surface, wherein the combined thickness of the first insulation layer and the second different insulation layer is less than 2 inches.